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UniProtKB - Q15418 (KS6A1_HUMAN)

Entry version 221 (23 Feb 2022)
Sequence version 2 (16 Apr 2002)
Previous versions | rss
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Protein

Ribosomal protein S6 kinase alpha-1

Gene

RPS6KA1

Organism
Homo sapiens (Human)
Status
Reviewed-Annotation score:

Annotation score:5 out of 5

<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>-Experimental evidence at protein leveli <p>This indicates the type of evidence that supports the existence of the protein. Note that the 'protein existence' evidence does not give information on the accuracy or correctness of the sequence(s) displayed.<p><a href='/help/protein_existence' target='_top'>More...</a></p>

<p>This section provides any useful information about the protein, mostly biological knowledge.<p><a href='/help/function_section' target='_top'>More...</a></p>Functioni

Serine/threonine-protein kinase that acts downstream of ERK (MAPK1/ERK2 and MAPK3/ERK1) signaling and mediates mitogenic and stress-induced activation of the transcription factors CREB1, ETV1/ER81 and NR4A1/NUR77, regulates translation through RPS6 and EIF4B phosphorylation, and mediates cellular proliferation, survival, and differentiation by modulating mTOR signaling and repressing pro-apoptotic function of BAD and DAPK1. In fibroblast, is required for EGF-stimulated phosphorylation of CREB1, which results in the subsequent transcriptional activation of several immediate-early genes. In response to mitogenic stimulation (EGF and PMA), phosphorylates and activates NR4A1/NUR77 and ETV1/ER81 transcription factors and the cofactor CREBBP. Upon insulin-derived signal, acts indirectly on the transcription regulation of several genes by phosphorylating GSK3B at 'Ser-9' and inhibiting its activity. Phosphorylates RPS6 in response to serum or EGF via an mTOR-independent mechanism and promotes translation initiation by facilitating assembly of the pre-initiation complex. In response to insulin, phosphorylates EIF4B, enhancing EIF4B affinity for the EIF3 complex and stimulating cap-dependent translation. Is involved in the mTOR nutrient-sensing pathway by directly phosphorylating TSC2 at 'Ser-1798', which potently inhibits TSC2 ability to suppress mTOR signaling, and mediates phosphorylation of RPTOR, which regulates mTORC1 activity and may promote rapamycin-sensitive signaling independently of the PI3K/AKT pathway. Mediates cell survival by phosphorylating the pro-apoptotic proteins BAD and DAPK1 and suppressing their pro-apoptotic function. Promotes the survival of hepatic stellate cells by phosphorylating CEBPB in response to the hepatotoxin carbon tetrachloride (CCl4). Mediates induction of hepatocyte prolifration by TGFA through phosphorylation of CEBPB (By similarity).

Is involved in cell cycle regulation by phosphorylating the CDK inhibitor CDKN1B, which promotes CDKN1B association with 14-3-3 proteins and prevents its translocation to the nucleus and inhibition of G1 progression. Phosphorylates EPHA2 at 'Ser-897', the RPS6KA-EPHA2 signaling pathway controls cell migration (PubMed:26158630).

By similarity12 Publications

(Microbial infection) Promotes the late transcription and translation of viral lytic genes during Kaposi's sarcoma-associated herpesvirus/HHV-8 infection, when constitutively activated.

1 Publication

<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section describes the catalytic activity of an enzyme, i.e. a chemical reaction that the enzyme catalyzes.<p><a href='/help/catalytic_activity' target='_top'>More...</a></p>Catalytic activityi

<p>This subsection of the 'Function' section provides information relevant to cofactors. A cofactor is any non-protein substance required for a protein to be catalytically active. Some cofactors are inorganic, such as the metal atoms zinc, iron, and copper in various oxidation states. Others, such as most vitamins, are organic.<p><a href='/help/cofactor' target='_top'>More...</a></p>Cofactori

Mg2+

<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section describes regulatory mechanisms for enzymes, transporters or microbial transcription factors, and reports the components which regulate (by activation or inhibition) the reaction.<p><a href='/help/activity_regulation' target='_top'>More...</a></p>Activity regulationi

Upon extracellular signal or mitogen stimulation, phosphorylated at Thr-573 in the C-terminal kinase domain (CTKD) by MAPK1/ERK2 and MAPK3/ERK1. The activated CTKD then autophosphorylates Ser-380, allowing binding of PDPK1, which in turn phosphorylates Ser-221 in the N-terminal kinase domain (NTDK) leading to the full activation of the protein and subsequent phosphorylation of the substrates by the NTKD.2 Publications

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section describes the interaction between a single amino acid and another chemical entity. Priority is given to the annotation of physiological ligands.<p><a href='/help/binding' target='_top'>More...</a></p>Binding sitei94ATPPROSITE-ProRule annotation1
<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section is used for enzymes and indicates the residues directly involved in catalysis.<p><a href='/help/act_site' target='_top'>More...</a></p>Active sitei187Proton acceptorBy similarity1
Binding sitei447ATPPROSITE-ProRule annotation1
Active sitei535Proton acceptorBy similarity1

Regions

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section describes a region in the protein which binds nucleotide phosphates. It always involves more than one amino acid and includes all residues involved in nucleotide-binding.<p><a href='/help/np_bind' target='_top'>More...</a></p>Nucleotide bindingi68 – 76ATPPROSITE-ProRule annotation9
Nucleotide bindingi424 – 432ATPPROSITE-ProRule annotation9

<p>The <a href="http://www.geneontology.org/">Gene Ontology (GO)</a> project provides a set of hierarchical controlled vocabulary split into 3 categories:<p><a href='/help/gene_ontology' target='_top'>More...</a></p>GO - Molecular functioni

Complete GO annotation on QuickGO ...

GO - Biological processi

Complete GO annotation on QuickGO ...

<p>UniProtKB Keywords constitute a <a href="http://www.uniprot.org/keywords">controlled vocabulary</a> with a hierarchical structure. Keywords summarise the content of a UniProtKB entry and facilitate the search for proteins of interest.<p><a href='/help/keywords' target='_top'>More...</a></p>Keywordsi

Molecular functionKinase, Serine/threonine-protein kinase, Transferase
Biological processCell cycle, Host-virus interaction, Stress response
LigandATP-binding, Magnesium, Metal-binding, Nucleotide-binding

Enzyme and pathway databases

BRENDA Comprehensive Enzyme Information System

More...BRENDAi		2.7.11.1, 2681

Pathway Commons web resource for biological pathway data

More...PathwayCommonsi		Q15418

Reactome - a knowledgebase of biological pathways and processes

More...Reactomei		R-HSA-198753, ERK/MAPK targets
R-HSA-199920, CREB phosphorylation
R-HSA-2559582, Senescence-Associated Secretory Phenotype (SASP)
R-HSA-437239, Recycling pathway of L1
R-HSA-442742, CREB1 phosphorylation through NMDA receptor-mediated activation of RAS signaling
R-HSA-444257, RSK activation
R-HSA-881907, Gastrin-CREB signalling pathway via PKC and MAPK

SABIO-RK: Biochemical Reaction Kinetics Database

More...SABIO-RKi		Q15418

SignaLink: a signaling pathway resource with multi-layered regulatory networks

More...SignaLinki		Q15418

SIGNOR Signaling Network Open Resource

More...SIGNORi		Q15418

<p>This section provides information about the protein and gene name(s) and synonym(s) and about the organism that is the source of the protein sequence.<p><a href='/help/names_and_taxonomy_section' target='_top'>More...</a></p>Names & Taxonomyi

<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section provides an exhaustive list of all names of the protein, from commonly used to obsolete, to allow unambiguous identification of a protein.<p><a href='/help/protein_names' target='_top'>More...</a></p>Protein namesi
Recommended name:
Ribosomal protein S6 kinase alpha-1 (EC:2.7.11.1)
Short name:
S6K-alpha-1
Alternative name(s):
90 kDa ribosomal protein S6 kinase 1
Short name:
p90-RSK 1
Short name:
p90RSK1
Short name:
p90S6K
MAP kinase-activated protein kinase 1a
Short name:
MAPK-activated protein kinase 1a
Short name:
MAPKAP kinase 1a
Short name:
MAPKAPK-1a
Ribosomal S6 kinase 1
Short name:
RSK-1
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section indicates the name(s) of the gene(s) that code for the protein sequence(s) described in the entry. Four distinct tokens exist: 'Name', 'Synonyms', 'Ordered locus names' and 'ORF names'.<p><a href='/help/gene_name' target='_top'>More...</a></p>Gene namesi
Name:RPS6KA1
Synonyms:MAPKAPK1A, RSK1
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section provides information on the name(s) of the organism that is the source of the protein sequence.<p><a href='/help/organism-name' target='_top'>More...</a></p>OrganismiHomo sapiens (Human)
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section shows the unique identifier assigned by the NCBI to the source organism of the protein. This is known as the 'taxonomic identifier' or 'taxid'.<p><a href='/help/taxonomic_identifier' target='_top'>More...</a></p>Taxonomic identifieri9606 [NCBI]
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section contains the taxonomic hierarchical classification lineage of the source organism. It lists the nodes as they appear top-down in the taxonomic tree, with the more general grouping listed first.<p><a href='/help/taxonomic_lineage' target='_top'>More...</a></p>Taxonomic lineageiEukaryota › Metazoa › Chordata › Craniata › Vertebrata › Euteleostomi › Mammalia › Eutheria › Euarchontoglires › Primates › Haplorrhini › Catarrhini › Hominidae › Homo
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section is present for entries that are part of a <a href="http://www.uniprot.org/proteomes">proteome</a>, i.e. of a set of proteins thought to be expressed by organisms whose genomes have been completely sequenced.<p><a href='/help/proteomes_manual' target='_top'>More...</a></p>Proteomesi
  • UP000005640 <p>A UniProt <a href="http://www.uniprot.org/manual/proteomes%5Fmanual">proteome</a> can consist of several components.<br></br>The component name refers to the genomic component encoding a set of proteins.<p><a href='/help/proteome_component' target='_top'>More...</a></p> Componenti: Chromosome 1

Organism-specific databases

Human Gene Nomenclature Database

More...HGNCi		HGNC:10430, RPS6KA1

Online Mendelian Inheritance in Man (OMIM)

More...MIMi		601684, gene

neXtProt; the human protein knowledge platform

More...neXtProti		NX_Q15418

Eukaryotic Pathogen, Vector and Host Database Resources

More...VEuPathDBi		HostDB:ENSG00000117676

<p>This section provides information on the location and the topology of the mature protein in the cell.<p><a href='/help/subcellular_location_section' target='_top'>More...</a></p>Subcellular locationi

Keywords - Cellular componenti

Cytoplasm, Nucleus

<p>This section provides information on the disease(s) and phenotype(s) associated with a protein.<p><a href='/help/pathology_and_biotech_section' target='_top'>More...</a></p>Pathology & Biotechi

Organism-specific databases

DisGeNET

More...DisGeNETi		6195

Open Targets

More...OpenTargetsi		ENSG00000117676

The Pharmacogenetics and Pharmacogenomics Knowledge Base

More...PharmGKBi		PA34845

Miscellaneous databases

Pharos NIH Druggable Genome Knowledgebase

More...Pharosi		Q15418, Tchem

Chemistry databases

ChEMBL database of bioactive drug-like small molecules

More...ChEMBLi		CHEMBL2553

Drug and drug target database

More...DrugBanki		DB12010, Fostamatinib
DB04751, Purvalanol A

DrugCentral

More...DrugCentrali		Q15418

IUPHAR/BPS Guide to PHARMACOLOGY

More...GuidetoPHARMACOLOGYi		1527

Genetic variation databases

BioMuta curated single-nucleotide variation and disease association database

More...BioMutai		RPS6KA1

Domain mapping of disease mutations (DMDM)

More...DMDMi		20178306

<p>This section describes post-translational modifications (PTMs) and/or processing events.<p><a href='/help/ptm_processing_section' target='_top'>More...</a></p>PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'PTM / Processing' section describes the extent of a polypeptide chain in the mature protein following processing or proteolytic cleavage.<p><a href='/help/chain' target='_top'>More...</a></p>ChainiPRO_00000861981 – 735Ribosomal protein S6 kinase alpha-1Add BLAST735

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'PTM / Processing' section specifies the position and type of each modified residue excluding <a href="http://www.uniprot.org/manual/lipid">lipids</a>, <a href="http://www.uniprot.org/manual/carbohyd">glycans</a> and <a href="http://www.uniprot.org/manual/crosslnk">protein cross-links</a>.<p><a href='/help/mod_res' target='_top'>More...</a></p>Modified residuei54PhosphoserineCombined sources1
Modified residuei221Phosphoserine; by PDPK11 Publication1
Modified residuei307PhosphoserineCombined sources1
Modified residuei359PhosphothreonineCombined sources1 Publication1
Modified residuei363PhosphoserineCombined sources1 Publication1
Modified residuei369PhosphoserineCombined sources1
Modified residuei380Phosphoserine; by autocatalysisCombined sources1 Publication1
Modified residuei573Phosphothreonine1 Publication1
Modified residuei732Phosphoserine1 Publication1

<p>This subsection of the <a href="http://www.uniprot.org/help/ptm%5Fprocessing%5Fsection">PTM/processing</a> section describes post-translational modifications (PTMs). This subsection <strong>complements</strong> the information provided at the sequence level or describes modifications for which <strong>position-specific data is not yet available</strong>.<p><a href='/help/post-translational_modification' target='_top'>More...</a></p>Post-translational modificationi

Activated by phosphorylation at Ser-221 by PDPK1. Autophosphorylated on Ser-380, as part of the activation process. May be phosphorylated at Thr-359 and Ser-363 by MAPK1/ERK2 and MAPK3/ERK1.1 Publication
N-terminal myristoylation results in an activated kinase in the absence of added growth factors.

Keywords - PTMi

Phosphoprotein

Proteomic databases

Encyclopedia of Proteome Dynamics

More...EPDi		Q15418

jPOST - Japan Proteome Standard Repository/Database

More...jPOSTi		Q15418

MassIVE - Mass Spectrometry Interactive Virtual Environment

More...MassIVEi		Q15418

MaxQB - The MaxQuant DataBase

More...MaxQBi		Q15418

PaxDb, a database of protein abundance averages across all three domains of life

More...PaxDbi		Q15418

PeptideAtlas

More...PeptideAtlasi		Q15418

PRoteomics IDEntifications database

More...PRIDEi		Q15418

ProteomicsDB: a multi-organism proteome resource

More...ProteomicsDBi		23324
60583 [Q15418-1]
60584 [Q15418-2]
60585 [Q15418-3]

2D gel databases

University College Dublin 2-DE Proteome Database

More...UCD-2DPAGEi		Q15418

PTM databases

GlyGen: Computational and Informatics Resources for Glycoscience

More...GlyGeni		Q15418, 1 site, 1 O-linked glycan (1 site)

iPTMnet integrated resource for PTMs in systems biology context

More...iPTMneti		Q15418

Comprehensive resource for the study of protein post-translational modifications (PTMs) in human, mouse and rat.

More...PhosphoSitePlusi		Q15418

<p>This section provides information on the expression of a gene at the mRNA or protein level in cells or in tissues of multicellular organisms.<p><a href='/help/expression_section' target='_top'>More...</a></p>Expressioni

Gene expression databases

Bgee dataBase for Gene Expression Evolution

More...Bgeei		ENSG00000117676, Expressed in blood and 205 other tissues

ExpressionAtlas, Differential and Baseline Expression

More...ExpressionAtlasi		Q15418, baseline and differential

Genevisible search portal to normalized and curated expression data from Genevestigator

More...Genevisiblei		Q15418, HS

Organism-specific databases

Human Protein Atlas

More...HPAi		ENSG00000117676, Low tissue specificity

<p>This section provides information on the quaternary structure of a protein and on interaction(s) with other proteins or protein complexes.<p><a href='/help/interaction_section' target='_top'>More...</a></p>Interactioni

<p>This subsection of the <a href="http://www.uniprot.org/help/interaction%5Fsection">'Interaction'</a> section provides information about the protein quaternary structure and interaction(s) with other proteins or protein complexes (with the exception of physiological receptor-ligand interactions which are annotated in the <a href="http://www.uniprot.org/help/function%5Fsection">'Function'</a> section).<p><a href='/help/subunit_structure' target='_top'>More...</a></p>Subunit structurei

Forms a complex with either MAPK1/ERK2 or MAPK3/ERK1 in quiescent cells. Transiently dissociates following mitogenic stimulation.

Interacts with ETV1/ER81 and FGFR1.

5 Publications

(Microbial infection) Interacts with Kaposi's sarcoma-associated herpesvirus/HHV-8 protein ORF45; this interaction allows RPS6KA1 activation.

1 Publication

<p>This subsection of the '<a href="http://www.uniprot.org/help/interaction%5Fsection">Interaction</a>' section provides information about binary protein-protein interactions. The data presented in this section are a quality-filtered subset of binary interactions automatically derived from the <a href="https://www.ebi.ac.uk/intact/">IntAct database</a>. It is updated at every <a href="http://www.uniprot.org/help/synchronization">UniProt release</a>.<p><a href='/help/binary_interactions' target='_top'>More...</a></p>Binary interactionsi

Hide details

Protein-protein interaction databases

The Biological General Repository for Interaction Datasets (BioGRID)

More...BioGRIDi		112109, 169 interactors

Database of interacting proteins

More...DIPi		DIP-29987N

The Eukaryotic Linear Motif resource for Functional Sites in Proteins

More...ELMi		Q15418

Protein interaction database and analysis system

More...IntActi		Q15418, 56 interactors

Molecular INTeraction database

More...MINTi		Q15418

STRING: functional protein association networks

More...STRINGi		9606.ENSP00000435412

Chemistry databases

BindingDB database of measured binding affinities

More...BindingDBi		Q15418

Miscellaneous databases

RNAct, Protein-RNA interaction predictions for model organisms.

More...RNActi		Q15418, protein

<p>This section provides information on the tertiary and secondary structure of a protein.<p><a href='/help/structure_section' target='_top'>More...</a></p>Structurei

Secondary structure

1735
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details

3D structure databases

SWISS-MODEL Repository - a database of annotated 3D protein structure models

More...SMRi		Q15418

Database of comparative protein structure models

More...ModBasei		Search...

Protein Data Bank in Europe - Knowledge Base

More...PDBe-KBi		Search...

Miscellaneous databases

Relative evolutionary importance of amino acids within a protein sequence

More...EvolutionaryTracei		Q15418

<p>This section provides information on sequence similarities with other proteins and the domain(s) present in a protein.<p><a href='/help/family_and_domains_section' target='_top'>More...</a></p>Family & Domainsi

Domains and Repeats

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/family%5Fand%5Fdomains%5Fsection">Family and Domains</a> section describes the position and type of a domain, which is defined as a specific combination of secondary structures organized into a characteristic three-dimensional structure or fold.<p><a href='/help/domain' target='_top'>More...</a></p>Domaini62 – 321Protein kinase 1PROSITE-ProRule annotationAdd BLAST260
Domaini322 – 391AGC-kinase C-terminalPROSITE-ProRule annotationAdd BLAST70
Domaini418 – 675Protein kinase 2PROSITE-ProRule annotationAdd BLAST258

<p>This subsection of the 'Family and domains' section provides information about the sequence similarity with other proteins.<p><a href='/help/sequence_similarities' target='_top'>More...</a></p>Sequence similaritiesi

Belongs to the protein kinase superfamily. AGC Ser/Thr protein kinase family. S6 kinase subfamily.Curated

Keywords - Domaini

Repeat

Phylogenomic databases

evolutionary genealogy of genes: Non-supervised Orthologous Groups

More...eggNOGi		KOG0603, Eukaryota

Ensembl GeneTree

More...GeneTreei		ENSGT00940000159314

The HOGENOM Database of Homologous Genes from Fully Sequenced Organisms

More...HOGENOMi		CLU_000288_58_0_1

InParanoid: Eukaryotic Ortholog Groups

More...InParanoidi		Q15418

Identification of Orthologs from Complete Genome Data

More...OMAi		ILEHSWV

Database of Orthologous Groups

More...OrthoDBi		1132245at2759

Database for complete collections of gene phylogenies

More...PhylomeDBi		Q15418

TreeFam database of animal gene trees

More...TreeFami		TF313438

Family and domain databases

Conserved Domains Database

More...CDDi		cd05582, STKc_RSK_N, 1 hit

Database of protein disorder

More...DisProti		DP01508

Integrated resource of protein families, domains and functional sites

More...InterProi		View protein in InterPro
IPR000961, AGC-kinase_C
IPR011009, Kinase-like_dom_sf
IPR017892, Pkinase_C
IPR000719, Prot_kinase_dom
IPR017441, Protein_kinase_ATP_BS
IPR016239, Ribosomal_S6_kinase_II
IPR041906, RSK_N
IPR008271, Ser/Thr_kinase_AS

Pfam protein domain database

More...Pfami		View protein in Pfam
PF00069, Pkinase, 2 hits
PF00433, Pkinase_C, 1 hit

PIRSF; a whole-protein classification database

More...PIRSFi		PIRSF000606, Ribsml_S6_kin_2, 1 hit

Simple Modular Architecture Research Tool; a protein domain database

More...SMARTi		View protein in SMART
SM00133, S_TK_X, 1 hit
SM00220, S_TKc, 2 hits

Superfamily database of structural and functional annotation

More...SUPFAMi		SSF56112, SSF56112, 2 hits

PROSITE; a protein domain and family database

More...PROSITEi		View protein in PROSITE
PS51285, AGC_KINASE_CTER, 1 hit
PS00107, PROTEIN_KINASE_ATP, 2 hits
PS50011, PROTEIN_KINASE_DOM, 2 hits
PS00108, PROTEIN_KINASE_ST, 2 hits

<p>This section displays by default the canonical protein sequence and upon request all isoforms described in the entry. It also includes information pertinent to the sequence(s), including <a href="http://www.uniprot.org/help/sequence%5Flength">length</a> and <a href="http://www.uniprot.org/help/sequences">molecular weight</a>. The information is filed in different subsections. The current subsections and their content are listed below:<p><a href='/help/sequences_section' target='_top'>More...</a></p>Sequences (4+)i

<p>This subsection of the <a href="http://www.uniprot.org/help/sequences%5Fsection">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical%5Fand%5Fisoforms">canonical sequence</a> displayed by default in the entry is complete or not.<p><a href='/help/sequence_status' target='_top'>More...</a></p>Sequence statusi: Complete.

This entry describes 4 <p>This subsection of the 'Sequence' section lists the alternative protein sequences (isoforms) that can be generated from the same gene by a single or by the combination of up to four biological events (alternative promoter usage, alternative splicing, alternative initiation and ribosomal frameshifting). Additionally, this section gives relevant information on each alternative protein isoform.<p><a href='/help/alternative_products' target='_top'>More...</a></p> isoformsi produced by alternative splicing. AlignAdd to basket

This entry has 4 described isoforms and 8 potential isoforms that are computationally mapped.Show allAlign All

Isoform 1 (identifier: Q15418-1) [UniParc]FASTAAdd to basket

This isoform has been chosen as the <p><strong>What is the canonical sequence?</strong><p><a href='/help/canonical_and_isoforms' target='_top'>More...</a></p>canonicali sequence. All positional information in this entry refers to it. This is also the sequence that appears in the downloadable versions of the entry.

« Hide
        10         20         30         40         50
MPLAQLKEPW PLMELVPLDP ENGQTSGEEA GLQPSKDEGV LKEISITHHV 
        60         70         80         90        100
KAGSEKADPS HFELLKVLGQ GSFGKVFLVR KVTRPDSGHL YAMKVLKKAT 
       110        120        130        140        150
LKVRDRVRTK MERDILADVN HPFVVKLHYA FQTEGKLYLI LDFLRGGDLF 
       160        170        180        190        200
TRLSKEVMFT EEDVKFYLAE LALGLDHLHS LGIIYRDLKP ENILLDEEGH 
       210        220        230        240        250
IKLTDFGLSK EAIDHEKKAY SFCGTVEYMA PEVVNRQGHS HSADWWSYGV 
       260        270        280        290        300
LMFEMLTGSL PFQGKDRKET MTLILKAKLG MPQFLSTEAQ SLLRALFKRN 
       310        320        330        340        350
PANRLGSGPD GAEEIKRHVF YSTIDWNKLY RREIKPPFKP AVAQPDDTFY 
       360        370        380        390        400
FDTEFTSRTP KDSPGIPPSA GAHQLFRGFS FVATGLMEDD GKPRAPQAPL 
       410        420        430        440        450
HSVVQQLHGK NLVFSDGYVV KETIGVGSYS ECKRCVHKAT NMEYAVKVID 
       460        470        480        490        500
KSKRDPSEEI EILLRYGQHP NIITLKDVYD DGKHVYLVTE LMRGGELLDK 
       510        520        530        540        550
ILRQKFFSER EASFVLHTIG KTVEYLHSQG VVHRDLKPSN ILYVDESGNP 
       560        570        580        590        600
ECLRICDFGF AKQLRAENGL LMTPCYTANF VAPEVLKRQG YDEGCDIWSL 
       610        620        630        640        650
GILLYTMLAG YTPFANGPSD TPEEILTRIG SGKFTLSGGN WNTVSETAKD 
       660        670        680        690        700
LVSKMLHVDP HQRLTAKQVL QHPWVTQKDK LPQSQLSHQD LQLVKGAMAA 
       710        720        730 
TYSALNSSKP TPQLKPIESS ILAQRRVRKL PSTTL
Length:735
Mass (Da):82,723
Last modified:April 16, 2002 - v2
<p>The checksum is a form of redundancy check that is calculated from the sequence. It is useful for tracking sequence updates.</p> <p>It should be noted that while, in theory, two different sequences could have the same checksum value, the likelihood that this would happen is extremely low.</p> <p>However UniProtKB may contain entries with identical sequences in case of multiple genes (paralogs).</p> <p>The checksum is computed as the sequence 64-bit Cyclic Redundancy Check value (CRC64) using the generator polynomial: x<sup>64</sup> + x<sup>4</sup> + x<sup>3</sup> + x + 1. The algorithm is described in the ISO 3309 standard. </p> <p class="publication">Press W.H., Flannery B.P., Teukolsky S.A. and Vetterling W.T.<br /> <strong>Cyclic redundancy and other checksums</strong><br /> <a href="http://www.nrbook.com/b/bookcpdf.php">Numerical recipes in C 2nd ed., pp896-902, Cambridge University Press (1993)</a>)</p> Checksum:i765731A4442A53DF
GO
Isoform 2 (identifier: Q15418-2) [UniParc]FASTAAdd to basket

The sequence of this isoform differs from the canonical sequence as follows:
     1-36: MPLAQLKEPW...GEEAGLQPSK → MEQDPKPPRL...GPGSGPQRDS

Show »
Length:744
Mass (Da):83,932
Checksum:i3121E64369EBDBBF
GO
Isoform 3 (identifier: Q15418-3) [UniParc]FASTAAdd to basket

The sequence of this isoform differs from the canonical sequence as follows:
     1-92: Missing.

Show »
Length:643
Mass (Da):72,698
Checksum:iB8362021FCCC17B5
GO
Isoform 4Curated (identifier: Q15418-4) [UniParc]FASTAAdd to basket

The sequence of this isoform differs from the canonical sequence as follows:
     1-35: MPLAQLKEPWPLMELVPLDPENGQTSGEEAGLQPS → MQTPADFPRVERDLVPCPR

Show »
Length:719
Mass (Da):81,147
Checksum:iD47F7EC9609D5ACF
GO

<p>In eukaryotic reference proteomes, unreviewed entries that are likely to belong to the same gene are computationally mapped, based on gene identifiers from Ensembl, EnsemblGenomes and model organism databases.<p><a href='/help/gene_centric_isoform_mapping' target='_top'>More...</a></p>Computationally mapped potential isoform sequencesi

There are 8 potential isoforms mapped to this entry.BLASTAlignShow allAdd to basket
EntryEntry nameProtein names
Gene namesLengthAnnotation
E9PGT3E9PGT3_HUMAN
Ribosomal protein S6 kinase
RPS6KA1
724Annotation score:

Annotation score:3 out of 5

<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
Q5SVM7Q5SVM7_HUMAN
Ribosomal protein S6 kinase alpha-1
RPS6KA1
115Annotation score:

Annotation score:1 out of 5

<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
Q5SVM6Q5SVM6_HUMAN
Ribosomal protein S6 kinase alpha-1
RPS6KA1
166Annotation score:

Annotation score:1 out of 5

<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
E9PAN7E9PAN7_HUMAN
Ribosomal protein S6 kinase alpha-1
RPS6KA1
204Annotation score:

Annotation score:1 out of 5

<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
E9PMM7E9PMM7_HUMAN
Ribosomal protein S6 kinase alpha-1
RPS6KA1
112Annotation score:

Annotation score:1 out of 5

<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
E9PPN6E9PPN6_HUMAN
Ribosomal protein S6 kinase alpha-1
RPS6KA1
52Annotation score:

Annotation score:1 out of 5

<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
A6NND1A6NND1_HUMAN
Ribosomal protein S6 kinase alpha-1
RPS6KA1
111Annotation score:

Annotation score:1 out of 5

<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
E9PPC1E9PPC1_HUMAN
Ribosomal protein S6 kinase alpha-1
RPS6KA1
56Annotation score:

Annotation score:1 out of 5

<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>

Experimental Info

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'Sequence' section reports difference(s) between the canonical sequence (displayed by default in the entry) and the different sequence submissions merged in the entry. These various submissions may originate from different sequencing projects, different types of experiments, or different biological samples. Sequence conflicts are usually of unknown origin.<p><a href='/help/conflict' target='_top'>More...</a></p>Sequence conflicti609A → T in BAF85411 (PubMed:14702039).Curated1
Sequence conflicti619S → G in BAF85411 (PubMed:14702039).Curated1

Natural variant

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'Sequence' section describes natural variant(s) of the protein sequence.<p><a href='/help/variant' target='_top'>More...</a></p>Natural variantiVAR_021864335K → T2 PublicationsCorresponds to variant dbSNP:rs2229712Ensembl.1

Alternative sequence

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'Sequence' section describes the sequence of naturally occurring alternative protein isoform(s). The changes in the amino acid sequence may be due to alternative splicing, alternative promoter usage, alternative initiation, or ribosomal frameshifting.<p><a href='/help/var_seq' target='_top'>More...</a></p>Alternative sequenceiVSP_0415801 – 92Missing in isoform 3. 1 PublicationAdd BLAST92
Alternative sequenceiVSP_0413801 – 36MPLAQ…LQPSK → MEQDPKPPRLRLWALIPWLP RKQRPRISQTSLPVPGPGSG PQRDS in isoform 2. 1 PublicationAdd BLAST36
Alternative sequenceiVSP_0574691 – 35MPLAQ…GLQPS → MQTPADFPRVERDLVPCPR in isoform 4. Add BLAST35

Sequence databases

Select the link destinations:

EMBL nucleotide sequence database

More...EMBLi

GenBank nucleotide sequence database

More...GenBanki

DNA Data Bank of Japan; a nucleotide sequence database

More...DDBJi
Links Updated
L07597 mRNA Translation: AAC82497.1
AK292722 mRNA Translation: BAF85411.1
AK299007 mRNA Translation: BAH12926.1
AK315730 mRNA Translation: BAG38085.1
AL109743 Genomic DNA Translation: CAC36348.1
AL627313 Genomic DNA No translation available.
CH471059 Genomic DNA Translation: EAX07799.1
BC014966 mRNA Translation: AAH14966.1

The Consensus CDS (CCDS) project

More...CCDSi		CCDS284.1 [Q15418-1]
CCDS30649.1 [Q15418-2]
CCDS81286.1 [Q15418-4]

Protein sequence database of the Protein Information Resource

More...PIRi		I51901

NCBI Reference Sequences

More...RefSeqi		NP_001006666.1, NM_001006665.1 [Q15418-2]
NP_001317370.1, NM_001330441.1 [Q15418-4]
NP_002944.2, NM_002953.3 [Q15418-1]

Genome annotation databases

Ensembl eukaryotic genome annotation project

More...Ensembli		ENST00000374168; ENSP00000363283; ENSG00000117676
ENST00000526792; ENSP00000431651; ENSG00000117676 [Q15418-3]
ENST00000530003; ENSP00000432281; ENSG00000117676 [Q15418-4]
ENST00000531382; ENSP00000435412; ENSG00000117676 [Q15418-2]
ENST00000628081; ENSP00000487553; ENSG00000281877 [Q15418-4]
ENST00000628256; ENSP00000487349; ENSG00000281877 [Q15418-2]
ENST00000629832; ENSP00000486881; ENSG00000281877
ENST00000631108; ENSP00000487166; ENSG00000281877 [Q15418-3]

Database of genes from NCBI RefSeq genomes

More...GeneIDi		6195

KEGG: Kyoto Encyclopedia of Genes and Genomes

More...KEGGi		hsa:6195

Matched Annotation from NCBI and EMBL-EBI (MANE) - Phase one

More...MANE-Selecti		ENST00000374168.7; ENSP00000363283.2; NM_002953.4; NP_002944.2

UCSC genome browser

More...UCSCi		uc001bmr.2, human [Q15418-1]
uc057dso.1, human

Keywords - Coding sequence diversityi

Alternative splicing

<p>This section provides links to proteins that are similar to the protein sequence(s) described in this entry at different levels of sequence identity thresholds (100%, 90% and 50%) based on their membership in UniProt Reference Clusters (<a href="http://www.uniprot.org/help/uniref">UniRef</a>).<p><a href='/help/similar_proteins_section' target='_top'>More...</a></p>Similar proteinsi

<p>This section is used to point to information related to entries and found in data collections other than UniProtKB.<p><a href='/help/cross_references_section' target='_top'>More...</a></p>Cross-referencesi

<p>This subsection of the <a href="http://www.uniprot.org/manual/cross%5Freferences%5Fsection">Cross-references</a> section provides links to various web resources that are relevant for a specific protein.<p><a href='/help/web_resource' target='_top'>More...</a></p>Web resourcesi

Atlas of Genetics and Cytogenetics in Oncology and Haematology

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
L07597 mRNA Translation: AAC82497.1
AK292722 mRNA Translation: BAF85411.1
AK299007 mRNA Translation: BAH12926.1
AK315730 mRNA Translation: BAG38085.1
AL109743 Genomic DNA Translation: CAC36348.1
AL627313 Genomic DNA No translation available.
CH471059 Genomic DNA Translation: EAX07799.1
BC014966 mRNA Translation: AAH14966.1
CCDSiCCDS284.1 [Q15418-1]
CCDS30649.1 [Q15418-2]
CCDS81286.1 [Q15418-4]
PIRiI51901
RefSeqiNP_001006666.1, NM_001006665.1 [Q15418-2]
NP_001317370.1, NM_001330441.1 [Q15418-4]
NP_002944.2, NM_002953.3 [Q15418-1]

3D structure databases

Select the link destinations:

Protein Data Bank Europe

More...PDBei

Protein Data Bank RCSB

More...RCSB PDBi

Protein Data Bank Japan

More...PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
2WNTX-ray2.40A/B413-719[»]
2Z7QX-ray2.00A33-353[»]
2Z7RX-ray2.00A33-353[»]
2Z7SX-ray2.10A33-353[»]
3RNYX-ray2.70A/B411-735[»]
3TEIX-ray2.40B712-735[»]
4H3PX-ray2.30B/E712-735[»]
4NIFX-ray2.15A/D411-735[»]
5CSFX-ray2.40C683-735[»]
5CSIX-ray2.13C689-735[»]
5CSJX-ray2.70C696-735[»]
5CSNX-ray2.95C683-720[»]
5N7DX-ray2.30C688-735[»]
5N7FX-ray2.30C688-735[»]
5N7GX-ray2.95C729-735[»]
5V61X-ray2.20I713-729[»]
5V62X-ray1.90I713-729[»]
6TWYX-ray2.30C725-735[»]
SMRiQ15418
ModBaseiSearch...
PDBe-KBiSearch...

Protein-protein interaction databases

BioGRIDi112109, 169 interactors
DIPiDIP-29987N
ELMiQ15418
IntActiQ15418, 56 interactors
MINTiQ15418
STRINGi9606.ENSP00000435412

Chemistry databases

BindingDBiQ15418
ChEMBLiCHEMBL2553
DrugBankiDB12010, Fostamatinib
DB04751, Purvalanol A
DrugCentraliQ15418
GuidetoPHARMACOLOGYi1527

PTM databases

GlyGeniQ15418, 1 site, 1 O-linked glycan (1 site)
iPTMnetiQ15418
PhosphoSitePlusiQ15418

Genetic variation databases

BioMutaiRPS6KA1
DMDMi20178306

2D gel databases

UCD-2DPAGEiQ15418

Proteomic databases

EPDiQ15418
jPOSTiQ15418
MassIVEiQ15418
MaxQBiQ15418
PaxDbiQ15418
PeptideAtlasiQ15418
PRIDEiQ15418
ProteomicsDBi23324
60583 [Q15418-1]
60584 [Q15418-2]
60585 [Q15418-3]

Protocols and materials databases

Antibodypedia a portal for validated antibodies

More...Antibodypediai		2073, 1678 antibodies from 45 providers

The DNASU plasmid repository

More...DNASUi		6195

Genome annotation databases

EnsembliENST00000374168; ENSP00000363283; ENSG00000117676
ENST00000526792; ENSP00000431651; ENSG00000117676 [Q15418-3]
ENST00000530003; ENSP00000432281; ENSG00000117676 [Q15418-4]
ENST00000531382; ENSP00000435412; ENSG00000117676 [Q15418-2]
ENST00000628081; ENSP00000487553; ENSG00000281877 [Q15418-4]
ENST00000628256; ENSP00000487349; ENSG00000281877 [Q15418-2]
ENST00000629832; ENSP00000486881; ENSG00000281877
ENST00000631108; ENSP00000487166; ENSG00000281877 [Q15418-3]
GeneIDi6195
KEGGihsa:6195
MANE-SelectiENST00000374168.7; ENSP00000363283.2; NM_002953.4; NP_002944.2
UCSCiuc001bmr.2, human [Q15418-1]
uc057dso.1, human

Organism-specific databases

Comparative Toxicogenomics Database

More...CTDi		6195
DisGeNETi6195

GeneCards: human genes, protein and diseases

More...GeneCardsi		RPS6KA1
HGNCiHGNC:10430, RPS6KA1
HPAiENSG00000117676, Low tissue specificity
MIMi601684, gene
neXtProtiNX_Q15418
OpenTargetsiENSG00000117676
PharmGKBiPA34845
VEuPathDBiHostDB:ENSG00000117676

GenAtlas: human gene database

More...GenAtlasi		Search...

Phylogenomic databases

eggNOGiKOG0603, Eukaryota
GeneTreeiENSGT00940000159314
HOGENOMiCLU_000288_58_0_1
InParanoidiQ15418
OMAiILEHSWV
OrthoDBi1132245at2759
PhylomeDBiQ15418
TreeFamiTF313438

Enzyme and pathway databases

BRENDAi2.7.11.1, 2681
PathwayCommonsiQ15418
ReactomeiR-HSA-198753, ERK/MAPK targets
R-HSA-199920, CREB phosphorylation
R-HSA-2559582, Senescence-Associated Secretory Phenotype (SASP)
R-HSA-437239, Recycling pathway of L1
R-HSA-442742, CREB1 phosphorylation through NMDA receptor-mediated activation of RAS signaling
R-HSA-444257, RSK activation
R-HSA-881907, Gastrin-CREB signalling pathway via PKC and MAPK
SABIO-RKiQ15418
SignaLinkiQ15418
SIGNORiQ15418

Miscellaneous databases

BioGRID ORCS database of CRISPR phenotype screens

More...BioGRID-ORCSi		6195, 21 hits in 1078 CRISPR screens

ChiTaRS: a database of human, mouse and fruit fly chimeric transcripts and RNA-sequencing data

More...ChiTaRSi		RPS6KA1, human
EvolutionaryTraceiQ15418

The Gene Wiki collection of pages on human genes and proteins

More...GeneWikii		RPS6KA1

Database of phenotypes from RNA interference screens in Drosophila and Homo sapiens

More...GenomeRNAii		6195
PharosiQ15418, Tchem

Protein Ontology

More...PROi		PR:Q15418
RNActiQ15418, protein

The Stanford Online Universal Resource for Clones and ESTs

More...SOURCEi		Search...

Gene expression databases

BgeeiENSG00000117676, Expressed in blood and 205 other tissues
ExpressionAtlasiQ15418, baseline and differential
GenevisibleiQ15418, HS

Family and domain databases

CDDicd05582, STKc_RSK_N, 1 hit
DisProtiDP01508
InterProiView protein in InterPro
IPR000961, AGC-kinase_C
IPR011009, Kinase-like_dom_sf
IPR017892, Pkinase_C
IPR000719, Prot_kinase_dom
IPR017441, Protein_kinase_ATP_BS
IPR016239, Ribosomal_S6_kinase_II
IPR041906, RSK_N
IPR008271, Ser/Thr_kinase_AS
PfamiView protein in Pfam
PF00069, Pkinase, 2 hits
PF00433, Pkinase_C, 1 hit
PIRSFiPIRSF000606, Ribsml_S6_kin_2, 1 hit
SMARTiView protein in SMART
SM00133, S_TK_X, 1 hit
SM00220, S_TKc, 2 hits
SUPFAMiSSF56112, SSF56112, 2 hits
PROSITEiView protein in PROSITE
PS51285, AGC_KINASE_CTER, 1 hit
PS00107, PROTEIN_KINASE_ATP, 2 hits
PS50011, PROTEIN_KINASE_DOM, 2 hits
PS00108, PROTEIN_KINASE_ST, 2 hits

MobiDB: a database of protein disorder and mobility annotations

More...MobiDBi		Search...

<p>This section provides general information on the entry.<p><a href='/help/entry_information_section' target='_top'>More...</a></p>Entry informationi

<p>This subsection of the 'Entry information' section provides a mnemonic identifier for a UniProtKB entry, but it is not a stable identifier. Each reviewed entry is assigned a unique entry name upon integration into UniProtKB/Swiss-Prot.<p><a href='/help/entry_name' target='_top'>More...</a></p>Entry nameiKS6A1_HUMAN
<p>This subsection of the 'Entry information' section provides one or more accession number(s). These are stable identifiers and should be used to cite UniProtKB entries. Upon integration into UniProtKB, each entry is assigned a unique accession number, which is called 'Primary (citable) accession number'.<p><a href='/help/accession_numbers' target='_top'>More...</a></p>AccessioniPrimary (citable) accession number: Q15418
Secondary accession number(s): A6NGG4
, A8K9K7, B2RDY8, B7Z5J0, E9PRI4, Q5SVM5, Q5SVM8, Q5SVM9, Q96C05, Q9BQK2
<p>This subsection of the 'Entry information' section shows the date of integration of the entry into UniProtKB, the date of the last sequence update and the date of the last annotation modification ('Last modified'). The version number for both the entry and the <a href="http://www.uniprot.org/help/canonical%5Fand%5Fisoforms">canonical sequence</a> are also displayed.<p><a href='/help/entry_history' target='_top'>More...</a></p>Entry historyiIntegrated into UniProtKB/Swiss-Prot: December 15, 1998
Last sequence update: April 16, 2002
Last modified: February 23, 2022
This is version 221 of the entry and version 2 of the sequence. See complete history.
<p>This subsection of the 'Entry information' section indicates whether the entry has been manually annotated and reviewed by UniProtKB curators or not, in other words, if the entry belongs to the Swiss-Prot section of UniProtKB (<strong>reviewed</strong>) or to the computer-annotated TrEMBL section (<strong>unreviewed</strong>).<p><a href='/help/entry_status' target='_top'>More...</a></p>Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programChordata Protein Annotation Program
DisclaimerAny medical or genetic information present in this entry is provided for research, educational and informational purposes only. It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care.

<p>This section contains any relevant information that doesn't fit in any other defined sections<p><a href='/help/miscellaneous_section' target='_top'>More...</a></p>Miscellaneousi

Keywords - Technical termi

3D-structure, Reference proteome

Documents

  1. Human and mouse protein kinases
    Human and mouse protein kinases: classification and index
  2. Human chromosome 1
    Human chromosome 1: entries, gene names and cross-references to MIM
  3. Human entries with genetic variants
    List of human entries with genetic variants
  4. Human variants curated from literature reports
    Index of human variants curated from literature reports
  5. MIM cross-references
    Online Mendelian Inheritance in Man (MIM) cross-references in UniProtKB/Swiss-Prot
  6. PDB cross-references
    Index of Protein Data Bank (PDB) cross-references
  7. SIMILARITY comments
    Index of protein domains and families
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