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UniProtKB - P39301 (ULAA_ECOLI)

Entry version 154 (02 Dec 2020)
Sequence version 3 (04 Apr 2006)
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Protein

Ascorbate-specific PTS system EIIC component

Gene

ulaA

Organism
Escherichia coli (strain K12)
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

The phosphoenolpyruvate-dependent sugar phosphotransferase system (sugar PTS), a major carbohydrate active transport system, catalyzes the phosphorylation of incoming sugar substrates concomitantly with their translocation across the cell membrane. The enzyme II UlaABC PTS system is involved in ascorbate transport.1 Publication1 Publication

<p>This subsection of the 'Function' section describes biophysical and chemical properties, such as maximal absorption, kinetic parameters, pH dependence, redox potentials and temperature dependence.<p><a href='/help/biophysicochemical_properties' target='_top'>More...</a></p>Kineticsi

  1. KM=18 µM for L-ascorbate1 Publication

    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 sitei314Ascorbate1 Publication1

    <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

    Biological processPhosphotransferase system, Sugar transport, Transport

    Enzyme and pathway databases

    BioCyc Collection of Pathway/Genome Databases

    More...    BioCyci    		EcoCyc:SGAT-MONOMER
    MetaCyc:SGAT-MONOMER

    Protein family/group databases

    Transport Classification Database

    More...    TCDBi    		4.A.7.1.1, the pts l-ascorbate (l-asc) family

    <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:
    Ascorbate-specific PTS system EIIC component1 Publication
    Alternative name(s):
    Ascorbate-specific permease IIC component UlaA1 Publication
    <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:ulaA1 Publication
    Synonyms:sgaT, yjfS
    Ordered Locus Names:b4193, JW5744
    <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>OrganismiEscherichia coli (strain K12)
    <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 identifieri83333 [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 lineageiBacteria › Proteobacteria › Gammaproteobacteria › Enterobacterales › Enterobacteriaceae › Escherichia ›
    <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
    • UP000000318 <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
    • UP000000625 Componenti: Chromosome

    <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

    Topology

    Feature keyPosition(s)DescriptionActionsGraphical viewLength
    <p>This subsection of the <a href="http://www.uniprot.org/help/subcellular%5Flocation%5Fsection">'Subcellular location'</a> section describes the extent of a membrane-spanning region of the protein. It denotes the presence of both alpha-helical transmembrane regions and the membrane spanning regions of beta-barrel transmembrane proteins.<p><a href='/help/transmem' target='_top'>More...</a></p>Transmembranei14 – 34Helical1 PublicationAdd BLAST21
    Transmembranei38 – 58Helical1 PublicationAdd BLAST21
    Transmembranei101 – 121Helical1 PublicationAdd BLAST21
    Transmembranei141 – 161Helical1 PublicationAdd BLAST21
    Transmembranei233 – 253Helical1 PublicationAdd BLAST21
    Transmembranei263 – 283Helical1 PublicationAdd BLAST21
    Transmembranei316 – 336Helical1 PublicationAdd BLAST21
    Transmembranei338 – 358Helical1 PublicationAdd BLAST21
    Transmembranei379 – 399Helical1 PublicationAdd BLAST21
    Transmembranei427 – 447Helical1 PublicationAdd BLAST21

    GO - Cellular componenti

    Complete GO annotation on QuickGO ...

    Keywords - Cellular componenti

    Cell inner membrane, Cell membrane, Membrane

    <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

    <p>This subsection of the 'Pathology and Biotech' section describes the in vivo effects caused by ablation of the gene (or one or more transcripts) coding for the protein described in the entry. This includes gene knockout and knockdown, provided experiments have been performed in the context of a whole organism or a specific tissue, and not at the single-cell level.<p><a href='/help/disruption_phenotype' target='_top'>More...</a></p>Disruption phenotypei

    Cells lacking this gene are unable to use L-ascorbate.1 Publication

    <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_00000977141 – 465Ascorbate-specific PTS system EIIC componentAdd BLAST465

    Proteomic databases

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

    More...    PaxDbi    		P39301

    PRoteomics IDEntifications database

    More...    PRIDEi    		P39301

    <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

    <p>This subsection of the 'Expression' section reports the experimentally proven effects of inducers and repressors (usually chemical compounds or environmental factors) on the level of protein (or mRNA) expression (up-regulation, down-regulation, constitutive expression).<p><a href='/help/induction' target='_top'>More...</a></p>Inductioni

    Induced by L-ascorbate. Repressed by UlaR.3 Publications

    <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

    Homodimer.

    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

    P39301
    With#Exp.IntAct
    itself2EBI-556234,EBI-556234

    GO - Molecular functioni

    Complete GO annotation on QuickGO ...

    Protein-protein interaction databases

    The Biological General Repository for Interaction Datasets (BioGRID)

    More...    BioGRIDi    		4262713, 11 interactors

    Database of interacting proteins

    More...    DIPi    		DIP-10870N

    Protein interaction database and analysis system

    More...    IntActi    		P39301, 1 interactor

    STRING: functional protein association networks

    More...    STRINGi    		511145.b4193

    <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

    1465
    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    		P39301

    Database of comparative protein structure models

    More...    ModBasei    		Search...

    Protein Data Bank in Europe - Knowledge Base

    More...    PDBe-KBi    		Search...

    <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

    Region

    Feature keyPosition(s)DescriptionActionsGraphical viewLength
    <p>This subsection of the 'Family and Domains' section describes a region of interest that cannot be described in other subsections.<p><a href='/help/region' target='_top'>More...</a></p>Regioni86 – 87Ascorbate binding1 Publication2
    Regioni135 – 139Ascorbate binding1 Publication5
    Regioni194 – 195Ascorbate binding1 Publication2

    <p>This subsection of the 'Family and domains' section provides general information on the biological role of a domain. The term 'domain' is intended here in its wide acceptation, it may be a structural domain, a transmembrane region or a functional domain. Several domains are described in this subsection.<p><a href='/help/domain_cc' target='_top'>More...</a></p>Domaini

    In classical PTS systems, the PTS EIIC type-2 domain forms the translocation channel and contains the specific substrate-binding site. UlaA does not exhibit the topological features of any recognized enzyme IIC.Curated

    <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 UlaA family.Curated

    Keywords - Domaini

    Transmembrane, Transmembrane helix

    Phylogenomic databases

    evolutionary genealogy of genes: Non-supervised Orthologous Groups

    More...    eggNOGi    		COG3037, Bacteria

    The HOGENOM Database of Homologous Genes from Fully Sequenced Organisms

    More...    HOGENOMi    		CLU_031784_1_0_6

    InParanoid: Eukaryotic Ortholog Groups

    More...    InParanoidi    		P39301

    Database for complete collections of gene phylogenies

    More...    PhylomeDBi    		P39301

    Family and domain databases

    Integrated resource of protein families, domains and functional sites

    More...    InterProi    		View protein in InterPro
    IPR004703, PTS_sugar-sp_permease

    Pfam protein domain database

    More...    Pfami    		View protein in Pfam
    PF03611, EIIC-GAT, 1 hit

    <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>Sequencei

    <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.

    P39301-1 [UniParc]FASTAAdd to basket
    « Hide
            10         20         30         40         50
    MEILYNIFTV FFNQVMTNAP LLLGIVTCLG YILLRKSVSV IIKGTIKTII 
            60         70         80         90        100
    GFMLLQAGSG ILTSTFKPVV AKMSEVYGIN GAISDTYASM MATIDRMGDA 
           110        120        130        140        150
    YSWVGYAVLL ALALNICYVL LRRITGIRTI MLTGHIMFQQ AGLIAVTLFI 
           160        170        180        190        200
    FGYSMWTTII CTAILVSLYW GITSNMMYKP TQEVTDGCGF SIGHQQQFAS 
           210        220        230        240        250
    WIAYKVAPFL GKKEESVEDL KLPGWLNIFH DNIVSTAIVM TIFFGAILLS 
           260        270        280        290        300
    FGIDTVQAMA GKVHWTVYIL QTGFSFAVAI FIITQGVRMF VAELSEAFNG 
           310        320        330        340        350
    ISQRLIPGAV LAIDCAAIYS FAPNAVVWGF MWGTIGQLIA VGILVACGSS 
           360        370        380        390        400
    ILIIPGFIPM FFSNATIGVF ANHFGGWRAA LKICLVMGMI EIFGCVWAVK 
           410        420        430        440        450
    LTGMSAWMGM ADWSILAPPM MQGFFSIGIA FMAVIIVIAL AYMFFAGRAL 
           460 
    RAEEDAEKQL AEQSA
    Length:465
    Mass (Da):50,737
    Last modified:April 4, 2006 - v3
    <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:iCCFF1C776FEA4716
    GO

    <p>This subsection of the 'Sequence' section reports difference(s) between the protein sequence shown in the UniProtKB entry and other available protein sequences derived from the same gene.<p><a href='/help/sequence_caution' target='_top'>More...</a></p>Sequence cautioni

    The sequence AAA97089 differs from that shown. Reason: Erroneous initiation. Extended N-terminus.Curated

    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 conflicti451 – 465RAEED…AEQSA → AQKKMQKNNWQNSLLNKEF in AAA97089 (PubMed:7610040).CuratedAdd BLAST15

    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
    		U14003 Genomic DNA Translation: AAA97089.1 Different initiation.
    U00096 Genomic DNA Translation: AAC77150.2
    AP009048 Genomic DNA Translation: BAE78194.1

    Protein sequence database of the Protein Information Resource

    More...    PIRi    		D65230

    NCBI Reference Sequences

    More...    RefSeqi    		NP_418614.4, NC_000913.3
    WP_001350568.1, NZ_LN832404.1

    Genome annotation databases

    Ensembl bacterial and archaeal genome annotation project

    More...    EnsemblBacteriai    		AAC77150; AAC77150; b4193
    BAE78194; BAE78194; BAE78194

    Database of genes from NCBI RefSeq genomes

    More...    GeneIDi    		948717

    KEGG: Kyoto Encyclopedia of Genes and Genomes

    More...    KEGGi    		ecj:JW5744
    eco:b4193

    Pathosystems Resource Integration Center (PATRIC)

    More...    PATRICi    		fig|1411691.4.peg.2508

    <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

    Sequence databases

    Select the link destinations:
    EMBLi
    GenBanki
    DDBJi
    Links Updated
    		U14003 Genomic DNA Translation: AAA97089.1 Different initiation.
    U00096 Genomic DNA Translation: AAC77150.2
    AP009048 Genomic DNA Translation: BAE78194.1
    PIRiD65230
    RefSeqiNP_418614.4, NC_000913.3
    WP_001350568.1, NZ_LN832404.1

    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
    4RP8X-ray2.36A/C1-465[»]
    4RP9X-ray1.65A1-465[»]
    SMRiP39301
    ModBaseiSearch...
    PDBe-KBiSearch...

    Protein-protein interaction databases

    BioGRIDi4262713, 11 interactors
    DIPiDIP-10870N
    IntActiP39301, 1 interactor
    STRINGi511145.b4193

    Protein family/group databases

    TCDBi4.A.7.1.1, the pts l-ascorbate (l-asc) family

    Proteomic databases

    PaxDbiP39301
    PRIDEiP39301

    Genome annotation databases

    EnsemblBacteriaiAAC77150; AAC77150; b4193
    BAE78194; BAE78194; BAE78194
    GeneIDi948717
    KEGGiecj:JW5744
    eco:b4193
    PATRICifig|1411691.4.peg.2508

    Organism-specific databases

    EchoBASE - an integrated post-genomic database for E. coli

    More...    EchoBASEi    		EB2386

    Phylogenomic databases

    eggNOGiCOG3037, Bacteria
    HOGENOMiCLU_031784_1_0_6
    InParanoidiP39301
    PhylomeDBiP39301

    Enzyme and pathway databases

    BioCyciEcoCyc:SGAT-MONOMER
    MetaCyc:SGAT-MONOMER

    Miscellaneous databases

    Protein Ontology

    More...    PROi    		PR:P39301

    Family and domain databases

    InterProiView protein in InterPro
    IPR004703, PTS_sugar-sp_permease
    PfamiView protein in Pfam
    PF03611, EIIC-GAT, 1 hit

    ProtoNet; Automatic hierarchical classification of proteins

    More...    ProtoNeti    		Search...

    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 nameiULAA_ECOLI
    <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: P39301
    Secondary accession number(s): Q2M6B2
    <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: February 1, 1995
    Last sequence update: April 4, 2006
    Last modified: December 2, 2020
    This is version 154 of the entry and version 3 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 programProkaryotic Protein Annotation Program

    <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. PDB cross-references
      Index of Protein Data Bank (PDB) cross-references
    2. SIMILARITY comments
      Index of protein domains and families
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