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Entry version 106 (07 Apr 2021)
Sequence version 3 (23 Jan 2007)
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Protein

DNA-binding transcriptional activator HetR

Gene

hetR

Organism
Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576)
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

Controls heterocyst differentiation. Dimerization is required for DNA-binding. Has both a protease and a DNA-binding activity.UniRule annotation
Controls heterocyst differentiation; increased expression leads to more heterocysts than usual (PubMed:1840555). Has protease activity (PubMed:9560210). Binds the promoter regions of hetR, hepA and patS and is required for their expression. Dimerization is required for DNA-binding, DNA-binding is inhibited by the PatS6 peptide (PubMed:15051891). In Nostoc filaments, approximately every 10th vegetative cell terminally differentiates into a heterocyst specialized for nitrogen fixation (PubMed:8412673, PubMed:10692362, PubMed:15051891).5 Publications

<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

Protease activity is inhibited by PMSF, suggesting this is a serine protease.1 Publication

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<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 sitei152UniRule annotation1 Publication1

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 bindingi34 – 40DNA1 Publication7
Nucleotide bindingi60 – 76DNA1 PublicationAdd BLAST17
Nucleotide bindingi179 – 181DNA1 Publication3

<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

GO - Biological processi

<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 functionActivator, DNA-binding, Hydrolase, Protease, Serine protease
Biological processTranscription, Transcription regulation

Protein family/group databases

MEROPS protease database

More...
MEROPSi
S48.001

<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:
DNA-binding transcriptional activator HetR1 PublicationUniRule annotation (EC:3.4.21.-UniRule annotation1 Publication)
Alternative name(s):
Heterocyst differentiation control proteinUniRule annotation
<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:hetR1 PublicationUniRule annotation
Ordered Locus Names:alr2339
<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>OrganismiNostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576)
<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 identifieri103690 [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 lineageiBacteriaCyanobacteriaNostocalesNostocaceaeNostoc
<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
  • UP000002483 <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

<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

Unable to differentiate heterocysts, normal vegetative growth.1 Publication

Mutagenesis

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/manual/pathology%5Fand%5Fbiotech%5Fsection">'Pathology and Biotech'</a> section describes the effect of the experimental mutation of one or more amino acid(s) on the biological properties of the protein.<p><a href='/help/mutagen' target='_top'>More...</a></p>Mutagenesisi48C → A: Loss of homodimerization, does not form heterocysts, not dominant to wild-type protein. Does not bind DNA. 1 Publication1
Mutagenesisi142S → A: Behaves like wild-type. 1 Publication1
Mutagenesisi152S → A: Loss of protease activity, does not form heterocysts, does not down-regulate its own expression. 1 Publication1
Mutagenesisi179S → N in strain 216; unable to control heterocyst differentiation, has no protease activity, homodimerizes, binds DNA, dominant to wild-type protein. 3 Publications1
Mutagenesisi223R → W: Greatly decreased PatS6 binding. 1 Publication1
Mutagenesisi253E → A: Loss of PatS6 binding, PatS6 no longer blocks DNA-binding. 1 Publication1
Mutagenesisi254E → A: Decreased PatS6 binding, PatS still blocks DNA-binding. 1 Publication1
Mutagenesisi256D → A: Decreased PatS6 binding. 1 Publication1
Mutagenesisi270 – 278DEIIRTWAD → AEIIRTWAA: Loss of PatS6 binding, PatS6 no longer blocks DNA-binding. 1 Publication9
Mutagenesisi270D → A: Decreased PatS6 binding. 1 Publication1
Mutagenesisi278D → A: Decreased PatS6 binding. 1 Publication1

<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_00002084781 – 299DNA-binding transcriptional activator HetRAdd BLAST299

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the PTM / Processing":/help/ptm_processing_section section describes the positions of cysteine residues participating in disulfide bonds.<p><a href='/help/disulfid' target='_top'>More...</a></p>Disulfide bondi48InterchainUniRule annotation1 Publication1 Publication

<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

Probably autodegrades.2 Publications

Keywords - PTMi

Autocatalytic cleavage, Disulfide bond

<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 provides information on the expression of the gene product at various stages of a cell, tissue or organism development. By default, the information is derived from experiments at the mRNA level, unless specified 'at the protein level'.<p><a href='/help/developmental_stage' target='_top'>More...</a></p>Developmental stagei

Accumulates only in cells that are going to differentiate into heterocysts.1 Publication

<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

By nitrogen deficiency (at protein level). Activates its own expression (PubMed:10692362, PubMed:1840555, PubMed:8412673). Transcription increases quickly upon nitrogen reduction and remains high during heterocyst differentiation (at least 24 hours). Transcription is blocked by the C-terminal PatS peptide (sequence Arg-Gly-Ser-Gly-Arg) (PubMed:15051891).5 Publications

Keywords - Developmental stagei

Heterocyst

<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

Upon expression in E.coli most protein is monomeric, although varying amounts of homodimer can be seen (Probable). Homodimer; disulfide-linked (PubMed:15051891) (By similarity). Homodimer (Ref. 8, PubMed:26576507). Binds the 6 residue C-terminal peptide of PatS; one peptide binds to each subunit (PubMed:26576507).

UniRule annotation1 Publication3 Publications

<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

P27709
With#Exp.IntAct
itself2EBI-15592082,EBI-15592082

GO - Molecular functioni

Protein-protein interaction databases

Database of interacting proteins

More...
DIPi
DIP-61232N

Protein interaction database and analysis system

More...
IntActi
P27709, 1 interactor

STRING: functional protein association networks

More...
STRINGi
103690.17131431

<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

1299
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
P27709

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>Regioni1 – 98DNA-binding domain1 PublicationAdd BLAST98
Regioni99 – 216Flap domain1 PublicationAdd BLAST118
Regioni217 – 299Hood domain1 PublicationAdd BLAST83

<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

Has an N-terminal DNA-binding domain that inserts into the DNA major groove, a central flap domain and C-terminal hood domain. The hood domain binds the PatS6 peptide. Upon PatS6 binding the flap domain probably moves considerably.1 Publication

<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 peptidase S48 family.UniRule annotation

Phylogenomic databases

evolutionary genealogy of genes: Non-supervised Orthologous Groups

More...
eggNOGi
ENOG502Z96Q, Bacteria

Identification of Orthologs from Complete Genome Data

More...
OMAi
HHIEPKR

Database of Orthologous Groups

More...
OrthoDBi
590352at2

Family and domain databases

Gene3D Structural and Functional Annotation of Protein Families

More...
Gene3Di
1.10.10.1670, 1 hit
1.10.10.1680, 1 hit

HAMAP database of protein families

More...
HAMAPi
MF_00781, HetR, 1 hit

Integrated resource of protein families, domains and functional sites

More...
InterProi
View protein in InterPro
IPR040949, HetR_C
IPR041936, HetR_DNA-bd_N
IPR041935, HetR_flap
IPR005319, Pept_S48_HetR

Pfam protein domain database

More...
Pfami
View protein in Pfam
PF18460, HetR_C, 1 hit
PF03574, Peptidase_S48, 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.

P27709-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MSNDIDLIKR LGPSAMDQIM LYLAFSAMRT SGHRHGAFLD AAATAAKCAI
60 70 80 90 100
YMTYLEQGQN LRMTGHLHHL EPKRVKIIVE EVRQALMEGK LLKTLGSQEP
110 120 130 140 150
RYLIQFPYVW MEQYPWIPGR SRIPGTSLTS EEKRQIEHKL PSNLPDAQLV
160 170 180 190 200
TSFEFLELIE FLHKRSQEDL PPEHRMELSE ALAEHIKRRL LYSGTVTRID
210 220 230 240 250
SPWGMPFYAL TRPFYAPADD QERTYIMVED TARYFRMMKD WAEKRPNAMR
260 270 280 290
ALEELDVPPE RWDEAMQELD EIIRTWADKY HQVGGIPMIL QMVFGRKED
Length:299
Mass (Da):34,969
Last modified:January 23, 2007 - 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:i74AF6CA9D87F9126
GO

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
M37779 Genomic DNA Translation: AAA21998.1
BA000019 Genomic DNA Translation: BAB74038.1

Protein sequence database of the Protein Information Resource

More...
PIRi
A38705
AD2098

NCBI Reference Sequences

More...
RefSeqi
WP_010996495.1, NZ_RSCN01000004.1

Genome annotation databases

Ensembl bacterial and archaeal genome annotation project

More...
EnsemblBacteriai
BAB74038; BAB74038; BAB74038

Database of genes from NCBI RefSeq genomes

More...
GeneIDi
58722805

KEGG: Kyoto Encyclopedia of Genes and Genomes

More...
KEGGi
ana:alr2339

<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
M37779 Genomic DNA Translation: AAA21998.1
BA000019 Genomic DNA Translation: BAB74038.1
PIRiA38705
AD2098
RefSeqiWP_010996495.1, NZ_RSCN01000004.1

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
4HRIX-ray2.95A/B1-299[»]
4LH9X-ray2.05A256-295[»]
4YNLX-ray2.10A/B/M/N219-299[»]
4YRVX-ray2.80A/B1-299[»]
SMRiP27709
ModBaseiSearch...
PDBe-KBiSearch...

Protein-protein interaction databases

DIPiDIP-61232N
IntActiP27709, 1 interactor
STRINGi103690.17131431

Protein family/group databases

MEROPSiS48.001

Genome annotation databases

EnsemblBacteriaiBAB74038; BAB74038; BAB74038
GeneIDi58722805
KEGGiana:alr2339

Phylogenomic databases

eggNOGiENOG502Z96Q, Bacteria
OMAiHHIEPKR
OrthoDBi590352at2

Family and domain databases

Gene3Di1.10.10.1670, 1 hit
1.10.10.1680, 1 hit
HAMAPiMF_00781, HetR, 1 hit
InterProiView protein in InterPro
IPR040949, HetR_C
IPR041936, HetR_DNA-bd_N
IPR041935, HetR_flap
IPR005319, Pept_S48_HetR
PfamiView protein in Pfam
PF18460, HetR_C, 1 hit
PF03574, Peptidase_S48, 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 nameiHETR_NOSS1
<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: P27709
<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: August 1, 1992
Last sequence update: January 23, 2007
Last modified: April 7, 2021
This is version 106 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, Direct protein sequencing, Reference proteome

Documents

  1. Peptidase families
    Classification of peptidase families and list of entries
  2. PDB cross-references
    Index of Protein Data Bank (PDB) cross-references
  3. SIMILARITY comments
    Index of protein domains and families
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