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Protein

Protease 7

Gene

ompT

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

Protease that can cleave T7 RNA polymerase, ferric enterobactin receptor protein (FEP), antimicrobial peptide protamine and other proteins. This protease has a specificity for paired basic residues.1 Publication

Miscellaneous

Was originally classified as a serine protease, but it seems that OmpT could have a novel catalytic mechanism involving an Asp/His dyad and a pair of Asp.
Encoded by the cryptic lambdoid prophage DLP12.

<p>This subsection of the <a href="http://www.uniprot.org/help/function_section">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

  • Has a virtual requirement for Arg in the P1 position and a slightly less stringent preference for this residue in the P1' position, which can also contain Lys, Gly or Val. EC:3.4.23.49

<p>This subsection of the ‘Function’ 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

Inhibited by zinc.

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the ‘Function’ 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 sitei1031 Publication1
Active sitei1051 Publication1
Active sitei2301 Publication1
Active sitei2321 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

  • aspartic-type endopeptidase activity Source: UniProtKB-KW
  • endopeptidase activity Source: EcoliWiki
  • serine-type endopeptidase activity Source: EcoliWiki

GO - Biological processi

  • proteolysis Source: EcoCyc

<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 functionAspartyl protease, Hydrolase, Protease

Enzyme and pathway databases

BioCyc Collection of Pathway/Genome Databases

More...
BioCyci
EcoCyc:EG10673-MONOMER
MetaCyc:EG10673-MONOMER

BRENDA Comprehensive Enzyme Information System

More...
BRENDAi
3.4.23.49 2026

Protein family/group databases

MEROPS protease database

More...
MEROPSi
A26.001

Transport Classification Database

More...
TCDBi
9.B.50.1.1 the outer membrane beta-barrel endoprotease, omptin (omptin) 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_and_taxonomy_section">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:
Protease 7 (EC:3.4.23.49)
Alternative name(s):
Omptin
Outer membrane protein 3B
Protease A
Protease VII
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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:ompT
Ordered Locus Names:b0565, JW0554
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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_and_taxonomy_section">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_and_taxonomy_section">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 lineageiBacteriaProteobacteriaGammaproteobacteriaEnterobacteralesEnterobacteriaceaeEscherichia
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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_manual">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

Organism-specific databases

Escherichia coli strain K12 genome database

More...
EcoGenei
EG10673 ompT

<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_location_section">'Subcellular location'</a> section describes the subcellular compartment where each non-membrane region of a membrane-spanning protein is found.<p><a href='/help/topo_dom' target='_top'>More...</a></p>Topological domaini21 – 31PeriplasmicSequence analysisAdd BLAST11
<p>This subsection of the <a href="http://www.uniprot.org/help/subcellular_location_section">'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>Transmembranei32 – 41Beta strandedSequence analysis10
Topological domaini42 – 69ExtracellularSequence analysisAdd BLAST28
Transmembranei70 – 78Beta strandedSequence analysis9
Topological domaini79 – 83PeriplasmicSequence analysis5
Transmembranei84 – 92Beta strandedSequence analysis9
Topological domaini93 – 130ExtracellularSequence analysisAdd BLAST38
Transmembranei131 – 140Beta strandedSequence analysis10
Topological domaini141 – 145PeriplasmicSequence analysis5
Transmembranei146 – 156Beta strandedSequence analysisAdd BLAST11
Topological domaini157 – 197ExtracellularSequence analysisAdd BLAST41
Transmembranei198 – 209Beta strandedSequence analysisAdd BLAST12
Topological domaini210 – 211PeriplasmicSequence analysis2
Transmembranei212 – 221Beta strandedSequence analysis10
Topological domaini222 – 250ExtracellularSequence analysisAdd BLAST29
Transmembranei251 – 261Beta strandedSequence analysisAdd BLAST11
Topological domaini262 – 264PeriplasmicSequence analysis3
Transmembranei265 – 274Beta strandedSequence analysis10
Topological domaini275 – 306ExtracellularSequence analysisAdd BLAST32
Transmembranei307 – 316Beta strandedSequence analysis10
Topological domaini317PeriplasmicSequence analysis1

GO - Cellular componenti

Keywords - Cellular componenti

Cell outer 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

Mutagenesis

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/manual/pathology_and_biotech_section">'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>Mutagenesisi103D → A: Loss of activity. 1 Publication1
Mutagenesisi105D → A: Loss of activity. 1 Publication1
Mutagenesisi230D → A: Loss of activity. 1 Publication1
Mutagenesisi236 – 237GK → KG: 70% of wild-type enzymatic activity. 2
Mutagenesisi237K → T: 40% of wild-type enzymatic activity. 1 Publication1
Mutagenesisi238R → L: Loss of activity. 1

<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 denotes the presence of an N-terminal signal peptide.<p><a href='/help/signal' target='_top'>More...</a></p>Signal peptidei1 – 204 PublicationsAdd BLAST20
<p>This subsection of the ‘PTM / Processing’ section describes the extent of a polypeptide chain in the mature protein following processing.<p><a href='/help/chain' target='_top'>More...</a></p>ChainiPRO_000002581521 – 317Protease 7Add BLAST297

Proteomic databases

jPOST - Japan Proteome Standard Repository/Database

More...
jPOSTi
P09169

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

More...
PaxDbi
P09169

PRoteomics IDEntifications database

More...
PRIDEi
P09169

2D gel databases

Two-dimensional polyacrylamide gel electrophoresis database from the Geneva University Hospital

More...
SWISS-2DPAGEi
P09169

<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_section">'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_section">'Function'</a> section).<p><a href='/help/subunit_structure' target='_top'>More...</a></p>Subunit structurei

Homopentamer.Curated

Protein-protein interaction databases

The Biological General Repository for Interaction Datasets (BioGrid)

More...
BioGridi
4263520, 171 interactors

STRING: functional protein association networks

More...
STRINGi
316385.ECDH10B_0631

<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

1317
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details

3D structure databases

Select the link destinations:

Protein Data Bank Europe

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PDBei

Protein Data Bank RCSB

More...
RCSB PDBi

Protein Data Bank Japan

More...
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1I78X-ray2.60A/B21-317[»]

Protein Model Portal of the PSI-Nature Structural Biology Knowledgebase

More...
ProteinModelPortali
P09169

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

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SMRi
P09169

Database of comparative protein structure models

More...
ModBasei
Search...

MobiDB: a database of protein disorder and mobility annotations

More...
MobiDBi
Search...

Miscellaneous databases

Relative evolutionary importance of amino acids within a protein sequence

More...
EvolutionaryTracei
P09169

<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

<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 A26 family.Curated

Keywords - Domaini

Signal, Transmembrane, Transmembrane beta strand

Phylogenomic databases

evolutionary genealogy of genes: Non-supervised Orthologous Groups

More...
eggNOGi
ENOG4108NC2 Bacteria
COG4571 LUCA

The HOGENOM Database of Homologous Genes from Fully Sequenced Organisms

More...
HOGENOMi
HOG000117799

KEGG Orthology (KO)

More...
KOi
K01355

Family and domain databases

Integrated resource of protein families, domains and functional sites

More...
InterProi
View protein in InterPro
IPR020080 OM_adhesin/peptidase_omptin
IPR020079 Peptidase_A26_CS
IPR000036 Peptidase_A26_omptin

Pfam protein domain database

More...
Pfami
View protein in Pfam
PF01278 Omptin, 1 hit

PIRSF; a whole-protein classification database

More...
PIRSFi
PIRSF001522 Peptidase_A26, 1 hit

Protein Motif fingerprint database; a protein domain database

More...
PRINTSi
PR00482 OMPTIN

Superfamily database of structural and functional annotation

More...
SUPFAMi
SSF69917 SSF69917, 1 hit

PROSITE; a protein domain and family database

More...
PROSITEi
View protein in PROSITE
PS00834 OMPTIN_1, 1 hit
PS00835 OMPTIN_2, 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_length">length</a> and <a href="http://www.uniprot.org/help/sequences">molecular weight</a>.<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_section">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical_and_isoforms">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.

<p>This subsection of the <a href="http://www.uniprot.org/help/sequences_section">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical_and_isoforms">canonical sequence</a> displayed by default in the entry is in its mature form or if it represents the precursor.<p><a href='/help/sequence_processing' target='_top'>More...</a></p>Sequence processingi: The displayed sequence is further processed into a mature form.

P09169-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MRAKLLGIVL TTPIAISSFA STETLSFTPD NINADISLGT LSGKTKERVY
60 70 80 90 100
LAEEGGRKVS QLDWKFNNAA IIKGAINWDL MPQISIGAAG WTTLGSRGGN
110 120 130 140 150
MVDQDWMDSS NPGTWTDESR HPDTQLNYAN EFDLNIKGWL LNEPNYRLGL
160 170 180 190 200
MAGYQESRYS FTARGGSYIY SSEEGFRDDI GSFPNGERAI GYKQRFKMPY
210 220 230 240 250
IGLTGSYRYE DFELGGTFKY SGWVESSDND EHYDPGKRIT YRSKVKDQNY
260 270 280 290 300
YSVAVNAGYY VTPNAKVYVE GAWNRVTNKK GNTSLYDHNN NTSDYSKNGA
310
GIENYNFITT AGLKYTF
Length:317
Mass (Da):35,562
Last modified:July 1, 1989 - v1
<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:iCA112FE7F6336F61
GO

Sequence databases

Select the link destinations:

EMBL nucleotide sequence database

More...
EMBLi

GenBank nucleotide sequence database

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GenBanki

DNA Data Bank of Japan; a nucleotide sequence database

More...
DDBJi
Links Updated
X06903 Genomic DNA Translation: CAA30008.1
M23630 Genomic DNA Translation: AAA24430.1
U82598 Genomic DNA Translation: AAB40761.1
U00096 Genomic DNA Translation: AAC73666.1
AP009048 Genomic DNA Translation: BAA35199.2

Protein sequence database of the Protein Information Resource

More...
PIRi
A31387

NCBI Reference Sequences

More...
RefSeqi
NP_415097.1, NC_000913.3
WP_001201845.1, NZ_LN832404.1

Genome annotation databases

Ensembl bacterial and archaeal genome annotation project

More...
EnsemblBacteriai
AAC73666; AAC73666; b0565
BAA35199; BAA35199; BAA35199

Database of genes from NCBI RefSeq genomes

More...
GeneIDi
945185

KEGG: Kyoto Encyclopedia of Genes and Genomes

More...
KEGGi
ecj:JW0554
eco:b0565

Pathosystems Resource Integration Center (PATRIC)

More...
PATRICi
fig|1411691.4.peg.1709

<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
X06903 Genomic DNA Translation: CAA30008.1
M23630 Genomic DNA Translation: AAA24430.1
U82598 Genomic DNA Translation: AAB40761.1
U00096 Genomic DNA Translation: AAC73666.1
AP009048 Genomic DNA Translation: BAA35199.2
PIRiA31387
RefSeqiNP_415097.1, NC_000913.3
WP_001201845.1, NZ_LN832404.1

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1I78X-ray2.60A/B21-317[»]
ProteinModelPortaliP09169
SMRiP09169
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

BioGridi4263520, 171 interactors
STRINGi316385.ECDH10B_0631

Protein family/group databases

MEROPSiA26.001
TCDBi9.B.50.1.1 the outer membrane beta-barrel endoprotease, omptin (omptin) family

2D gel databases

SWISS-2DPAGEiP09169

Proteomic databases

jPOSTiP09169
PaxDbiP09169
PRIDEiP09169

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

EnsemblBacteriaiAAC73666; AAC73666; b0565
BAA35199; BAA35199; BAA35199
GeneIDi945185
KEGGiecj:JW0554
eco:b0565
PATRICifig|1411691.4.peg.1709

Organism-specific databases

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

More...
EchoBASEi
EB0667
EcoGeneiEG10673 ompT

Phylogenomic databases

eggNOGiENOG4108NC2 Bacteria
COG4571 LUCA
HOGENOMiHOG000117799
KOiK01355

Enzyme and pathway databases

BioCyciEcoCyc:EG10673-MONOMER
MetaCyc:EG10673-MONOMER
BRENDAi3.4.23.49 2026

Miscellaneous databases

EvolutionaryTraceiP09169

Protein Ontology

More...
PROi
PR:P09169

Family and domain databases

InterProiView protein in InterPro
IPR020080 OM_adhesin/peptidase_omptin
IPR020079 Peptidase_A26_CS
IPR000036 Peptidase_A26_omptin
PfamiView protein in Pfam
PF01278 Omptin, 1 hit
PIRSFiPIRSF001522 Peptidase_A26, 1 hit
PRINTSiPR00482 OMPTIN
SUPFAMiSSF69917 SSF69917, 1 hit
PROSITEiView protein in PROSITE
PS00834 OMPTIN_1, 1 hit
PS00835 OMPTIN_2, 1 hit

ProtoNet; Automatic hierarchical classification of proteins

More...
ProtoNeti
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 nameiOMPT_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: P09169
<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_and_isoforms">canonical sequence</a> are also displayed.<p><a href='/help/entry_history' target='_top'>More...</a></p>Entry historyiIntegrated into UniProtKB/Swiss-Prot: July 1, 1989
Last sequence update: July 1, 1989
Last modified: January 16, 2019
This is version 156 of the entry and version 1 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, Complete proteome, Direct protein sequencing, Reference proteome

Documents

  1. Peptidase families
    Classification of peptidase families and list of entries
  2. SIMILARITY comments
    Index of protein domains and families
  3. PDB cross-references
    Index of Protein Data Bank (PDB) cross-references
  4. Escherichia coli
    Escherichia coli (strain K12): entries and cross-references to EcoGene
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