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Entry version 116 (02 Jun 2021)
Sequence version 2 (15 Dec 1998)
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Protein

Outer membrane protein A

Gene

ompA

Organism
Klebsiella pneumoniae
Status
Reviewed-Annotation score:

Annotation score:4 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

With TolR probably plays a role in maintaining the position of the peptidoglycan cell wall in the periplasm. Acts as a porin with low permeability that allows slow penetration of small solutes; an internal gate slows down solute passage.

UniRule annotation

Required for conjugation with F-type plasmids; probably serves as the mating receptor on recipient cells.

UniRule annotation

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection describes interesting single amino acid sites on the sequence that are not defined in any other subsection. This subsection can be displayed in different sections ('Function', 'PTM / Processing', 'Pathology and Biotech') according to its content.<p><a href='/help/site' target='_top'>More...</a></p>Sitei66Part of salt bridge gating mechanismUniRule annotation1
Sitei157Part of salt bridge gating mechanismUniRule annotation1

<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 functionPorin
Biological processConjugation, Ion transport, Transport

Protein family/group databases

Transport Classification Database

More...
TCDBi
1.B.6.1.11, the ompa-ompf porin (oop) 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:
Outer membrane protein AUniRule annotation
Alternative name(s):
Outer membrane porin AUniRule annotation
Outer membrane protein 3A1 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:ompAUniRule annotation
<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>OrganismiKlebsiella pneumoniae
<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 identifieri573 [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 lineageiBacteriaProteobacteriaGammaproteobacteriaEnterobacteralesEnterobacteriaceaeKlebsiella

<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 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 domaini1 – 14Periplasmic1 PublicationAdd BLAST14
<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>Transmembranei15 – 24Beta stranded1 Publication10
Topological domaini25 – 49Extracellular1 PublicationAdd BLAST25
Transmembranei50 – 59Beta stranded1 Publication10
Topological domaini60 – 62Periplasmic1 Publication3
Transmembranei63 – 71Beta stranded1 Publication9
Topological domaini72 – 89Extracellular1 PublicationAdd BLAST18
Transmembranei90 – 100Beta stranded1 PublicationAdd BLAST11
Topological domaini101 – 104Periplasmic1 Publication4
Transmembranei105 – 114Beta stranded1 Publication10
Topological domaini115 – 139Extracellular1 PublicationAdd BLAST25
Transmembranei140 – 149Beta stranded1 Publication10
Topological domaini150 – 153Periplasmic1 Publication4
Transmembranei154 – 162Beta stranded1 Publication9
Topological domaini163 – 179Extracellular1 PublicationAdd BLAST17
Transmembranei180 – 188Beta stranded1 Publication9
Topological domaini189 – 344Periplasmic1 PublicationAdd BLAST156

Keywords - Cellular componenti

Cell outer membrane, Membrane

<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 – ?Curated
<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_0000020097? – 344Outer membrane protein A

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 bondi309 ↔ 321UniRule annotation

Keywords - PTMi

Disulfide bond

<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

Monomer and homodimer.

UniRule annotation

<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

1344
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details

3D structure databases

Biological Magnetic Resonance Data Bank

More...
BMRBi
P24017

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

More...
SMRi
P24017

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
P24017

<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 'Family and Domains' section indicates the positions and types of repeated sequence motifs or repeated domains within the protein.<p><a href='/help/repeat' target='_top'>More...</a></p>Repeati199 – 20012
Repeati201 – 20222
Repeati203 – 20432
Repeati205 – 20642
<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>Domaini208 – 336OmpA-likeUniRule annotationAdd BLAST129

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>Regioni199 – 2064 X 2 AA tandem repeats of A-P8

<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

The extracellular loops are most variable in sequence, and in some bacteria confer sensitivity to phage and/or colicins.UniRule annotation

<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 outer membrane OOP (TC 1.B.6) superfamily. OmpA family. [View classification]UniRule annotation

Keywords - Domaini

Repeat, Signal, Transmembrane, Transmembrane beta strand

Family and domain databases

Conserved Domains Database

More...
CDDi
cd07185, OmpA_C-like, 1 hit

Gene3D Structural and Functional Annotation of Protein Families

More...
Gene3Di
3.30.1330.60, 1 hit

HAMAP database of protein families

More...
HAMAPi
MF_00842, OmpA, 1 hit

Integrated resource of protein families, domains and functional sites

More...
InterProi
View protein in InterPro
IPR011250, OMP/PagP_b-brl
IPR006664, OMP_bac
IPR002368, OmpA
IPR006665, OmpA-like
IPR006690, OMPA-like_CS
IPR036737, OmpA-like_sf
IPR000498, OmpA-like_TM_dom

Pfam protein domain database

More...
Pfami
View protein in Pfam
PF00691, OmpA, 1 hit
PF01389, OmpA_membrane, 1 hit

Protein Motif fingerprint database; a protein domain database

More...
PRINTSi
PR01021, OMPADOMAIN
PR01022, OUTRMMBRANEA

Superfamily database of structural and functional annotation

More...
SUPFAMi
SSF103088, SSF103088, 1 hit
SSF56925, SSF56925, 1 hit

PROSITE; a protein domain and family database

More...
PROSITEi
View protein in PROSITE
PS01068, OMPA_1, 1 hit
PS51123, OMPA_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%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.

<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 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.

P24017-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MKAIFVLNAA PKDNTWYAGG KLGWSQYHDT GFYGNGFQNN NGPTRNDQLG
60 70 80 90 100
AGAFGGYQVN PYLGFEMGYD WLGRMAYKGS VDNGAFKAQG VQLTAKLGYP
110 120 130 140 150
ITDDLDIYTR LGGMVWRADS KGNYASTGVS RSEHDTGVSP VFAGGVEWAV
160 170 180 190 200
TRDIATRLEY QWVNNIGDAG TVGTRPDNGM LSLGVSYRFG QEDAAPVVAP
210 220 230 240 250
APAPAPEVAT KHFTLKSDVL FNFNKATLKP EGQQALDQLY TQLSNMDPKD
260 270 280 290 300
GSAVVLGYTD RIGSEAYNQQ LSEKRAQSVV DYLVAKGIPA GKISARGMGE
310 320 330 340
SNPVTGNTCD NVKARAALID CLAPDRRVEI EVKGYKEVVT QPQA
Length:344
Mass (Da):37,061
Last modified:December 15, 1998 - 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:iAC88AAE3B7871B16
GO

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 conflicti335Y → I in AAA25119 (PubMed:1955870).Curated1

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
AJ000998 Genomic DNA Translation: CAA04450.1
M63355 Genomic DNA Translation: AAA25119.1

<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
AJ000998 Genomic DNA Translation: CAA04450.1
M63355 Genomic DNA Translation: AAA25119.1

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
2K0LNMR-A1-207[»]
5NHXX-ray1.95A209-334[»]
BMRBiP24017
SMRiP24017
ModBaseiSearch...
PDBe-KBiSearch...

Protein family/group databases

TCDBi1.B.6.1.11, the ompa-ompf porin (oop) family

Miscellaneous databases

EvolutionaryTraceiP24017

Family and domain databases

CDDicd07185, OmpA_C-like, 1 hit
Gene3Di3.30.1330.60, 1 hit
HAMAPiMF_00842, OmpA, 1 hit
InterProiView protein in InterPro
IPR011250, OMP/PagP_b-brl
IPR006664, OMP_bac
IPR002368, OmpA
IPR006665, OmpA-like
IPR006690, OMPA-like_CS
IPR036737, OmpA-like_sf
IPR000498, OmpA-like_TM_dom
PfamiView protein in Pfam
PF00691, OmpA, 1 hit
PF01389, OmpA_membrane, 1 hit
PRINTSiPR01021, OMPADOMAIN
PR01022, OUTRMMBRANEA
SUPFAMiSSF103088, SSF103088, 1 hit
SSF56925, SSF56925, 1 hit
PROSITEiView protein in PROSITE
PS01068, OMPA_1, 1 hit
PS51123, OMPA_2, 1 hit

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 nameiOMPA_KLEPN
<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: P24017
Secondary accession number(s): O69435
<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: March 1, 1992
Last sequence update: December 15, 1998
Last modified: June 2, 2021
This is version 116 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 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

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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