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Protein

Small heat shock protein IbpB

Gene

ibpB

Organism
Escherichia coli O17:K52:H18 (strain UMN026 / ExPEC)
Status
Reviewed-Annotation score: Annotation score: 2 out of 5-Protein inferred from homologyi

Functioni

Associates with aggregated proteins, together with IbpA, to stabilize and protect them from irreversible denaturation and extensive proteolysis during heat shock and oxidative stress. Aggregated proteins bound to the IbpAB complex are more efficiently refolded and reactivated by the ATP-dependent chaperone systems ClpB and DnaK/DnaJ/GrpE. Its activity is ATP-independent.UniRule annotation

GO - Biological processi

Complete GO annotation...

Keywords - Molecular functioni

Chaperone

Keywords - Biological processi

Stress response

Names & Taxonomyi

Protein namesi
Recommended name:
Small heat shock protein IbpBUniRule annotation
Alternative name(s):
16 kDa heat shock protein BUniRule annotation
Gene namesi
Name:ibpBUniRule annotation
Ordered Locus Names:ECUMN_4217
OrganismiEscherichia coli O17:K52:H18 (strain UMN026 / ExPEC)
Taxonomic identifieri585056 [NCBI]
Taxonomic lineageiBacteriaProteobacteriaGammaproteobacteriaEnterobacterialesEnterobacteriaceaeEscherichia
Proteomesi
  • UP000007097 Componenti: Chromosome

Subcellular locationi

  • Cytoplasm UniRule annotation

GO - Cellular componenti

Complete GO annotation...

Keywords - Cellular componenti

Cytoplasm

PTM / Processingi

Molecule processing

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Chaini1 – 142142Small heat shock protein IbpBPRO_1000189103Add
BLAST

Interactioni

Subunit structurei

Homodimer. Forms homomultimers of about 100-150 subunits at optimal growth temperatures. Conformation changes to oligomers at high temperatures or high ionic concentrations. The decrease in size of the multimers is accompanied by an increase in chaperone activity.UniRule annotation

Structurei

3D structure databases

ProteinModelPortaliB7NF03.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Domaini

The N- and C-terminal flexible termini are involved in oligomerization and in the binding of non-native substrate proteins, and are essential for chaperone activity.UniRule annotation

Sequence similaritiesi

Belongs to the small heat shock protein (HSP20) family.UniRule annotation

Phylogenomic databases

HOGENOMiHOG000251750.
KOiK04081.
OMAiKESEYLH.

Family and domain databases

Gene3Di2.60.40.790. 1 hit.
HAMAPiMF_02001. HSP20_IbpB. 1 hit.
InterProiIPR002068. A-crystallin/Hsp20_dom.
IPR031107. HSP20.
IPR008978. HSP20-like_chaperone.
IPR022848. HSP20_IbpB.
[Graphical view]
PANTHERiPTHR11527. PTHR11527. 1 hit.
PfamiPF00011. HSP20. 1 hit.
[Graphical view]
SUPFAMiSSF49764. SSF49764. 1 hit.
PROSITEiPS01031. HSP20. 1 hit.
[Graphical view]

Sequencei

Sequence statusi: Complete.

B7NF03-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MRNFDLSPLM RQWIGFDKLA NALQNAGESQ SFPPYNIEKS DDNHYRITLA
60 70 80 90 100
LAGFRQEDLE IQLEGTRLSV KGTPEQPKEE KKWLHQGLMN QPFSLSFTLA
110 120 130 140
ENMEVSGATF VNGLLHIDLI RNEPEPIAAQ RIAISERPAL NS
Length:142
Mass (Da):16,093
Last modified:March 24, 2009 - v1
Checksum:i7666BB1BDB8A673A
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
CU928163 Genomic DNA. Translation: CAR15357.1.
RefSeqiWP_001243431.1. NC_011751.1.
YP_002414851.1. NC_011751.1.

Genome annotation databases

EnsemblBacteriaiCAR15357; CAR15357; ECUMN_4217.
GeneIDi7159255.
KEGGieum:ECUMN_4217.
PATRICi18447745. VBIEscCol32010_4389.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
CU928163 Genomic DNA. Translation: CAR15357.1.
RefSeqiWP_001243431.1. NC_011751.1.
YP_002414851.1. NC_011751.1.

3D structure databases

ProteinModelPortaliB7NF03.
ModBaseiSearch...
MobiDBiSearch...

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

EnsemblBacteriaiCAR15357; CAR15357; ECUMN_4217.
GeneIDi7159255.
KEGGieum:ECUMN_4217.
PATRICi18447745. VBIEscCol32010_4389.

Phylogenomic databases

HOGENOMiHOG000251750.
KOiK04081.
OMAiKESEYLH.

Family and domain databases

Gene3Di2.60.40.790. 1 hit.
HAMAPiMF_02001. HSP20_IbpB. 1 hit.
InterProiIPR002068. A-crystallin/Hsp20_dom.
IPR031107. HSP20.
IPR008978. HSP20-like_chaperone.
IPR022848. HSP20_IbpB.
[Graphical view]
PANTHERiPTHR11527. PTHR11527. 1 hit.
PfamiPF00011. HSP20. 1 hit.
[Graphical view]
SUPFAMiSSF49764. SSF49764. 1 hit.
PROSITEiPS01031. HSP20. 1 hit.
[Graphical view]
ProtoNetiSearch...

Entry informationi

Entry nameiIBPB_ECOLU
AccessioniPrimary (citable) accession number: B7NF03
Entry historyi
Integrated into UniProtKB/Swiss-Prot: July 28, 2009
Last sequence update: March 24, 2009
Last modified: September 7, 2016
This is version 49 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programProkaryotic Protein Annotation Program

Miscellaneousi

Keywords - Technical termi

Complete proteome

Documents

  1. SIMILARITY comments
    Index of protein domains and families

Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.