IBPB_SERP5
ID IBPB_SERP5 Reviewed; 142 AA.
AC A8G7R9;
DT 28-JUL-2009, integrated into UniProtKB/Swiss-Prot.
DT 13-NOV-2007, sequence version 1.
DT 25-MAY-2022, entry version 70.
DE RecName: Full=Small heat shock protein IbpB {ECO:0000255|HAMAP-Rule:MF_02001};
DE AltName: Full=16 kDa heat shock protein B {ECO:0000255|HAMAP-Rule:MF_02001};
GN Name=ibpB {ECO:0000255|HAMAP-Rule:MF_02001}; OrderedLocusNames=Spro_0049;
OS Serratia proteamaculans (strain 568).
OC Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacterales;
OC Yersiniaceae; Serratia.
OX NCBI_TaxID=399741;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=568;
RG US DOE Joint Genome Institute;
RA Copeland A., Lucas S., Lapidus A., Barry K., Glavina del Rio T., Dalin E.,
RA Tice H., Pitluck S., Chain P., Malfatti S., Shin M., Vergez L., Schmutz J.,
RA Larimer F., Land M., Hauser L., Kyrpides N., Kim E., Taghavi S., Newman L.,
RA Vangronsveld J., van der Lelie D., Richardson P.;
RT "Complete sequence of chromosome of Serratia proteamaculans 568.";
RL Submitted (SEP-2007) to the EMBL/GenBank/DDBJ databases.
CC -!- FUNCTION: Associates with aggregated proteins, together with IbpA, to
CC stabilize and protect them from irreversible denaturation and extensive
CC proteolysis during heat shock and oxidative stress. Aggregated proteins
CC bound to the IbpAB complex are more efficiently refolded and
CC reactivated by the ATP-dependent chaperone systems ClpB and
CC DnaK/DnaJ/GrpE. Its activity is ATP-independent. {ECO:0000255|HAMAP-
CC Rule:MF_02001}.
CC -!- SUBUNIT: Homodimer. Forms homomultimers of about 100-150 subunits at
CC optimal growth temperatures. Conformation changes to oligomers at high
CC temperatures or high ionic concentrations. The decrease in size of the
CC multimers is accompanied by an increase in chaperone activity.
CC {ECO:0000255|HAMAP-Rule:MF_02001}.
CC -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_02001}.
CC -!- DOMAIN: The N- and C-terminal flexible termini are involved in
CC oligomerization and in the binding of non-native substrate proteins,
CC and are essential for chaperone activity. {ECO:0000255|HAMAP-
CC Rule:MF_02001}.
CC -!- SIMILARITY: Belongs to the small heat shock protein (HSP20) family.
CC {ECO:0000255|HAMAP-Rule:MF_02001, ECO:0000255|PROSITE-
CC ProRule:PRU00285}.
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DR EMBL; CP000826; ABV39159.1; -; Genomic_DNA.
DR RefSeq; WP_012004522.1; NC_009832.1.
DR AlphaFoldDB; A8G7R9; -.
DR SMR; A8G7R9; -.
DR STRING; 399741.Spro_0049; -.
DR EnsemblBacteria; ABV39159; ABV39159; Spro_0049.
DR KEGG; spe:Spro_0049; -.
DR eggNOG; COG0071; Bacteria.
DR HOGENOM; CLU_046737_4_2_6; -.
DR OMA; EGYLHRG; -.
DR OrthoDB; 1523369at2; -.
DR GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR GO; GO:0050821; P:protein stabilization; IEA:UniProtKB-UniRule.
DR CDD; cd06470; ACD_IbpA-B_like; 1.
DR Gene3D; 2.60.40.790; -; 1.
DR HAMAP; MF_02001; HSP20_IbpB; 1.
DR InterPro; IPR002068; A-crystallin/Hsp20_dom.
DR InterPro; IPR037913; ACD_IbpA/B.
DR InterPro; IPR008978; HSP20-like_chaperone.
DR InterPro; IPR022848; HSP20_IbpB.
DR Pfam; PF00011; HSP20; 1.
DR SUPFAM; SSF49764; SSF49764; 1.
DR PROSITE; PS01031; SHSP; 1.
PE 3: Inferred from homology;
KW Chaperone; Cytoplasm; Stress response.
FT CHAIN 1..142
FT /note="Small heat shock protein IbpB"
FT /id="PRO_1000189113"
FT DOMAIN 25..136
FT /note="sHSP"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00285"
SQ SEQUENCE 142 AA; 15944 MW; 6B091884A8870284 CRC64;
MRNYDLSPLL RQWIGFDKLA SSMGGQEPQG FPPYNIEKSD DNHYRISLAL AGFKQSELDI
EVEGPRLTVR GKPTPSEKQV EYLHQGLVCK EFALTFTLAE HLQVSEAQFE NGLLHIDLVR
QVPEALQPQR IAIGTTPGLE AK
