ID   IBPB_SHIB3              Reviewed;         142 AA.
AC   B2TUT6;
DT   28-JUL-2009, integrated into UniProtKB/Swiss-Prot.
DT   01-JUL-2008, sequence version 1.
DT   25-MAY-2022, entry version 66.
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};
GN   OrderedLocusNames=SbBS512_E4233;
OS   Shigella boydii serotype 18 (strain CDC 3083-94 / BS512).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacterales;
OC   Enterobacteriaceae; Shigella.
OX   NCBI_TaxID=344609;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=CDC 3083-94 / BS512;
RA   Rasko D.A., Rosovitz M., Maurelli A.T., Myers G., Seshadri R., Cer R.,
RA   Jiang L., Ravel J., Sebastian Y.;
RT   "Complete sequence of Shigella boydii serotype 18 strain BS512.";
RL   Submitted (MAY-2008) 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; CP001063; ACD07660.1; -; Genomic_DNA.
DR   RefSeq; WP_001243425.1; NC_010658.1.
DR   AlphaFoldDB; B2TUT6; -.
DR   SMR; B2TUT6; -.
DR   STRING; 344609.SbBS512_E4233; -.
DR   EnsemblBacteria; ACD07660; ACD07660; SbBS512_E4233.
DR   KEGG; sbc:SbBS512_E4233; -.
DR   HOGENOM; CLU_046737_4_2_6; -.
DR   OMA; SGNEGYP; -.
DR   Proteomes; UP000001030; Chromosome.
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_1000189114"
FT   DOMAIN          26..137
FT                   /note="sHSP"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00285"
SQ   SEQUENCE   142 AA;  16063 MW;  8669D6B66D510A97 CRC64;
     MRNFDLSPLM RQWIGFDKLA NALQNAGEGQ SFPPYNIEKS DDNHYRITLA LAGFRQEDLE
     IQLEGTRLSV KGTPEQPKEE KKWLHQGLMN QPFSLSFTLA ENMEVSGATF VNGLLHIDLI
     RNEPEPIAAQ RIAISERPAL NS