ID   KAIB_PROM9              Reviewed;         105 AA.
AC   Q319E4;
DT   05-FEB-2008, integrated into UniProtKB/Swiss-Prot.
DT   06-DEC-2005, sequence version 1.
DT   25-MAY-2022, entry version 79.
DE   RecName: Full=Circadian clock protein KaiB {ECO:0000255|HAMAP-Rule:MF_01835};
GN   Name=kaiB {ECO:0000255|HAMAP-Rule:MF_01835};
GN   OrderedLocusNames=PMT9312_1441;
OS   Prochlorococcus marinus (strain MIT 9312).
OC   Bacteria; Cyanobacteria; Synechococcales; Prochlorococcaceae;
OC   Prochlorococcus.
OX   NCBI_TaxID=74546;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=MIT 9312;
RG   US DOE Joint Genome Institute;
RA   Copeland A., Lucas S., Lapidus A., Barry K., Detter J.C., Glavina T.,
RA   Hammon N., Israni S., Pitluck S., Thiel J., Schmutz J., Larimer F.,
RA   Land M., Kyrpides N., Lykidis A., Richardson P.;
RT   "Complete sequence of Prochlorococcus marinus str. MIT 9312.";
RL   Submitted (JUL-2005) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: Component of the KaiABC clock protein complex, which
CC       constitutes the main circadian regulator in cyanobacteria. The KaiABC
CC       complex may act as a promoter-non-specific transcription regulator that
CC       represses transcription, possibly by acting on the state of chromosome
CC       compaction. In the complex, it decreases the phosphorylation status of
CC       KaiC. It has no effect on KaiC by itself, but instead needs the
CC       presence of both KaiA and KaiC, suggesting that it acts by antagonizing
CC       the interaction between KaiA and KaiC. {ECO:0000255|HAMAP-
CC       Rule:MF_01835}.
CC   -!- SUBUNIT: Homodimer. Component of the KaiABC complex, at least composed
CC       of a KaiC homohexamer, a KaiB dimer and two KaiA dimers. The KaiABC
CC       complex also interacts with SasA. {ECO:0000255|HAMAP-Rule:MF_01835}.
CC   -!- SIMILARITY: Belongs to the KaiB family. {ECO:0000255|HAMAP-
CC       Rule:MF_01835}.
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DR   EMBL; CP000111; ABB50501.1; -; Genomic_DNA.
DR   RefSeq; WP_011376985.1; NC_007577.1.
DR   AlphaFoldDB; Q319E4; -.
DR   SMR; Q319E4; -.
DR   STRING; 74546.PMT9312_1441; -.
DR   EnsemblBacteria; ABB50501; ABB50501; PMT9312_1441.
DR   KEGG; pmi:PMT9312_1441; -.
DR   eggNOG; COG4251; Bacteria.
DR   HOGENOM; CLU_144073_0_0_3; -.
DR   OMA; NEFKGVY; -.
DR   OrthoDB; 1999883at2; -.
DR   Proteomes; UP000002715; Chromosome.
DR   GO; GO:0007623; P:circadian rhythm; IEA:UniProtKB-UniRule.
DR   GO; GO:0042326; P:negative regulation of phosphorylation; IEA:InterPro.
DR   CDD; cd02978; KaiB_like; 1.
DR   HAMAP; MF_01835; KaiB; 1.
DR   InterPro; IPR013474; Circ_KaiB.
DR   InterPro; IPR039022; KaiB-like.
DR   InterPro; IPR011649; KaiB_domain.
DR   InterPro; IPR036249; Thioredoxin-like_sf.
DR   PANTHER; PTHR41709; PTHR41709; 1.
DR   Pfam; PF07689; KaiB; 1.
DR   SMART; SM01248; KaiB; 1.
DR   SUPFAM; SSF52833; SSF52833; 1.
DR   TIGRFAMs; TIGR02654; circ_KaiB; 1.
PE   3: Inferred from homology;
KW   Biological rhythms.
FT   CHAIN           1..105
FT                   /note="Circadian clock protein KaiB"
FT                   /id="PRO_1000070459"
SQ   SEQUENCE   105 AA;  11828 MW;  602F9B0D61F89110 CRC64;
     MAARKTYILK LYVAGNTPNS MRALNTLREI LENEFKGVYA LKVIDVLKQP QLAEEDKILA
     TPTLAKILPP PVRRIIGDLS DREKVLIGLD LLFDELTETE YSGDK