ID   KAIB_SYNR3              Reviewed;         110 AA.
AC   A5GV19;
DT   05-FEB-2008, integrated into UniProtKB/Swiss-Prot.
DT   12-JUN-2007, sequence version 1.
DT   25-MAY-2022, entry version 71.
DE   RecName: Full=Circadian clock protein KaiB {ECO:0000255|HAMAP-Rule:MF_01835};
GN   Name=kaiB {ECO:0000255|HAMAP-Rule:MF_01835};
GN   OrderedLocusNames=SynRCC307_1825;
OS   Synechococcus sp. (strain RCC307).
OC   Bacteria; Cyanobacteria; Synechococcales; Synechococcaceae; Synechococcus;
OC   unclassified Synechococcus.
OX   NCBI_TaxID=316278;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=RCC307;
RG   Genoscope;
RL   Submitted (MAY-2006) 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; CT978603; CAK28728.1; -; Genomic_DNA.
DR   RefSeq; WP_011936241.1; NC_009482.1.
DR   AlphaFoldDB; A5GV19; -.
DR   SMR; A5GV19; -.
DR   STRING; 316278.SynRCC307_1825; -.
DR   EnsemblBacteria; CAK28728; CAK28728; SynRCC307_1825.
DR   KEGG; syr:SynRCC307_1825; -.
DR   eggNOG; COG4251; Bacteria.
DR   HOGENOM; CLU_144073_0_0_3; -.
DR   OMA; NEFKGVY; -.
DR   OrthoDB; 1999883at2; -.
DR   Proteomes; UP000001115; 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; Reference proteome.
FT   CHAIN           1..110
FT                   /note="Circadian clock protein KaiB"
FT                   /id="PRO_1000070463"
SQ   SEQUENCE   110 AA;  12411 MW;  AEFEC6C6B8B1F178 CRC64;
     MSPRKTYILK LYVAGNTPNS MRALKTLRNI LETEFLGVYA LKVIDVLKQP QLAEEDKILA
     TPTLAKILPP PVRRIIGDLS DRERVLIGLD LLYEELSDDS NAQVLDDFSE