ID   KAIB_RIPO1              Reviewed;         104 AA.
AC   Q8VL14; B7K6A3;
DT   11-OCT-2004, integrated into UniProtKB/Swiss-Prot.
DT   01-MAR-2002, sequence version 1.
DT   25-MAY-2022, entry version 82.
DE   RecName: Full=Circadian clock protein KaiB {ECO:0000255|HAMAP-Rule:MF_01835};
GN   Name=kaiB {ECO:0000255|HAMAP-Rule:MF_01835};
GN   OrderedLocusNames=PCC8801_4232;
OS   Rippkaea orientalis (strain PCC 8801) (Cyanothece sp. (strain PCC 8801)).
OC   Bacteria; Cyanobacteria; Oscillatoriophycideae; Chroococcales;
OC   Aphanothecaceae; Rippkaea; Rippkaea orientalis.
OX   NCBI_TaxID=41431;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RA   Lin R.-F., Huang T.-C., Chen L.-R.;
RT   "Hypothetical kaiB and kaiC genes in Synechococcus RF-1.";
RL   Submitted (OCT-2001) to the EMBL/GenBank/DDBJ databases.
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=PCC 8801;
RX   PubMed=21972240; DOI=10.1128/mbio.00214-11;
RA   Bandyopadhyay A., Elvitigala T., Welsh E., Stockel J., Liberton M., Min H.,
RA   Sherman L.A., Pakrasi H.B.;
RT   "Novel metabolic attributes of the genus Cyanothece, comprising a group of
RT   unicellular nitrogen-fixing Cyanobacteria.";
RL   MBio 2:E214-E214(2011).
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; AF442204; AAL34545.1; -; Genomic_DNA.
DR   EMBL; CP001287; ACK68156.1; -; Genomic_DNA.
DR   RefSeq; WP_015785210.1; NC_011726.1.
DR   AlphaFoldDB; Q8VL14; -.
DR   SMR; Q8VL14; -.
DR   STRING; 41431.PCC8801_4232; -.
DR   EnsemblBacteria; ACK68156; ACK68156; PCC8801_4232.
DR   KEGG; cyp:PCC8801_4232; -.
DR   eggNOG; COG4251; Bacteria.
DR   HOGENOM; CLU_144073_0_0_3; -.
DR   OMA; NEFKGVY; -.
DR   OrthoDB; 1999883at2; -.
DR   Proteomes; UP000008204; 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..104
FT                   /note="Circadian clock protein KaiB"
FT                   /id="PRO_0000217768"
SQ   SEQUENCE   104 AA;  11837 MW;  B73BDC6F621E092D CRC64;
     MVNFKKTYVL KLYVAGNTPN SVRALKTLKN ILEDEFKGVY ALKVIDVLKN PQLAEEDKIL
     ATPTLSKILP PPVRKIIGDL SDREKVLIGL DLLYEEIRER ESEL