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Annotation rule MF_01835
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General rule information [?]

Accession MF_01835
Dates 13-SEP-2004 (Created)
19-NOV-2019 (Last updated, Version 12)
Name KaiB
Scope
Bacteria; Cyanobacteria
Templates Q79PF5 (KAIB_SYNE7); Q8YT41 (KAIB_NOSS1): [Recover all]

Propagated annotation [?]


Identifier, protein and gene names [?]

Identifier
KAIB
Protein name
RecName: Full=Circadian clock protein KaiB;
Gene name
kaiB

Comments [?]

case not <OC:Prochloraceae>
Function Component of the KaiABC clock protein complex, which constitutes the main circadian regulator in cyanobacteria. The KaiABC complex may act as a promoter-non-specific transcription regulator that represses transcription, possibly by acting on the state of chromosome compaction. In the complex, it decreases the phosphorylation status of KaiC. It has no effect on KaiC by itself, but instead needs the presence of both KaiA and KaiC, suggesting that it acts by antagonizing the interaction between KaiA and KaiC.
Subunit Homodimer. Component of the KaiABC complex, at least composed of a KaiC homohexamer, a KaiB dimer and two KaiA dimers. The KaiABC complex also interacts with SasA.
end case
case <OC:Prochloraceae>
Function Probable component of the KaiBC clock protein complex, which constitutes the main circadian regulator in cyanobacteria. In the complex, it may affect the phosphorylation status of KaiC.
Subunit Homodimer. Probable component of the KaiBC complex with KaiC and SasA.
end case
Similarity Belongs to the KaiB family.

Keywords [?]


Gene Ontology [?]

GO:0007623; Biological process: circadian rhythm.

Cross-references [?]

Pfam PF07689; KaiB; 1;
TIGRFAMs TIGR02654; circ_KaiB; 1;

Additional information [?]

Size range 102-119 amino acids
Related rules None
Fusion None
Comments Prochlorales do not contain the KaiA protein, which constitutes a regulator of KaiC, suggesting that regulation of circadian cycle is different in these bacteria.