ISDA

Entry Detail

PDB ID:

1M2E

Keywords:

CIRCADIAN CLOCK PROTEIN

Title:

Solution structure of the N-terminal domain of Synechococcus elongatus KaiA (KaiA135N); Average minimized structure.

Biological Source:

Source Organism:

Synechococcus elongatus

Host Organism:

Escherichia coli BL21(DE3)

PDB Version:

Deposition Date:

2002-06-23

Release Date:

2002-11-13

Method Details:

Experimental Method:

SOLUTION NMR

Conformers Submitted:

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:KaiA
Chain IDs:A
Chain Length:135
Number of Molecules:1
Biological Source:Synechococcus elongatus

UniProt ID:Q79PF6 Pfam ID:PF21714

Ligand Molecules

Primary Citation

Structure and Function from the Circadian Clock Protein KaiA of Synechococcus elongatus: A potential Clock Input Mechanism

Williams, S.B, Vakonakis, I, Golden, S.S, LiWang, A.C.Show

Proc.Natl.Acad.Sci.USA 99 15357 15362 (2002)

PMID: 12438647 DOI: 10.1073/pnas.232517099

Abstact

In the cyanobacterium Synechococcus elongatus (PCC 7942) the proteins KaiA, KaiB, and KaiC are required for circadian clock function. We deduced a circadian clock function for KaiA from a combination of biochemical and structural data. Both KaiA and its isolated carboxyl-terminal domain (KaiA180C) stimulated KaiC autophosphorylation and facilitated attenuation of KaiC autophosphorylation by KaiB. An amino-terminal domain (KaiA135N) had no function in the autophosphorylation assay. NMR structure determination showed that KaiA135N is a pseudo-receiver domain. We propose that this pseudo-receiver is a timing input-device that regulates KaiA stimulation of KaiC autophosphorylation, which in turn is essential for circadian timekeeping.

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Primary Citation of related structures