KaiC intersubunit communication facilitates robustness of circadian rhythms in cyanobacteria

Yohko Kitayama (), Taeko Nishiwaki-Ohkawa, Yukiko Sugisawa and Takao Kondo
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Yohko Kitayama: Graduate School of Science, Nagoya University and CREST, Japan Science and Technology Agency (JST)
Taeko Nishiwaki-Ohkawa: Graduate School of Science, Nagoya University and CREST, Japan Science and Technology Agency (JST)
Yukiko Sugisawa: Graduate School of Science, Nagoya University and CREST, Japan Science and Technology Agency (JST)
Takao Kondo: Graduate School of Science, Nagoya University and CREST, Japan Science and Technology Agency (JST)

Nature Communications, 2013, vol. 4, issue 1, 1-13

Abstract: Abstract The cyanobacterial circadian clock is the only model clock to have been reconstituted in vitro. KaiC, the central clock component, is a homohexameric ATPase with autokinase and autophosphatase activities. Changes in phosphorylation state have been proposed to switch KaiC’s activity between autokinase and autophosphatase. Here we analyse the molecular mechanism underlying the regulation of KaiC’s activity, in the context of its hexameric structure. We reconstitute KaiC hexamers containing different variant protomers, and measure their autophosphatase and autokinase activities. We identify two types of regulatory mechanisms with distinct functions. First, local interactions between adjacent phosphorylation sites regulate KaiC’s activities, coupling the ATPase and nucleotide-binding states at subunit interfaces of the CII domain. Second, the phosphorylation states of the protomers affect the overall activity of KaiC hexamers via intersubunit communication. Our findings indicate that intra-hexameric interactions play an important role in sustaining robust circadian rhythmicity.

Date: 2013
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DOI: 10.1038/ncomms3897

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