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Journal of Biological Rhythms
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The Evolution of the Cyanobacterial Posttranslational Clock from a Primitive "Phoscillator"

Mirre J.P. Simons

Department of Chronobiology, University of Groningen, Haren, The Netherlands, m.j.p.simons{at}rug.nl

Cyanobacteria were among the 1st organisms to evolve on earth. The molecular circadian clock proteins of cyanobacteria and their phylogenetics have recently been elucidated. This allows for a conjecture on the evolution of 1 of the 1st circadian clocks. A scenario has now been created by combining known in vitro and in vivo properties of the 3 clock proteins of cyanobacteria (KaiA, KaiB, and KaiC). This scenario describes the evolution of the cyanobacterial clock in gradual steps: evolving from a masking mechanism, toward an hourglass, into a clock.

Key Words: cyanobacteria • circadian clock • evolution • KaiC • phoscillator • transcription translation loop • hourglass

Journal of Biological Rhythms, Vol. 24, No. 3, 175-182 (2009)
DOI: 10.1177/0748730409333953
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