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Advances in the Molecular Mechanism of the Core Circadian Oscillator of Cyanobacteria

CHEN Weiqun;LIU Song;LIU Sen;Institute of Molecular Biology,College of Medical Science,China Three Gorges University;  
Circadian rhythm is a rather generally existing phenomenon in nearly all species on the earth including cyanobacteria.It is widely accepted that circadian rhythm is regulated by circadian clocks,and the circadian clock in cyanobacteria is the simplest one known so far.Although there are many questions remained on the molecular mechanism of the cyanobacterial circadian clock,it is well known that the core oscillator of this circadian clock consists of three proteins(KaiA/KaiB/KaiC),which can form a circadian oscillator independent of transcriptional/translational regulations.In this paper,the authors reviewed the recent researches on the core oscillator of the cyanobacterial circadian clock,including the composition of the circadian clock,the core-oscillator proteins and their interactions,the molecular mechanism of the oscillator,and the future research perspectives.The better understanding of the cyanobacterial circadian clock will be very meaningful to the study of the circadian clocks and related diseases in human.
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