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Deprecated: Implicit conversion from float 235.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Science 2017 ; 355 (6330): 1174-80 Nephropedia Template TP
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Structural basis of the day-night transition in a bacterial circadian clock #MMPMID28302851
Tseng R; Goularte NF; Chavan A; Luu J; Cohen SE; Chang YG; Heisler J; Li S; Michael AK; Tripathi S; Golden SS; LiWang A; Partch CL
Science 2017[Mar]; 355 (6330): 1174-80 PMID28302851show ga
Circadian clocks are ubiquitous timing systems that induce rhythms of biological activities in synchrony with night and day. In cyanobacteria, timing is generated by a posttranslational clock consisting of KaiA, KaiB, and KaiC proteins and a set of output signaling proteins, SasA and CikA, which transduce this rhythm to control gene expression. Here, we describe crystal and nuclear magnetic resonance structures of KaiB-KaiC, KaiA-KaiB-KaiC, and CikA-KaiB complexes. They reveal how the metamorphic properties of KaiB, a protein that adopts two distinct folds, and the post?adenosine triphosphate hydrolysis state of KaiC create a hub around which nighttime signaling events revolve, including inactivation of KaiA and reciprocal regulation of the mutually antagonistic signaling proteins, SasA and CikA.