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Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 PLoS+Biol 2015 ; 13 (11): ä Nephropedia Template TP
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CRY Drives Cyclic CK2-Mediated BMAL1 Phosphorylation to Control the Mammalian Circadian Clock #MMPMID26562092
Tamaru T; Hattori M; Honda K; Nakahata Y; Sassone-Corsi P; van der Horst GTJ; Ozawa T; Takamatsu K
PLoS Biol 2015[Nov]; 13 (11): ä PMID26562092show ga
Intracellular circadian clocks, composed of clock genes that act in transcription-translation feedback loops, drive global rhythmic expression of the mammalian transcriptome and allow an organism to anticipate to the momentum of the day. Using a novel clock-perturbing peptide, we established a pivotal role for casein kinase (CK)-2-mediated circadian BMAL1-Ser90 phosphorylation (BMAL1-P) in regulating central and peripheral core clocks. Subsequent analysis of the underlying mechanism showed a novel role of CRY as a repressor for protein kinase. Co-immunoprecipitation experiments and real-time monitoring of protein?protein interactions revealed that CRY-mediated periodic binding of CK2? to BMAL1 inhibits BMAL1-Ser90 phosphorylation by CK2?. The FAD binding domain of CRY1, two C-terminal BMAL1 domains, and particularly BMAL1-Lys537 acetylation/deacetylation by CLOCK/SIRT1, were shown to be critical for CRY-mediated BMAL1?CK2? binding. Reciprocally, BMAL1-Ser90 phosphorylation is prerequisite for BMAL1-Lys537 acetylation. We propose a dual negative-feedback model in which a CRY-dependent CK2-driven posttranslational BMAL1?P-BMAL1 loop is an integral part of the core clock oscillator.