![]() ![]() ![]() High temperatures enhance the CCA1 binding activity, which is precisely counterbalanced by the CK2 opposing function. CK2 activity does not alter protein accumulation or subcellular localization but interferes with CCA1 binding affinity to the promoters of the oscillator genes. Our study uncovers a previously unpredicted mechanism for CK2 antagonizing the key clock regulator CIRCADIAN CLOCK-ASSOCIATED 1 (CCA1). By using ChIP and Double–ChIP experiments together with in vivo luminescence assays at different temperatures, we were able to identify a temperature-dependent function for CK2 modulating circadian period length. However, the biological relevance and the precise mechanisms of CK2 function within the plant clockwork are not known. Two CK2 regulatory subunits, CKB3 and CKB4, have been also linked with the Arabidopsis thaliana circadian system. CK2 regulates the stability and nuclear localization of essential clock proteins in mammals, fungi, and insects. The protein kinase CK2 is one of the few clock components that is evolutionary conserved among different taxonomic groups. Circadian rhythms are daily biological oscillations driven by an endogenous mechanism known as circadian clock. ![]()
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