No transcription-translation feedback in circadian rhythm of KaiC phosphorylation

Jun Tomita, Masato Nakajima, Takao Kondo, Hideo Iwasaki

Research output: Contribution to journalArticlepeer-review

351 Citations (Scopus)


An autoregulatory transcription-translation feedback loop is thought to be essential in generating circadian rhythms in any model organism. In the cyanobacterium Synechococcus elongatus, the essential clock protein KaiC is proposed to form this type of transcriptional negative feedback. Nevertheless, we demonstrate here temperature-compensated, robust circadian cycling of KaiC phosphorylation even without kaiBC messenger RNA accumulation under continuous dark conditions. This rhythm persisted in the presence of a transcription or translation inhibitor. Moreover, kinetic profiles in the ratio of KaiC autophosphorylation-dephosphorylation were also temperature compensated in vitro. Thus, the cyanobacterial clock can keep time independent of de novo transcription and translation processes.

Original languageEnglish
Pages (from-to)251-254
Number of pages4
Issue number5707
Publication statusPublished - 2005 Jan 14
Externally publishedYes

ASJC Scopus subject areas

  • General

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