What question did this study set out to answer?

To determine whether circadian cycling of KaiC phosphorylation in Synechococcus elongatus requires an autoregulatory transcription-translation feedback loop.

November 18, 2004Science

No Transcription-Translation Feedback in Circadian Rhythm of KaiC Phosphorylation

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Authors

JTJun TomitaNagoya City University MNMasato NakajimaYamanashi Prefectural Central Hospital TKTakao KondoHokkaido Information University

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Implication

Experimental study demonstrates temperature-compensated KaiC phosphorylation cycling in cyanobacteria, indicating timekeeping independent of transcription-translation feedback.

Key Points

To determine whether circadian cycling of KaiC phosphorylation in Synechococcus elongatus requires an autoregulatory transcription-translation feedback loop.
Monitored KaiC phosphorylation state in Synechococcus elongatus under continuous dark conditions lacking kaiBC mRNA accumulation.
Assessed rhythm persistence following pharmacological inhibition of cellular transcription or translation.
Measured kinetic rates of KaiC autophosphorylation and dephosphorylation in vitro across different temperatures.
KaiC phosphorylation maintained robust, temperature-compensated circadian cycling in continuous darkness despite the complete absence of kaiBC mRNA accumulation.
Circadian oscillations of KaiC phosphorylation persisted following treatment with transcription or translation inhibitors.
In vitro ratios of KaiC autophosphorylation and dephosphorylation displayed temperature-compensated kinetics in the absence of transcriptional machinery.

Cite This Study

Tomita et al. (2004) studied this question.

synapsesocial.com/papers/69de9b84499d77a496b0c0eb https://doi.org/10.1126/science.1102540

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Implication

Experimental study demonstrates temperature-compensated KaiC phosphorylation cycling in cyanobacteria, indicating timekeeping independent of transcription-translation feedback.

No Transcription-Translation Feedback in Circadian Rhythm of KaiC Phosphorylation

Discussion

Member takes

Implication

Key Points

Cite This Study

No Transcription-Translation Feedback in Circadian Rhythm of KaiC Phosphorylation

Discussion

Member takes

Implication

Key Points

Cite This Study

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