Light-dependent sequestration of TIMELESS by CRYPTOCHROME

M. Fernanda Ceriani, Thomas K. Darlington, David Staknis, Paloma Más, Allegra A. Petti, Charles J. Weitz, Steve A. Kay

Research output: Contribution to journalArticlepeer-review

466 Scopus citations


Most organisms have circadian docks consisting of negative feedback loops of gene regulation that facilitate adaptation to cycles of light and darkness. In this study, CRYPTOCHROME (CRY), a protein involved in circadian photoperception in Drosophila, is shown to block the function of PERIOD/TIMELESS (PER/TIM) heterodimeric complexes in a light-dependent fashion. TIM degradation does not occur under these conditions; thus, TIM degradation is uncoupled from abrogation of its function by light. CRY and TIM are part of the same complex and directly interact in yeast in a light- dependent fashion. PER/TIM and CRY influence the subcellular distribution of these protein complexes, which reside primarily in the nucleus after the perception of a light signal. Thus, CRY acts as a circadian photoreceptor by directly interacting with core components of the circadian dock.

Original languageEnglish
Pages (from-to)553-556
Number of pages4
Issue number5427
StatePublished - Jul 23 1999


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