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Curr Opin Cell Biol. 2002 Apr;14(2):180-8.

Photosensory perception and signalling in plant cells: new paradigms?

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Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720, USA.


Plants monitor informational light signals using three sensory photoreceptor families: the phototropins, cryptochromes and phytochromes. Recent advances suggest that the phytochromes act transcriptionally by targeting light signals directly to photoresponsive promoters through binding to a transcriptional regulator. By contrast, the cryptochromes appear to act post-translationally, by disrupting extant proteosome-mediated degradation of a key transcriptional activator through direct binding to a putative E3 ubiquitin ligase, thereby elevating levels of the activator and consequently of target gene expression.

[Indexed for MEDLINE]

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