Abstract
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.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, Non-P.H.S.
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Research Support, U.S. Gov't, P.H.S.
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Review
MeSH terms
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Cryptochromes
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Drosophila Proteins*
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Eye Proteins*
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Flavoproteins / metabolism*
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Ligases / metabolism
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Photoreceptor Cells, Invertebrate*
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Phytochrome / metabolism*
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Plant Cells
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Plant Physiological Phenomena
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Plants / metabolism*
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Protein Processing, Post-Translational / physiology
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Receptors, G-Protein-Coupled
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Signal Transduction / physiology*
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Transcription Factors / metabolism*
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Ubiquitin-Protein Ligases
Substances
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Cryptochromes
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Drosophila Proteins
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Eye Proteins
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Flavoproteins
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Receptors, G-Protein-Coupled
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Transcription Factors
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cry protein, Drosophila
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Phytochrome
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Ubiquitin-Protein Ligases
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Ligases