Abstract
Arabidopsis seedling photomorphogenesis involves two antagonistically acting components, COP1 and HY5. COP1 specifically targets HY5 for degradation via the 26S proteasome in the dark through their direct physical interaction. Little is known regarding how light signals perceived by photoreceptors are transduced to regulate COP1. Arabidopsis has two related cryptochromes (cry1 and cry2) mediating various blue/ultraviolet-A light responses. Here we show that both photoactivated cryptochromes repress COP1 activity through a direct protein-protein contact and that this direct regulation is primarily responsible for the cryptochrome-mediated blue light regulation of seedling photomorphogenic development and genome expression profile.
Publication types
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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.
MeSH terms
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Arabidopsis / genetics
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Arabidopsis / growth & development*
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Arabidopsis / metabolism*
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Arabidopsis Proteins*
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Basic-Leucine Zipper Transcription Factors
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Carrier Proteins / chemistry
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Carrier Proteins / genetics
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Carrier Proteins / metabolism*
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Cell Nucleus / metabolism
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Crosses, Genetic
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Cryptochromes
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Darkness
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Drosophila Proteins*
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Expressed Sequence Tags
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Eye Proteins*
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Flavoproteins / genetics
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Flavoproteins / metabolism*
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Gene Expression Profiling
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Gene Expression Regulation, Plant
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Genes, Plant
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Light*
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Morphogenesis
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Mutation
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Nuclear Proteins / metabolism
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Oxidation-Reduction
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Phenotype
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Photoreceptor Cells, Invertebrate*
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Plant Proteins / chemistry
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Plant Proteins / genetics
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Plant Proteins / metabolism*
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Plants, Genetically Modified
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Precipitin Tests
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Protein Binding
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Protein Structure, Tertiary
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Receptors, G-Protein-Coupled
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Recombinant Fusion Proteins / metabolism
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Signal Transduction
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Ubiquitin-Protein Ligases*
Substances
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Arabidopsis Proteins
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Basic-Leucine Zipper Transcription Factors
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CRY1 protein, Arabidopsis
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Carrier Proteins
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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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HY5 protein, Arabidopsis
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Nuclear Proteins
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Plant Proteins
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Receptors, G-Protein-Coupled
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Recombinant Fusion Proteins
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cry protein, Drosophila
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AT2G32950 protein, Arabidopsis
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Ubiquitin-Protein Ligases