Abstract
The biliprotein phytochrome regulates plant growth and developmental responses to the ambient light environment through an unknown mechanism. Biochemical analyses demonstrate that phytochrome is an ancient molecule that evolved from a more compact light sensor in cyanobacteria. The cyanobacterial phytochrome Cph1 is a light-regulated histidine kinase that mediates red, far-red reversible phosphorylation of a small response regulator, Rcp1 (response regulator for cyanobacterial phytochrome), encoded by the adjacent gene, thus implicating protein phosphorylation-dephosphorylation in the initial step of light signal transduction by phytochrome.
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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Amino Acid Sequence
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Bacterial Proteins*
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Cloning, Molecular
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Cyanobacteria / chemistry
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Cyanobacteria / genetics
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Cyanobacteria / metabolism*
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Genes, Bacterial
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Histidine Kinase
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Light*
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Molecular Sequence Data
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Operon
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Phosphorylation
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Protein Kinases / chemistry
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Protein Kinases / genetics
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Protein Kinases / metabolism*
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Proteins
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Recombinant Fusion Proteins / chemistry
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Recombinant Fusion Proteins / metabolism
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Sequence Deletion
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Signal Transduction
Substances
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Bacterial Proteins
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Proteins
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Rcp1 protein, Synechocystis
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Recombinant Fusion Proteins
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Protein Kinases
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Histidine Kinase