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A cyanobacterial phytochrome two-component light sensory system

K C Yeh1, S H Wu, J T Murphy

  • 1Section of Molecular and Cellular Biology, University of California, Davis, CA 95616, USA.

Science (New York, N.Y.)
|September 5, 1997
PubMed
Summary

Phytochrome, a plant light sensor, evolved from ancient cyanobacterial histidine kinases. This study shows its light signaling involves reversible protein phosphorylation, a key step in early light signal transduction.

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Area of Science:

  • Plant biology
  • Biochemistry
  • Microbiology

Background:

  • Phytochrome regulates plant growth in response to light.
  • The precise mechanism of phytochrome light signaling remains largely unknown.
  • Phytochrome is an ancient molecule with evolutionary roots in cyanobacteria.

Purpose of the Study:

  • To investigate the evolutionary origins of phytochrome.
  • To elucidate the initial steps of light signal transduction mediated by phytochrome.
  • To understand the role of protein phosphorylation in phytochrome function.

Main Methods:

  • Biochemical analyses of phytochrome and its associated proteins.
  • Comparative evolutionary studies of light sensing mechanisms.
  • Investigating phosphorylation and dephosphorylation events.

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Main Results:

  • Phytochrome evolved from a more compact light sensor found in cyanobacteria.
  • Cyanobacterial phytochrome Cph1 functions as a light-regulated histidine kinase.
  • Cph1 mediates reversible phosphorylation of the response regulator Rcp1.

Conclusions:

  • Protein phosphorylation-dephosphorylation is implicated in the initial light signal transduction by phytochrome.
  • The study provides insights into the ancient mechanism of light sensing.
  • Understanding phytochrome signaling is crucial for plant development and growth regulation.