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Phytochromes as light-modulated protein kinases.

¹Department of Molecular Biology, University of Geneva, 30 quai E. Ansermet, Geneva 4, 1211, Switzerland. Christian.Fankhauser@molbio.unige.ch

Seminars in Cell & Developmental Biology

|January 9, 2001

Summary

Plant phytochromes, regulators of light responses, are now confirmed as light-regulated protein kinases. Recent research, using purified recombinant phytochrome and prokaryotic discoveries, solidifies this long-debated finding.

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Area of Science:

Plant biology
Molecular biology
Biochemistry

Background:

Phytochrome responses are mediated by light, leading to hypotheses of phytochromes as light-regulated enzymes over 40 years ago.
Early research suggested oat phytochrome possessed protein kinase activity, but this remained debated due to insufficient evidence.

Purpose of the Study:

To review the key discoveries establishing phytochrome's protein kinase activity.
To explore the role of this kinase activity in plant photomorphogenesis.

Main Methods:

Production of highly purified, biologically active recombinant phytochrome.
Discovery and characterization of phytochromes in prokaryotes.

Main Results:

Recent solid experimental data confirms phytochrome's light-regulated protein kinase activity.

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Advances in recombinant protein production and prokaryotic phytochrome research were crucial.

Conclusions:

Phytochromes function as light-regulated protein kinases, a finding with significant implications for understanding plant photomorphogenesis.
Further research is needed to elucidate the specific roles of phytochrome kinase activity in developmental processes.