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Science 28 May 1999:
Vol. 284. no. 5419, pp. 1539 - 1541
DOI: 10.1126/science.284.5419.1539
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Reports

PKS1, a Substrate Phosphorylated by Phytochrome That Modulates Light Signaling in Arabidopsis

Christian Fankhauser, 1 Kuo-Chen Yeh, 3 J. Clark , Lagarias, 3 Hong Zhang, 4 Tedd D. Elich, 1* Joanne Chory 12dagger

Plants constantly monitor their light environment in order to grow and develop optimally, in part through use of the phytochromes, which sense red/far-red light. A phytochrome binding protein, PKS1 (phytochrome kinase substrate 1), was identified that is a substrate for light-regulated phytochrome kinase activity in vitro. In vivo experiments suggest that PKS1 is phosphorylated in a phytochrome-dependent manner and negatively regulates phytochrome signaling. The data suggest that phytochromes signal by serine-threonine phosphorylation.

1 Plant Biology Laboratory,
2 Howard Hughes Medical Institute, Salk Institute, La Jolla, CA 92037, USA.
3 Section of Molecular and Cellular Biology, University of California, Davis, CA 95616, USA.
4 Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA.
*   Present address: Monsanto Company, 700 Chesterfield Parkway, North St. Louis, MO 63198, USA.

dagger    To whom correspondence should be addressed. E-mail: chory{at}salk.edu

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