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

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Science  28 May 1999:
Vol. 284, Issue 5419, pp. 1539-1541
DOI: 10.1126/science.284.5419.1539

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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.

  • * Present address: Monsanto Company, 700 Chesterfield Parkway, North St. Louis, MO 63198, USA.

  • To whom correspondence should be addressed. E-mail: chory{at}

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