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J. Biol. Chem. 276 (34): 32169-32176

© 2001 by The American Society for Biochemistry and Molecular Biology, Inc.

Disruption of Thylakoid-associated Kinase 1 Leads to Alteration of Light Harvesting in Arabidopsis*

Shaun Snyders and Bruce D. KohornDagger

From the Department of Biology, Duke University, Durham, North Carolina 27708

To survive fluctuations in quality and intensity of light, plants and algae are able to preferentially direct the absorption of light energy to either one of the two photosystems, PSI or PSII. This rapid process is referred to as a state transition and has been correlated with the phosphorylation and migration of the light-harvesting complex protein (LHCP) between PSII and PSI. We show here that thylakoid protein kinases (TAKs) are required for state transitions in Arabidopsis. Antisense TAK1 expression leads to a loss of LHCP phosphorylation and a reduction in state transitions. Preferential activation of PSII causes LHCP to accumulate with PSI, and TAK1 mutants disrupt this process. Finally, TAKs also influence the phosphorylation of multiple thylakoid proteins.


* This work was supported by the U.S. Department of Agriculture and the Pew Charitable Trusts.The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

Dagger To whom correspondence should be addressed: Dept. of Biology, Rm. B353 LSRC, DCMB, Duke University, Durham, NC 27708. Tel.: 919-613-8177; Fax: 919-613-8182; E-mail: kohorn@duke.edu.


Copyright © 2001 by The American Society for Biochemistry and Molecular Biology, Inc.

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