A pigment-binding protein essential for regulation of photosynthetic light harvesting

Xiao-Ping Li, Olle Björkman, Connie Shih, Arthur R. Grossman, Magnus Rosenquist, Stefan Jansson and Krishna K. Niyogi ()
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Xiao-Ping Li: University of California
Olle Björkman: Carnegie Institution of Washington, Department of Plant Biology
Connie Shih: Carnegie Institution of Washington, Department of Plant Biology
Arthur R. Grossman: Carnegie Institution of Washington, Department of Plant Biology
Magnus Rosenquist: University of Umeå
Stefan Jansson: University of Umeå
Krishna K. Niyogi: University of California

Nature, 2000, vol. 403, issue 6768, 391-395

Abstract: Abstract Photosynthetic light harvesting in plants is regulated in response to changes in incident light intensity. Absorption of light that exceeds a plant's capacity for fixation of CO2 results in thermal dissipation of excitation energy in the pigment antenna of photosystem II by a poorly understood mechanism. This regulatory process, termed nonphotochemical quenching, maintains the balance between dissipation and utilization of light energy to minimize generation of oxidizing molecules, thereby protecting the plant against photo-oxidative damage. To identify specific proteins that are involved in nonphotochemical quenching, we have isolated mutants of Arabidopsis thaliana that cannot dissipate excess absorbed light energy. Here we show that the gene encoding PsbS, an intrinsic chlorophyll-binding protein of photosystem II, is necessary for nonphotochemical quenching but not for efficient light harvesting and photosynthesis. These results indicate that PsbS may be the site for nonphotochemical quenching, a finding that has implications for the functional evolution of pigment-binding proteins.

Date: 2000
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DOI: 10.1038/35000131

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