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Plant Cell, Vol. 11, 2031-2044, October 1999, Copyright © 1999, American Society of Plant Physiologists
Analysis of the Nucleus-Encoded and Chloroplast-Targeted Rieske Protein by Classic and Site-Directed Mutagenesis of Chlamydomonas
Catherine de Vitrya,
Giovanni Finazzib,
Frauke Baymanna, and
Toivo Kallasc
a Physiologie Membranaire et Moléculaire du Chloroplaste, Centre National de la Recherche Scientifique UPR1261, Institut de Biologie Physico-Chimique, 13 rue Pierre et Marie Curie, 75005 Paris, France
b Centro Nazionale della Ricerca, Biologia Cellulare e Moleculare della Plante, Milan, Italy
c Department of Biology and Microbiology, University of Wisconsin, Oshkosh, Wisconsin 54901
Correspondence to:
Catherine de Vitry, devitry{at}ibpc.fr (E-mail), 331-1-40-46-83-31 (fax)
Three mutants of the alga Chlamydomonas reinhardtii affected in the nuclear PETC gene encoding the Rieske iron–sulfur protein 2Fe–2S subunit of the chloroplast cytochrome b6f complex have been characterized. One has a stable deletion that eliminates the protein; two others carry substitutions Y87D and W163R that result in low accumulation of the protein. Attenuated expression of the stromal protease ClpP increases accumulation and assembly into b6f complexes of the Y87D and W163R mutant Rieske proteins in quantities sufficient for analysis. Electron-transfer kinetics of these complexes were 10- to 20-fold slower than those for the wild type. The deletion mutant was used as a recipient for site-directed mutant petC alleles. Six glycine residues were replaced by alanine residues (6G6A) in the flexible hinge that is critical for domain movement; substitutions were created near the 2Fe–2S cluster (S128 and W163); and seven C-terminal residues were deleted (G171och). Although the 6G6A and G171och mutations affect highly conserved segments in the chloroplast Rieske protein, photosynthesis in the mutants was similar to that of the wild type. These results establish the basis for mutational analysis of the nuclear-encoded and chloroplast-targeted Rieske protein of photosynthesis.
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