Journal Article

Mutations in a Putative Chloride Efflux Transporter Gene Suppress the Chloride Requirement of Photosystem II in the Cytochrome c550-deficient Mutant

Mari Kobayashi, Hiroshi Katoh and Masahiko Ikeuchi

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 47, issue 6, pages 799-804
Published in print June 2006 | ISSN: 0032-0781
Published online June 2006 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcj052
Mutations in a Putative Chloride Efflux Transporter Gene Suppress the Chloride Requirement of Photosystem II in the Cytochrome c550-deficient Mutant

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The cytochrome c550-deficient mutant (psbV-disruptant) of Synechocystis requires a high concentration of Cl in the culture medium to support photosynthetic oxygen evolution. From this disruptant, we isolated spontaneous suppressor mutants that are able to grow photoautotrophically in the absence of Cl. Three independent mutations were identified: one was a deletion in slr0753 and two were a transposition of related insertion sequences in the same slr0753. The deduced product of slr0753 belongs to a novel group of the superfamily of ion efflux pumps and ion transporters. These results suggest that Slr0753 exports Cl or a related anion, which is essential for PSII oxygen evolution.

Keywords: Chloride; Cyanobacterium; Insertion sequence; psbV; slr0753; Transporter

Journal Article.  3307 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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