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Plant and Cell Physiology Advance Access originally published online on April 17, 2006
Plant and Cell Physiology 2006 47(6):799-804; doi:10.1093/pcp/pcj052
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Short Communication

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

Mari Kobayashi1,2,*, Hiroshi Katoh3 and Masahiko Ikeuchi1

1 Department of Life Sciences (Biology), The University of Tokyo, Komaba 3-8-1, Meguro, Tokyo, 153-8902 Japan
2 Institute of Molecular and Cellular Biosciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo, Tokyo, 113-0032 Japan
3 Division of Plant Functional Genomics, Life Science Research Center, Mie University, 1515, Kamihama, Tsu, Mie, 514-8507 Japan

* Corresponding author: E-mail, teru{at}iam.u-tokyo.ac.jp; Fax, +81-3-5841-8490.

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.

(Received April 1, 2006; Accepted April 12, 2006)
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