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Plant and Cell Physiology Advance Access published online on April 17, 2006
Plant and Cell Physiology, doi:10.1093/pcp/pcj052
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Plant and Cell Physiology 2006 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received April 1, 2006
Accepted April 12, 2006

Short Communication

Mutations in a Putative Chloride Efflux Transporter Gene Suppress the Chloride Requirement of the Photosystem II in the Cytochrome C550 Deficient Mutant

Mari Kobayashi 1 *, Hiroshi Katoh 2, and Masahiko Ikeuchi 3

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

* To whom correspondence should be addressed.
Mari Kobayashi, E-mail: teru{at}iam.u-tokyo.ac.jp.


  Abstract

The cytochrome c550-deficient mutant (psbV-disruptant) of Synechocystis requires high concentration of Cl- in culture media 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 deletion in slr0753 and two were 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 related anion, which is essential for Photosystem II oxygen evolution.

Keywords: chloride; cyanobacterium; Insertion Sequence; psbV; slr0753; transporter.
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