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Plant and Cell Physiology, 2002, Vol. 43, No. 12 1585-1588
© 2002 Oxford University Press

Short Communications

Bipolar Localization of Putative Photoreceptor Protein for Phototaxis in Thermophilic Cyanobacterium Synechococcus elongatus

Youichi Kondou1, Norifumi Mogami1, Fumiko Hoshi1, Shinsuke Kutsuna1, Miki Nakazawa2, Tetsuya Sakurai2, Minami Matsui2, Takakazu Kaneko3, Satoshi Tabata3, Ichiro Tanaka1 and Katsushi Manabe1,4

1 Graduate School of Integrated Science, Yokohama City University, Seto 22–2, Kanazawa-ku, Yokohama, 236-0027 Japan
2 Plant Function Exploration Team, Plant Functional Genomics Research Group, Riken, Genomics Sciences Center, Suyehiro-cho 1-7-22, Tsurumi-ku, Yokohama, 230-0045 Japan
3 Department of Plant Gene Research, Kazusa DNA Research Institute, Yana 1532-3, Kisarazu, 292-0812 Japan

Abstract

We identified an open reading frame from a database of the entire genome of Synechococcus elongatus, the product of which was very similar to pixJ1, which was proposed as photoreceptor gene for phototaxis in Synechocystis sp. PCC6803 [Yoshihara et al. (2000) Plant Cell Physiol. 41: 1299]. The mRNA of S. elongatus pixJ (SepixJ) was expressed in vivo as a part of the product of an operon. SePixJ was detected exclusively in the membrane fraction after cell fractionation. Immunogold labeling of SePixJ in ultra-thin sections indicated that it existed only in both ends of the rod-shaped cell; probably bound with the cytoplasmic membrane.

Footnotes

4 Corresponding author: E-mail, kmanabe@yokohama-cu.ac.jp; Fax, +81-45-787-2211.


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