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Journal of Bacteriology, December 1998, p. 6761-6763, Vol. 180, No. 24
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Nitrite-Specific Active Transport System of the Cyanobacterium Synechococcus sp. Strain PCC 7942

Shin-ichi Maeda, Masato Okamura, Masaki Kobayashi, and Tatsuo Omata*

Department of Applied Biological Sciences, School of Agricultural Sciences, Nagoya University, Nagoya 464-8601, Japan

Received 8 June 1998/Accepted 13 October 1998

Studies on the nitrite uptake capability of a mutant of Synechococcus sp. strain PCC 7942 lacking the ATP-binding cassette-type nitrate-nitrite-bispecific transporter revealed the occurrence of a nitrite-specific active transport system with an apparent Km (NO2-) of about 20 µM. Similar to the nitrate-nitrite-bispecific transporter, the nitrite-specific transporter was reversibly inhibited by ammonium in the medium.

* Corresponding author. Mailing address: Department of Applied Biological Sciences, School of Agricultural Sciences, Nagoya University, Nagoya 464-8601, Japan. Phone: 81-52-789-4106. Fax: 81-52-789-4104. E-mail: omata{at}agr.nagoya-v.ac.jp.

Journal of Bacteriology, December 1998, p. 6761-6763, Vol. 180, No. 24
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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