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Plant and Cell Physiology Advance Access published online on July 18, 2006
Plant and Cell Physiology, doi:10.1093/pcp/pcj088
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© The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received May 10, 2006
Accepted July 3, 2006

Short Communication

Regulation of Nitrate Reductase by Non-Modifiable Derivatives of PII in the Cells of Synechococcus elongatus Strain PCC 7942

Nobuyuki Takatani 1, Masaki Kobayashi 1, Shin-ichi Maeda 1, and Tatsuo Omata 1 *

1 Laboratory of Molecular Plant Physiology, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan

* To whom correspondence should be addressed.
Tatsuo Omata, E-mail: omata{at}agr.nagoya-u.ac.jp


  Abstract

In Synechococcus elongatus, the PII protein inhibits both transport and reduction of nitrate when ammonium is present in the medium. Using a transporter mutant having ammonium-resistant nitrate transport activity as a genetic background, we analyzed specific effects of PII on in vivo nitrate reductase activity by measuring uptake of nitrate from medium. The results showed that the regulation of nitrate reductase does not require changes in the electric charge or size of the side chain at the phosphorylation site of PII. Phosphorylation of PII is thus unlikely to play a role in the regulation of nitrate reductase.

Keywords: Cyanobacterium; Nitrate assimilation; Nitrate reductase; PII protein; Post translational regulation; Synechococcus elongatus strain PCC 7942.
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