P <sub>II</sub> -Regulated Arginine Synthesis Controls Accumulation of Cyanophycin in <i>Synechocystis</i> sp. Strain PCC 6803

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  • Mani Maheswaran
    Institut für Mikrobiologie und Molekularbiologie, Justus-Liebig Universität Giessen, Heinrich-Buff-Ring 26-32, D-35392 Giessen, Germany
  • Karl Ziegler
    Institut für Biologie, Humboldt-Universität zu Berlin, Chausseestr. 117, D-10115 Berlin, Germany
  • Wolfgang Lockau
    Institut für Biologie, Humboldt-Universität zu Berlin, Chausseestr. 117, D-10115 Berlin, Germany
  • Martin Hagemann
    Abteilung Pflanzenphysiologie, Universität Rostock, Albert-Einstein-Str. 3, D-18051 Rostock, Germany
  • Karl Forchhammer
    Institut für Mikrobiologie und Molekularbiologie, Justus-Liebig Universität Giessen, Heinrich-Buff-Ring 26-32, D-35392 Giessen, Germany

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<jats:title>ABSTRACT</jats:title> <jats:p> Cyanophycin (multi- <jats:sc>l</jats:sc> -arginyl-poly- <jats:sc>l</jats:sc> -aspartic acid) is a nitrogen storage polymer found in most cyanobacteria and some heterotrophic bacteria. The cyanobacterium <jats:italic>Synechocystis</jats:italic> sp. strain PCC 6803 accumulates cyanophycin following a transition from nitrogen-limited to nitrogen-excess conditions. Here we show that the accumulation of cyanophycin depends on the activation of the key enzyme of arginine biosynthesis, <jats:italic>N</jats:italic> -acetyl- <jats:sc>l</jats:sc> -glutamate kinase, by signal transduction protein P <jats:sub>II</jats:sub> . </jats:p>

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