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Involvement of glnB, glnZ, and glnD Genes in the Regulation of Poly-3-Hydroxybutyrate Biosynthesis by Ammonia in Azospirillum brasilense Sp7

Centre of Microbial and Plant Genetics,¹ BioTeC—Bioprocess Technology and Control, Katholieke Universiteit Leuven, B-3001 Heverlee, Belgium²

Received 13 June 2001/ Accepted 8 November 2001

The role of three key nitrogen regulatory genes, glnB (encoding the P_II protein), glnZ (encoding the P_z protein), and glnD (encoding the GlnD protein), in regulation of poly-3-hydroxybutyrate (PHB) biosynthesis by ammonia in Azospirillum brasilense Sp7 was investigated. It was observed that glnB glnZ and glnD mutants produce substantially higher amounts of PHB than the wild type produces during the active growth phase. glnB and glnZ mutants have PHB production phenotypes similar to that of the wild type. Our results indicate that the P_II-P_z system is apparently involved in nitrogen-dependent regulation of PHB biosynthesis in A. brasilense Sp7.

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