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Applied and Environmental Microbiology, February 2002, p. 985-988, Vol. 68, No. 2
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.2.985-988.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

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

Jun Sun,1 Anne Van Dommelen,1 Jan Van Impe,2 and Jos Vanderleyden1*

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 PII protein), glnZ (encoding the Pz 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 PII-Pz system is apparently involved in nitrogen-dependent regulation of PHB biosynthesis in A. brasilense Sp7.

* Corresponding author. Mailing address: Centre of Microbial and Plant Genetics, K.U. Leuven, Kasteelpark Arenberg 20, B-3001 Heverlee, Belgium. Phone: 0032-16-321631. Fax: 0032-16-321966. E-mail: jozef.vanderleyden{at}agr.kuleuven.ac.be.

Applied and Environmental Microbiology, February 2002, p. 985-988, Vol. 68, No. 2
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.2.985-988.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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