title: Involvement of glnB, glnZ, and glnD genes in the regulation of poly-3-hydroxybutyrate biosynthesis by ammonia in Azospirillum brasilense Sp7.
abstract: 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.
authors.affiliation: Centre of Microbial and Plant Genetics. BioTeC-Bioprocess Technology and Control, Katholieke Universiteit Leuven, Kasteelpark Arenburg 20, B-3001 Heverlee, Belgium.
authors.forename: Jun
authors.initials: J
authors.lastname: Sun
authors.forename: Anne
authors.initials: A
authors.lastname: Van Dommelen
authors.forename: Jan
authors.initials: J
authors.lastname: Van Impe
authors.forename: Jozef
authors.initials: J
authors.lastname: Vanderleyden
mesh_terms: D000641:Ammonia / Q000378:metabolism*; D015806:Azospirillum brasilense / Q000235:genetics / Q000378:metabolism*; D001426:Bacterial Proteins / Q000235:genetics* / Q000378:metabolism; D003470:Culture Media; D015964:Gene Expression Regulation, Bacterial; D006885:Hydroxybutyrates / Q000378:metabolism*; D009154:Mutation; D009713:Nucleotidyltransferases / Q000235:genetics / Q000378:metabolism; D051922:PII Nitrogen Regulatory Proteins; D011091:Polyesters / Q000378:metabolism*; D000094122:Polyhydroxybutyrates
chemical_list: D000641:Ammonia; D001426:Bacterial Proteins; D003470:Culture Media; D006885:Hydroxybutyrates; D009713:Nucleotidyltransferases; D051922:PII Nitrogen Regulatory Proteins; D011091:Polyesters; C100965:GlnZ protein, Azospirillum brasilense; C003182:poly-beta-hydroxybutyrate; D000094122:Polyhydroxybutyrates; C404143:PIID regulatory protein, Bacteria; C022515:regulatory protein uridylyltransferase