title: The PQQ biosynthetic operons and their transcriptional regulation in Pseudomonas aeruginosa.
abstract: Gene PA1990 of Pseudomonas aeruginosa, located downstream of pqqE and encoding a putative peptidase, was shown to be involved in excretion of PQQ into the culture supernatant. This gene is cotranscribed with the pqqABCDE cluster and was named pqqH. A PA1990::Km(r) mutant (VK3) did not show any effect in growth behaviour; however, in contrast to the wild-type, no excretion of PQQ into the culture supernatant was observed. The putative pqqF gene of P. aeruginosa was shown to be essential for PQQ biosynthesis. A pqqF::Km(r) mutant did not grow aerobically on ethanol, because of its inability to produce PQQ. Transcription of the pqqABCDEH operon was induced upon aerobic growth on ethanol, 1-propanol, 1,2-propanediol and 1-butanol, while on glycerol, succinate and acetate, transcription was low. Transcription of the pqqABCDEH operon was also found upon anoxic growth on ethanol with nitrate as electron acceptor, but no PQQ was produced. Expression of the pqqABCDEH operon is regulated at the transcriptional level. In contrast, the pqqF operon appeared to be transcribed constitutively at a very low level under all growth conditions studied.
authors.affiliation: BioGenes GmbH, Koepenicker Strasse 325, Berlin, Germany.
authors.forename: Nicole
authors.initials: N
authors.lastname: Gliese
authors.forename: Viola
authors.initials: V
authors.lastname: Khodaverdi
authors.forename: Helmut
authors.initials: H
authors.lastname: Görisch
mesh_terms: D020001:1-Butanol / Q000378:metabolism; D000433:1-Propanol / Q000378:metabolism; D001425:Bacterial Outer Membrane Proteins / Q000235:genetics / Q000378:metabolism; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism; D004251:DNA Transposable Elements; D004269:DNA, Bacterial / Q000235:genetics / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D005816:Genetic Complementation Test; D005810:Multigene Family; D009154:Mutation; D009876:Operon; D045542:PQQ Cofactor / Q000096:biosynthesis*; D011401:Promoter Regions, Genetic; D019946:Propylene Glycol / Q000378:metabolism; D011550:Pseudomonas aeruginosa / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism; D011808:Quinone Reductases / Q000235:genetics / Q000378:metabolism; D012329:RNA, Bacterial / Q000235:genetics / Q000378:metabolism; D014158:Transcription, Genetic
chemical_list: D001425:Bacterial Outer Membrane Proteins; D001426:Bacterial Proteins; D004251:DNA Transposable Elements; D004269:DNA, Bacterial; D012329:RNA, Bacterial; D019946:Propylene Glycol; D045542:PQQ Cofactor; D020001:1-Butanol; D000433:1-Propanol; D011808:Quinone Reductases