title: Loss of cytochrome c oxidase activity and acquisition of resistance to quinone analogs in a laccase-positive variant of Azospirillum lipoferum.
abstract: Laccase, a p-diphenol oxidase typical of plants and fungi, has been found recently in a proteobacterium, Azospirillum lipoferum. Laccase activity was detected in both a natural isolate and an in vitro-obtained phase variant that originated from the laccase-negative wild type. In this study, the electron transport systems of the laccase-positive variant and its parental laccase-negative forms were compared. During exponential (but not stationary) growth under fully aerobic (but not under microaerobic) conditions, the laccase-positive variant lost a respiratory branch that is terminated in a cytochrome c oxidase of the aa(3) type; this was most likely due to a defect in the biosynthesis of a heme component essential for the oxidase. The laccase-positive variant was significantly less sensitive to the inhibitory action of quinone analogs and fully resistant to inhibitors of the bc(1) complex, apparently due to the rearrangements of its respiratory system. We propose that the loss of the cytochrome c oxidase-containing branch in the variant is an adaptive strategy to the presence of intracellular oxidized quinones, the products of laccase activity.
authors.affiliation: Laboratoire d'Ecologie Microbienne du Sol, CNRS-UMR 5557, l'Universite Claude-Bernard, 69622 Villeurbanne Cedex, France.
authors.forename: G
authors.initials: G
authors.lastname: Alexandre
authors.forename: R
authors.initials: R
authors.lastname: Bally
authors.forename: B L
authors.initials: BL
authors.lastname: Taylor
authors.forename: I B
authors.initials: IB
authors.lastname: Zhulin
mesh_terms: D016949:Azospirillum / Q000187:drug effects* / Q000201:enzymology* / Q000254:growth & development; D016227:Benzoquinones / Q000494:pharmacology*; D002851:Chromatography, High Pressure Liquid; D004352:Drug Resistance, Microbial; D004579:Electron Transport; D003576:Electron Transport Complex IV / Q000378:metabolism*; D006418:Heme / Q000032:analysis; D042845:Laccase; D008565:Membrane Proteins / Q000737:chemistry; D010088:Oxidoreductases / Q000378:metabolism*; D010101:Oxygen Consumption; D013057:Spectrum Analysis
chemical_list: D016227:Benzoquinones; D008565:Membrane Proteins; D006418:Heme; D010088:Oxidoreductases; D042845:Laccase; D003576:Electron Transport Complex IV