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• W1964600830 endingPage "2029" @default.
• W1964600830 startingPage "2020" @default.
• W1964600830 abstract "ABSTRACT The gram-positive, thermophilic, acetogenic bacterium Moorella thermoacetica can reduce CO 2 to acetate via the Wood-Ljungdahl (acetyl coenzyme A synthesis) pathway. This report demonstrates that, despite its classification as a strict anaerobe, M. thermoacetica contains a membrane-bound cytochrome bd oxidase that can catalyze reduction of low levels of dioxygen. Whole-cell suspensions of M. thermoacetica had significant endogenous O 2 uptake activity, and this activity was increased in the presence of methanol or CO, which are substrates in the Wood-Ljungdahl pathway. Cyanide and azide strongly (∼70%) inhibited both the endogenous and CO/methanol-dependent O 2 uptake. UV-visible light absorption and electron paramagnetic resonance spectra of n -dodecyl-β-maltoside extracts of M. thermoacetica membranes showed the presence of a cytochrome bd oxidase complex containing cytochrome b 561 , cytochrome b 595 , and cytochrome d (chlorin). Subunits I and II of the bd oxidase were identified by N-terminal amino acid sequencing. The M. thermoacetica cytochrome bd oxidase exhibited cyanide-sensitive quinol oxidase activity. The M. thermoacetica cytochrome bd ( cyd ) operon consists of four genes, encoding subunits I and II along with two ABC-type transporter proteins, homologs of which in other bacteria are required for assembly of the bd complex. The level of this cyd operon transcript was significantly increased when M. thermoacetica was grown in the absence of added reducing agent (cysteine + H 2 S). Expression of a 35-kDa cytosolic protein, identified as a cysteine synthase (CysK), was also induced by the nonreducing growth conditions. The combined evidence indicates that cytochrome bd oxidase and cysteine synthase protect against oxidative stress and contribute to the limited dioxygen tolerance of M. thermoacetica ." @default.
• W1964600830 created "2016-06-24" @default.
• W1964600830 creator A5006786155 @default.
• W1964600830 creator A5010373023 @default.
• W1964600830 creator A5048391102 @default.
• W1964600830 creator A5062951249 @default.
• W1964600830 date "2005-03-15" @default.
• W1964600830 modified "2023-10-16" @default.
• W1964600830 title "Cytochrome <i>bd</i> Oxidase, Oxidative Stress, and Dioxygen Tolerance of the Strictly Anaerobic Bacterium <i>Moorella thermoacetica</i>" @default.
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• W1964600830 doi "https://doi.org/10.1128/jb.187.6.2020-2029.2005" @default.
• W1964600830 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1064043" @default.
• W1964600830 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15743950" @default.
• W1964600830 hasPublicationYear "2005" @default.
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