Abstract
Oxidation of methanol, formaldehyde and formic acid was studied in cells and cell-free extract of the yeastCandida boidinii No. 11Bh. Methanol oxidase, an enzyme oxidizing methanol to formaldehyde, was formed inducibly after the addition of methanol to yeast cells. The oxidation of methanol by cell-free extract was dependent on the presence of oxygen and independent of any addition of nicotineamide nucleotides. Temperature optimum for the oxidation of methanol to formaldehyde was 35°C, pH optimum was 8.5. The Km for methanol was 0.8mM. The cell-free extract exhibited a broad substrate specificity towards primary alcohols (C1-C6). The activity of methanol oxidase was not inhibited by lnni KCN, EDTA or monoiodoacetic acid. The strongest inhibitory action was exerted byp-chloromercuribenzoate. Both the cells and the cell-free extract contained catalase which participated in the oxidation of m||ethanol to formaldehyde; the enzyme was constitutively formed by the yeast. The pH optimum for the degradation of H2O2 was in the same range as the optimum fop methanol oxidation,viz. at 8.5. Catalase was more resistant to high pH than methanol oxidase. The cell-free extract contained also GSH-dependent NAD-formaldehyde dehydrogenase with Km= 0.29mM and NAD-formate dehydrogenoae withK m = 55mM.
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Volfoá, O. Studies on methanol — oxidizing yeast. Folia Microbiol 20, 307–319 (1975). https://doi.org/10.1007/BF02878112
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DOI: https://doi.org/10.1007/BF02878112