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Related Experiment Videos

Studies on methanol - oxidizing yeast. III. Enzyme.

O Volfová

    Folia Microbiologica
    |January 1, 1975
    PubMed
    Summary

    Candida boidinii yeast oxidizes methanol using inducible methanol oxidase and constitutive catalase. These enzymes, particularly methanol oxidase, show specific activity and substrate preferences, with catalase being more pH-stable.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Microbial Metabolism

    Background:

    • Methanol metabolism in yeasts is crucial for understanding their biochemical pathways.
    • Candida boidinii is known for its ability to utilize C1 compounds.
    • Characterizing the enzymes involved in methanol oxidation provides insights into microbial catabolism.

    Purpose of the Study:

    • To investigate the enzymes responsible for methanol, formaldehyde, and formic acid oxidation in Candida boidinii.
    • To determine the properties and characteristics of methanol oxidase and catalase in this yeast.
    • To elucidate the roles of these enzymes in the yeast's metabolic processes.

    Main Methods:

    • Studying enzyme activity in both whole yeast cells and cell-free extracts.
    • Inducing enzyme formation by adding methanol to yeast cultures.
    • Measuring enzyme kinetics, including optimal temperature, pH, and substrate affinity (Km).
    • Assessing enzyme inhibition using various chemical agents.
    • Analyzing the participation of catalase in methanol oxidation.

    Main Results:

    • Methanol oxidase, responsible for methanol to formaldehyde conversion, is inducible and has an optimal temperature of 35°C and pH of 8.5, with a Km of 0.8mM for methanol.
    • Methanol oxidase exhibits broad substrate specificity for primary alcohols (C1-C6) and is inhibited by p-chloromercuribenzoate.
    • Catalase, constitutively formed, also participates in methanol oxidation and has an optimal pH of 8.5, showing greater stability at high pH than methanol oxidase.
    • Cell-free extracts contain GSH-dependent NAD-formaldehyde dehydrogenase (Km = 0.29mM) and NAD-formate dehydrogenase (Km = 55mM).

    Conclusions:

    • Methanol oxidation in Candida boidinii involves both inducible methanol oxidase and constitutive catalase.
    • The characterized enzymes display distinct kinetic properties and substrate specificities, contributing to efficient methanol catabolism.
    • Understanding these enzymatic pathways is vital for applications involving yeast-based biotransformation and C1 compound utilization.

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