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Related Experiment Videos

"Active" one-carbon generation in Saccharomyces cerevisiae.

M Ogur, T N Liu, I Cheung

    Journal of Bacteriology
    |February 1, 1977
    PubMed
    Summary

    A new mutation in yeast (ser1) revealed that glycine decarboxylase is essential for growth, as it requires a one-carbon source like formate. Other enzyme activities did not compensate for this deficiency.

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    Area of Science:

    • Biochemistry
    • Yeast Genetics
    • Metabolic Pathways

    Background:

    • Serine-glycine auxotrophs (ser1) in Saccharomyces exhibit complex nutritional requirements.
    • Understanding one-carbon metabolism is crucial for yeast growth and cellular functions.

    Purpose of the Study:

    • To investigate the role of glycine decarboxylase in Saccharomyces.
    • To determine the necessity of one-carbon supplementation for specific yeast mutants.
    • To elucidate the relationship between different decarboxylase activities and growth requirements.

    Main Methods:

    • Genetic analysis of yeast mutants.
    • Correlation of specific mutations with enzyme activities (glycine decarboxylase, oxalate decarboxylase, glyoxylate decarboxylase).
    • Growth assays with supplemented media (glycine, one-carbon sources).

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    Main Results:

    • A mutation (ser1) requiring a one-carbon source (formate) for growth was linked to absent glycine decarboxylase activity.
    • Neither oxalate decarboxylase nor glyoxylate decarboxylase activity could fulfill this one-carbon requirement.
    • A mutation lacking oxalate decarboxylase activity did not impose a one-carbon requirement.

    Conclusions:

    • Glycine decarboxylase activity is essential for Saccharomyces growth.
    • This enzyme plays a significant physiological role in yeast metabolism.
    • The one-carbon requirement in ser1 mutants is specifically due to the lack of glycine decarboxylase.