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    J Bacteriol. 1990 Sep;172(9):4927-35.

    Role of NAD-linked glutamate dehydrogenase in nitrogen metabolism in Saccharomyces cerevisiae.

    Miller SM, Magasanik B.

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    Department of Biology, Massachusetts Institute of Technology, Cambridge 02139.

    Abstract

    We cloned GDH2, the gene that encodes the NAD-linked glutamate dehydrogenase in the yeast Saccharomyces cerevisiae, by purifying the enzyme, making polyclonal antibodies to it, and using the antibodies to screen a lambda gt11 yeast genomic library. A yeast strain with a deletion-disruption allele of GDH2 which replaced the wild-type gene grew very poorly with glutamate as a nitrogen source, but growth improved significantly when the strain was also provided with adenine or other nitrogenous compounds whose biosynthesis requires glutamine. Our results indicate that the NAD-linked glutamate dehydrogenase catalyzes the major, but not sole, pathway for generation of ammonia from glutamate. We also isolated yeast mutants that lacked glutamate synthase activity and present evidence which shows that normally NAD-linked glutamate dehydrogenase is not involved in glutamate biosynthesis, but that if the enzyme is overexpressed, it may function reversibly in intact cells.

    PMID:
    1975578
    [PubMed - indexed for MEDLINE]
    PMCID:
    PMC213147
    Free PMC Article

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