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Related Experiment Videos

Galactose catabolism in Caulobacter crescentus.

N Kurn, I Contreras, L Shapiro

    Journal of Bacteriology
    |August 1, 1978
    PubMed
    Summary

    Caulobacter crescentus utilizes galactose via the Entner-Duodoroff pathway, requiring cyclic AMP for wild-type growth. Mutants demonstrate galactose catabolism independent of cyclic nucleotides.

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    Area of Science:

    • Microbiology
    • Biochemistry
    • Bacterial metabolism

    Background:

    • Caulobacter crescentus wild-type strain CB13 requires cyclic AMP derivatives for galactose utilization.
    • Spontaneous mutants capable of growing on galactose without cyclic nucleotides were isolated.

    Purpose of the Study:

    • To elucidate the galactose catabolism pathway in Caulobacter crescentus.
    • To investigate the regulation of galactose metabolism and uptake.

    Main Methods:

    • Isolation and characterization of spontaneous galactose-utilizing mutants.
    • Enzyme assays for galactose dehydrogenase and 2-keto-3-deoxy-6-phosphogalactonate aldolase.
    • Analysis of enzyme induction and regulation.

    Main Results:

    • Caulobacter crescentus employs the Entner-Duodoroff pathway for galactose catabolism.
    • Galactose is converted to galactonate by galactose dehydrogenase.
    • 2-keto-3-deoxy-6-phosphogalactonate aldolase catalyzes the hydrolysis of 2-keto-3-deoxy-6-phosphogalactonic acid.
    • Galactose catabolic enzymes are inducible and independently regulated.
    • Galactose uptake is regulated independently of catabolic enzymes.

    Conclusions:

    • The Entner-Duodoroff pathway is the primary route for galactose catabolism in C. crescentus.
    • Galactose metabolism involves inducible and independently regulated enzymes.
    • Galactose uptake and catabolism are under distinct regulatory control.

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