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Folate Biosynthesis, Reduction, and Polyglutamylation and the Interconversion of Folate Derivatives.

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    This review details the de novo synthesis of folic acid derivatives, focusing on dihydrofolate and tetrahydrofolate formation. It highlights how bacteria like E. coli are susceptible to folate biosynthesis inhibitors.

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    Area of Science:

    • Biochemistry
    • Microbiology
    • Molecular Biology

    Background:

    • Microorganisms and plants synthesize folic acid derivatives de novo.
    • Tetrahydrofolate is crucial for one-carbon unit transfer, derived from dihydrofolate reduction.
    • Folylpolyglutamates are essential derivatives with varying glutamate chain lengths.

    Purpose of the Study:

    • To review the biosynthesis of dihydrofolate and tetrahydrofolate.
    • To discuss the formation and function of folylpolyglutamates.
    • To examine the susceptibility of certain bacteria to folate biosynthesis inhibitors.

    Main Methods:

    • Discussion of enzymatic pathways for folate synthesis.
    • Analysis of dihydrofolate reductase (FolA) and folylpolyglutamate synthetase (folC) functions.
    • Review of bacterial folate transport mechanisms and inhibitor susceptibility.

    Main Results:

    • Folate biosynthesis involves conversion of chorismate to PABA and pteridine synthesis from GTP.
    • Dihydrofolate synthetase (folC) adds the initial glutamate to form dihydrofolate.
    • Bacteriophage T4 infection alters folate metabolism, increasing folylpolyglutamate chain lengths.

    Conclusions:

    • Escherichia coli and Salmonella lack folate transport, making them vulnerable to folate biosynthesis inhibitors.
    • Understanding folate biosynthesis is key to developing antimicrobial strategies.
    • Folate metabolism is complex and subject to regulation, as shown by phage infection effects.