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Related Experiment Videos

Substrate specificity of CTP-synthetase from E. coli

K H Scheit, H J Linke

    Nucleic Acids Symposium Series
    |January 1, 1981
    PubMed
    Summary

    Investigating uridine triphosphate (UTP) analogs revealed key structural elements crucial for E. coli CTP-synthetase activity. The enzyme requires the beta-D-ribose 5-triphosphate moiety, and larger UTP substitutions abolish function.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Molecular Biology

    Background:

    • Cytidine triphosphate (CTP) synthetase is a vital enzyme in nucleotide biosynthesis.
    • Understanding enzyme substrate specificity is crucial for metabolic pathway regulation and drug development.

    Purpose of the Study:

    • To elucidate the substrate specificity of CTP-synthetase from Escherichia coli (E. coli).
    • To identify the essential structural components of uridine triphosphate (UTP) required for CTP-synthetase activity.

    Main Methods:

    • Utilized various uridine triphosphate (UTP) analogs to probe enzyme-substrate interactions.
    • Analyzed the impact of structural modifications on UTP's ability to act as a substrate for CTP-synthetase.

    Main Results:

    • CTP-synthetase demonstrated a strict requirement for the beta-D-ribose 5-triphosphate portion of UTP.
    • Substitutions at the 5-position of UTP, larger than a tritium atom, rendered the molecule non-functional as a substrate.

    Conclusions:

    • The beta-D-ribose 5-triphosphate moiety is indispensable for UTP recognition by E. coli CTP-synthetase.
    • Steric hindrance at the UTP 5-position significantly impacts substrate binding and enzyme activity, highlighting precise structural requirements.

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