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Related Experiment Videos

Substrate specificity via ternary complex formation with glutamate dehydrogenase.

H Koekoek, G T Robillard

    European Journal of Biochemistry
    |September 15, 1977
    PubMed
    Summary

    Glutamate dehydrogenase shows little substrate discrimination in binary complexes. However, coenzyme binding is highly selective, strongly favoring the correct substrate for ternary complex formation.

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    Biochemistry·2000

    Area of Science:

    • Biochemistry
    • Enzyme kinetics
    • Structural biology

    Background:

    • Glutamate dehydrogenase (GDH) is a key metabolic enzyme.
    • Understanding substrate specificity is crucial for enzyme function.
    • Binary and ternary complex formation influences enzyme activity.

    Purpose of the Study:

    • To investigate substrate discrimination by glutamate dehydrogenase.
    • To analyze the role of coenzyme in substrate recognition.
    • To characterize the binding affinities in binary and ternary complexes.

    Main Methods:

    • Proton nuclear magnetic resonance (NMR) spectroscopy was employed.
    • Binding affinities (KD) were determined for dicarboxylic acid analogues.
    • Coenzyme titration was used to form ternary complexes.

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    Main Results:

    • Minimal variation in KD (factor of five) was observed for dicarboxylic acid analogues in binary complexes.
    • Coenzyme binding to the binary complex showed significant discrimination.
    • Coenzyme bound 10-150 times more weakly to incorrect substrates compared to the correct one.

    Conclusions:

    • Glutamate dehydrogenase exhibits low specificity for dicarboxylic acid substrates in binary interactions.
    • Coenzyme binding is the critical step for achieving high substrate discrimination in GDH.
    • The enzyme utilizes coenzyme recognition to ensure the selection of the correct substrate for catalysis.