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Related Experiment Videos

An allosteric model for ribonuclease.

E J Walker, G B Ralston, I G Darvey

    The Biochemical Journal
    |June 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Bovine pancreatic ribonuclease (RNAase) kinetics deviate from standard models, suggesting an allosteric mechanism. This model explains enzyme activity changes and protection by substrate analogues.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Molecular Biology

    Background:

    • Ribonuclease (RNAase) is crucial for RNA processing.
    • Conventional enzyme kinetics models do not fully explain RNAase activity.
    • Ligand-induced conformational changes in enzymes are increasingly recognized.

    Purpose of the Study:

    • To investigate the non-conventional kinetics of cytidine 2':3'-cyclic monophosphate hydrolysis by bovine pancreatic RNAase.
    • To propose and validate a new kinetic model for RNAase activity.
    • To explore the role of substrate analogues in RNAase conformation and activity.

    Main Methods:

    • Kinetic analysis of cytidine 2':3'-cyclic monophosphate hydrolysis using two assay systems.
    • Development and testing of an allosteric enzyme model.

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  • Examination of RNAase protection against tryptic digestion using substrate analogues.

    • Main Results:

    • RNAase hydrolysis kinetics are inconsistent with conventional models.
    • An allosteric model, involving substrate-dependent conformational changes, accurately fits experimental data.
    • Substrate analogues protect RNAase from trypsin digestion in a concentration-dependent manner, consistent with the proposed model.

    Conclusions:

    • Bovine pancreatic RNAase exhibits allosteric kinetics, not explained by simple Michaelis-Menten models.
    • The proposed allosteric model accounts for observed kinetic data, substrate analogue interactions, and literature findings on conformational changes.
    • This study provides a refined understanding of RNAase mechanism and enzyme-ligand interactions.