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A square pyramidal model for ribonuclease action

R R Holmes

    International Journal of Peptide and Protein Research
    |January 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    A new square pyramidal (SP) model for bovine pancreatic ribonuclease action is proposed. This model, compared to the trigonal bipyramidal (TP) model, suggests a preferred intermediate geometry for enzymatic hydrolysis.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Structural Biology

    Background:

    • Bovine pancreatic ribonuclease is a key enzyme in RNA hydrolysis.
    • Previous models for its mechanism include the trigonal bipyramidal (TP) representation.
    • Understanding the active site geometry and enzyme constraints is crucial for elucidating the catalytic mechanism.

    Purpose of the Study:

    • To present a novel square pyramidal (SP) model for the action of bovine pancreatic ribonuclease.
    • To compare the SP model with the existing TP model regarding active site geometry and enzyme constraints.
    • To evaluate the energetic feasibility and geometric preferences of the proposed SP mechanism.

    Main Methods:

    • Formulation of a square pyramidal (SP) model based on pentacoordinate structural principles.

    Related Experiment Videos

  • Comparison of the SP model with the trigonal bipyramidal (TP) model.
  • Analysis of two SP variants: adjacent (cis displacement) and in-line (trans displacement) processes.
  • Energetic evaluation of the SP and TP models.

    • Main Results:

    • The in-line (trans displacement) SP mechanism aligns with existing model studies, similar to the TP model.
    • The energetic difference between the SP and TP models is estimated at 1-2 kcal/mol.
    • Pseudorotation is deemed an unlikely process for either the SP or TP models.

    Conclusions:

    • The square pyramidal (SP) model offers a viable alternative for understanding bovine pancreatic ribonuclease action.
    • The preferred mechanism likely involves a geometry intermediate between the idealized SP and TP models.
    • The findings refine our understanding of enzymatic hydrolysis mechanisms and enzyme active site dynamics.