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Related Experiment Videos

Dynamics of local conformation and enzyme function.

B L Vallee, J F Riordan

    Ciba Foundation Symposium
    |January 1, 1977
    PubMed
    Summary
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    Enzyme activity depends on localized conformational changes during catalysis. Researchers used spectroscopy and kinetic methods to observe these dynamic events, revealing discrete conformational states crucial for enzyme mechanisms.

    Area of Science:

    • Biochemistry
    • Enzymology
    • Structural Biology

    Background:

    • Enzyme function is sensitive to structural changes, but localized dynamics during catalysis are poorly understood.
    • Understanding these dynamics is key to verifying enzyme mechanisms.
    • Time-averaged structures may not reflect the motile nature of enzyme active sites.

    Purpose of the Study:

    • To investigate the syncatalytic, spatial relationships of active-site residues.
    • To understand how localized conformational changes affect enzyme activity and mechanism.
    • To develop a minimal model for the dynamic aspects of enzyme action.

    Main Methods:

    • Absorption spectroscopy
    • Circular dichroism (CD) and magnetocircular dichroism (MCD)

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  • Resonance Raman spectroscopy and resonance energy transfer
  • Stopped-flow, pH, and temperature jump methods

    • Main Results:

    • Observed syncatalytic spatial relationships of active-site residues.
    • Quantitatively assessed conformational and local structural features.
    • Identified multiple, discrete conformational states with mechanistic significance.

    Conclusions:

    • Localized conformational changes are critical for enzyme catalysis.
    • Dynamic events during catalysis can be directly observed.
    • These findings provide a basis for a dynamic model of enzyme action.