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Rapid motions in protein molecules

L Stryer

    Biochemical Society Symposium
    |January 1, 1981
    PubMed
    Summary

    Proteins exhibit rapid segmental flexibility and internal residue motions on nanosecond and sub-nanosecond timescales. These dynamics, observed via optical techniques, reveal nature

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    Area of Science:

    • Biophysics
    • Protein Dynamics
    • Spectroscopy

    Background:

    • Protein molecules exhibit complex motions crucial for their function.
    • Optical techniques utilizing short light pulses enable the study of rapid molecular dynamics.
    • Understanding protein flexibility is key to deciphering biological processes.

    Purpose of the Study:

    • To investigate rapid motions and conformational changes in protein molecules.
    • To explore the characteristic timescales of protein domain rotation and internal residue flexibility.
    • To apply advanced spectroscopic methods for observing ultrafast molecular events.

    Main Methods:

    • Nanosecond fluorescence polarization studies to measure protein domain rotation.
    • Time-resolved fluorescence polarization to assess internal tryptophan residue flexibility.
    • Resonance Raman spectroscopy with picosecond laser pulses to study photolabile molecule conformational transitions.

    Main Results:

    • Segmental flexibility, involving domain rotation on nanosecond timescales, was observed in proteins like immunoglobulin G and myosin.
    • Internal tryptophan residues in proteins such as azurin demonstrated flexibility within the sub-nanosecond range.
    • Resonance Raman spectroscopy revealed that the cis-trans isomerization of retinal in rhodopsin occurs within picoseconds after photon absorption.

    Conclusions:

    • Proteins possess inherent segmental flexibility and internal motions occurring on very rapid timescales.
    • Optical techniques, particularly time-resolved fluorescence polarization and resonance Raman spectroscopy, are powerful tools for studying these ultrafast protein dynamics.
    • Nature has evolved proteins with designed rapid motions in specific regions, suggesting functional significance.

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