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Related Experiment Videos

Hydrogen exchange in RNase A: neutron diffraction study

A Wlodawer, L Sjölin

    Proceedings of the National Academy of Sciences of the United States of America
    |March 1, 1982
    PubMed
    Summary

    Neutron crystallography revealed protected amide hydrogens in ribonuclease A (RNase A) crystals. These protected sites indicate regions of low flexibility and solvent inaccessibility within the enzyme structure.

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    Area of Science:

    • Biochemistry
    • Structural Biology
    • Enzymology

    Background:

    • Ribonuclease A (RNase A) is a key enzyme in RNA processing.
    • Understanding protein dynamics and solvent accessibility is crucial for enzyme function.
    • Hydrogen exchange (HX) methods probe protein flexibility and hydrogen bonding.

    Purpose of the Study:

    • To investigate hydrogen exchange in a single crystal of RNase A using neutron diffraction.
    • To identify protected amide hydrogens and map regions of low flexibility.
    • To correlate structural findings with known models of RNase A dynamics.

    Main Methods:

    • Single crystal neutron structure investigation of RNase A.
    • Refinement of amide hydrogen occupancies to determine isotope presence and measurement errors.
    • Analysis of hydrogen bonding and solvent accessibility.

    Main Results:

    • Twenty-eight out of 120 peptide amide hydrogens were protected from exchange.
    • Protected hydrogens were primarily involved in main-chain hydrogen bonds.
    • A beta-sheet region (residues 75, 106-109, 116, 118) showed significant protection, indicating low flexibility.
    • Protected amide hydrogens were also observed in an alpha-helix (residues 11-13).

    Conclusions:

    • The study identified specific regions of low flexibility and solvent inaccessibility in RNase A crystals.
    • Findings support models of cooperative unwinding in the N-terminal alpha-helix.
    • Neutron crystallography provides valuable insights into protein dynamics and hydrogen bonding networks.

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