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Related Experiment Videos

Low pH dimerization of chymotrypsin in solution.

M J Gorbunoff, G Fosmire, S N Timasheff

    Biochemistry
    |September 19, 1978
    PubMed
    Summary
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    Alpha-chymotrypsin dimerization in solution is driven by electrostatic interactions involving His-57 and Tyr-146. Chemical modifications confirmed this mechanism, highlighting differences between solution and crystal states.

    Area of Science:

    • Biochemistry
    • Protein Chemistry
    • Enzymology

    Background:

    • Alpha-chymotrypsin is a serine protease crucial for protein digestion.
    • Understanding its dimerization mechanism in solution is key to enzyme function.
    • Previous models proposed electrostatic interactions for dimerization.

    Purpose of the Study:

    • To reexamine the acid-induced dimerization mechanism of alpha-chymotrypsin in solution.
    • To investigate the roles of specific amino acid residues in the dimerization process.
    • To compare solution dimerization with crystal structures.

    Main Methods:

    • Utilizing various chemical derivatives of alpha-chymotrypsin.
    • Modifying key residues like Tyr-146 and His-57.
    • Analyzing changes in dimerization constants through chemical treatments.

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    Main Results:

    • Blocking Tyr-146 carboxyl or methylating His-57 abolished dimerization.
    • O-Acetylation of Tyr-146 decreased the dimerization constant.
    • Deacetylation of other tyrosines had no effect on dimerization.

    Conclusions:

    • The electrostatic interaction between His-57 imidazolium and Tyr-146 carboxyl is central to dimerization.
    • The proposed mechanism by Aune and Timasheff remains consistent with experimental data.
    • Solution dimerization differs from crystal interactions, lacking sulfate ion bridges.