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Electrostatic effects in proteins

M F Perutz

    Science (New York, N.Y.)
    |September 29, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Electrostatic interactions are crucial for protein folding, function, and stability. These effects, including salt bridges and dipoles, influence protein assembly, enzyme activity, and oxygen binding in hemoglobin.

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    Area of Science:

    • Biochemistry
    • Structural Biology
    • Protein Dynamics

    Background:

    • Electrostatic interactions play a fundamental role in protein behavior, influencing folding, stability, and function.
    • Polar side chains typically move to the protein exterior for solvation, but internal water molecules are observed in some protein structures.
    • Specific examples include chymotrypsin family enzymes, hemoglobin, and tobacco mosaic virus protein.

    Purpose of the Study:

    • To highlight the pervasive influence of electrostatic effects on diverse protein systems.
    • To examine the role of electrostatic interactions in protein folding, assembly, and stabilization.
    • To explore how electrostatic factors modulate protein function, such as oxygen affinity and enzyme catalysis.

    Main Methods:

    • Analysis of existing literature and structural data on various proteins.

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  • Examination of electrostatic contributions to protein folding and quaternary structure stabilization.
  • Investigation of factors affecting protein stability, including salt bridges and internal water.

    • Main Results:

    • Electrostatic interactions govern protein folding, with polar groups often on the exterior.
    • Internal water molecules are found in specific protein structures, mediating interactions.
    • Electrostatic forces are key in the assembly of tobacco mosaic virus protein and stabilize hemoglobin's deoxy structure.
    • Lysozyme utilizes dipoles to stabilize transition states, while thermophilic enzymes gain stability from salt bridges.

    Conclusions:

    • Electrostatic effects are a dominant force in protein behavior, from folding to function.
    • Salt bridges and charge distributions are critical for protein stability and conformational states.
    • Understanding electrostatic interactions is essential for comprehending protein mechanisms and engineering novel proteins.