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Allosteric disulfide bonds.

Bryan Schmidt1, Lorraine Ho, Philip J Hogg

  • 1Centre for Vascular Research, University of New South Wales and Department of Haematology, Prince of Wales Hospital, Sydney, New South Wales 2052, Australia.

Biochemistry
|June 14, 2006
PubMed
Summary

Researchers identified a third type of disulfide bond, termed allosteric disulfides, which control protein function. The -RHStaple configuration is a key hallmark of these functional disulfide bonds.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Protein Science

Background:

  • Disulfide bonds traditionally serve structural or catalytic roles in proteins.
  • Emerging evidence suggests a third category of disulfide bonds influencing protein function.
  • These are termed allosteric disulfides, mediating conformational changes upon formation or breakage.

Purpose of the Study:

  • To define the properties of allosteric disulfide bonds.
  • To analyze the geometry and dihedral strain of a large dataset of disulfide bonds.
  • To identify characteristic features of allosteric disulfide bonds.

Main Methods:

  • Analysis of 6,874 unique disulfide bonds from 2,776 X-ray protein structures.
  • Classification of disulfide bonds into 20 types based on five chi angles.
  • Evaluation of geometric and dihedral strain properties.

Main Results:

  • Identified 20 distinct disulfide bond types based on geometric parameters.
  • Known allosteric disulfides were exclusively found within the '-RHStaple' bond group.
  • The -RHStaple group exhibits high mean potential energy and narrow energy distribution, suggesting functional significance.
  • Approximately 1 in 15 structurally determined disulfide bonds may be allosteric.

Conclusions:

  • The -RHStaple disulfide bond configuration is proposed as a hallmark of allosteric disulfides.
  • Allosteric disulfide bonds represent a significant functional class beyond structural and catalytic roles.
  • This finding provides a new perspective on protein regulation and function.

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