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Disulfide bonding patterns and protein topologies

C J Benham1, M S Jafri

  • 1Department of Biomathematical Sciences, Mount Sinai School of Medicine, New York, New York 10029.

Protein Science : a Publication of the Protein Society
|January 1, 1993
PubMed
Summary
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Protein disulfide bonding patterns are not random. Analysis reveals directed formation and avoidance of complex topological entanglements, suggesting specific biological processes govern these crucial protein structures.

Area of Science:

  • Structural biology
  • Biophysics
  • Computational biology

Background:

  • Protein disulfide bonds are critical for stability and function.
  • Understanding disulfide bonding patterns is key to protein folding and evolution.

Purpose of the Study:

  • To analyze the topological properties of protein disulfide bonding patterns.
  • To determine if disulfide bond formation is a random or directed process.
  • To investigate the topological characteristics of disulfide bonds in known protein structures.

Main Methods:

  • Developing a graph-based description for disulfide bonding patterns.
  • Enumerating and analyzing pattern properties (symmetry, reducibility).
  • Statistical analysis of disulfide patterns in protein databases (PDB, NBRF).

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Main Results:

  • Observed disulfide patterns are more symmetric/reducible than predicted by random models.
  • Disulfide bond formation is largely uncorrelated with proximity of cysteine residues.
  • Protein structures avoid topological entanglements like linking and knotting, but show pseudolinking.

Conclusions:

  • Disulfide bond pattern formation appears to be a directed, non-random process.
  • Topological constraints likely influence disulfide bond formation and arrangement.
  • The observed avoidance of complex topological entanglements suggests evolutionary selection or physical constraints.