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Conformational interconversion in compstatin probed with molecular dynamics simulations.

Buddhadeb Mallik1, John D Lambris, Dimitrios Morikis

  • 1Department of Chemical and Environmental Engineering, University of California at Riverside, Riverside, California 92521, USA.

Proteins
|August 29, 2003
PubMed
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Compstatin, a peptide therapeutic for complement activation, undergoes conformational changes. Molecular dynamics simulations reveal multiple stable conformations, aiding drug design through structure-activity relationships.

Area of Science:

  • Biochemistry
  • Computational Biology
  • Pharmacology

Background:

  • Compstatin is a cyclic peptide with therapeutic potential against unregulated complement activation.
  • Understanding compstatin's structural dynamics is crucial for optimizing its activity.

Purpose of the Study:

  • To investigate the structural and dynamic characteristics of compstatin using molecular dynamics (MD) simulations.
  • To identify stable conformations and understand conformational interconversion for rational drug design.

Main Methods:

  • Performed 1-ns molecular dynamics (MD) simulations using NMR structures, average minimized structure, and global optimization structure as input.
  • Analyzed the ensemble of structures to identify distinct conformations and their populations.

Related Experiment Videos

Main Results:

  • Identified five major compstatin conformations: coil with beta-turn, beta-hairpin variants, and alpha-helical.
  • Observed conformational switching with small backbone motions and low free energy barriers.
  • NMR ensemble structures predominantly retained beta-turns, while minimized/optimized structures shifted to alpha-helical.

Conclusions:

  • MD simulations provide insight into compstatin's conformational landscape and interconversion.
  • The identified conformers serve as templates for optimizing compstatin design using structure-activity (SAR) and dynamics-activity (DAR) relations.