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Kinetic steps for alpha-helix formation

R A Bertsch1, N Vaidehi, S I Chan

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena 91125, USA.

Proteins
|November 26, 1998
PubMed
Summary
This summary is machine-generated.

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Polyalanine readily forms alpha-helices through local hydrogen bonds, unlike polyglycine which gets trapped in irregular structures. This study reveals helix formation kinetics and a model for their rearrangement.

Area of Science:

  • Computational chemistry
  • Biophysics
  • Protein folding

Background:

  • Understanding protein secondary structure formation, like alpha-helices, is crucial for molecular biology.
  • Polymers like polyalanine and polyglycine serve as model systems to study folding mechanisms.

Purpose of the Study:

  • To investigate the kinetics of alpha-helix formation in polyalanine and polyglycine using molecular dynamics.
  • To differentiate the roles of local versus nonlocal hydrogen bonds in polymer folding.

Main Methods:

  • Torsional-coordinate molecular dynamics (MD) simulations were performed on polyalanine and polyglycine eicosamers (20-mers).
  • Analysis focused on the formation and persistence of alpha-helices and hydrogen bond patterns.

Main Results:

Related Experiment Videos

  • Polyalanine (Ala)20 demonstrated a high propensity (83%) for forming persistent alpha-helices.
  • Polyglycine (Gly)20 showed significantly lower alpha-helix formation (10%), with shorter and less stable helices.
  • Helix formation involves a competition between rapid local hydrogen bond formation and slower nonlocal hydrogen bond rearrangement.

Conclusions:

  • Local hydrogen bonds are key drivers for rapid alpha-helix formation in polyalanine.
  • Nonlocal hydrogen bonds can impede helix formation by trapping polymers in non-native structures.
  • The study proposes a kinetic model for helix formation and suggests torsional-coordinate MD accelerates folding simulations.