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Helices and Sheets in vacuo.

Martin F Jarrold1

  • 1Chemistry Department, Indiana University 800 East Kirkwood Avenue, Bloomington 47405, Indiana, USA. mfj@indiana.edu

Physical Chemistry Chemical Physics : PCCP
|March 31, 2007
PubMed
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Unsolvated peptides exhibit unique structures and properties, with charge significantly influencing helix and sheet stability. Their behavior in vacuum differs from aqueous solutions, revealing new insights into peptide folding.

Area of Science:

  • Biochemistry
  • Computational Chemistry
  • Structural Biology

Background:

  • Peptides can form secondary structures like helices and sheets.
  • Understanding unsolvated peptide behavior is crucial for various applications.
  • Previous studies focused on peptides in solution, limiting insights into intrinsic properties.

Purpose of the Study:

  • To investigate the structures and properties of unsolvated peptides.
  • To identify factors stabilizing secondary structures in vacuum.
  • To explore the role of charge and hydration on peptide conformation.

Main Methods:

  • Experimental investigations of peptide structures.
  • Computational simulations of peptide behavior.
  • Stepwise hydration studies to analyze water molecule interactions.

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Main Results:

  • Charge critically stabilizes alpha-helices and destabilizes beta-sheets in vacuum.
  • Some helical peptides are more stable in vacuum than in water.
  • Water molecules bind preferentially to clefts, not protonation sites, forming hydrogen bond networks.
  • Non-covalent interactions drive tertiary structure formation and complex assembly.

Conclusions:

  • Peptide stability and folding are significantly influenced by the absence of solvent.
  • Charge is a key determinant of secondary structure stability in unsolvated peptides.
  • Hydration dynamics reveal specific binding preferences and their role in stabilizing peptide structures.