Unfolding of an α-helix in water

K. V. Soman, A. Karimi, D. A. Case

Research output: Contribution to journalArticle

131 Citations (Scopus)

Abstract

We describe a 1 ns molecular dynamics simulation of an 18-residue peptide (corresponding to a portion of the H helix of myoglobin) in water. The initial helical conformation progressively frays to a more disordered structure, with the loss of internal secondary structure generally proceeding from the C-terminus toward the N-terminus. Although a variety of mechanisms are involved in the breaking of helical hydrogen bonds, the formation of transient turn structures, with i → i + 3 hydrogen bonds, and bifurcated hydrogen-bond structures intermediate between α and turn or 310 structures is a common motif. In some cases a single water molecule is inserted into an internal hydrogen bond, but it is also common to have several water molecules involved in transient intermediates. Overall, the results provide new information about the detailed mechanisms by which helices are made and broken in aqueous solution.

Original languageEnglish (US)
Pages (from-to)1351-1361
Number of pages11
JournalBiopolymers
Volume31
Issue number12
StatePublished - Jan 1 1991
Externally publishedYes

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Hydrogen
Hydrogen bonds
Water
Molecules
Myoglobin
Molecular Dynamics Simulation
Peptides
Conformations
Molecular dynamics
Computer simulation

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry
  • Biophysics

Cite this

Soman, K. V., Karimi, A., & Case, D. A. (1991). Unfolding of an α-helix in water. Biopolymers, 31(12), 1351-1361.

Unfolding of an α-helix in water. / Soman, K. V.; Karimi, A.; Case, D. A.

In: Biopolymers, Vol. 31, No. 12, 01.01.1991, p. 1351-1361.

Research output: Contribution to journalArticle

Soman, KV, Karimi, A & Case, DA 1991, 'Unfolding of an α-helix in water', Biopolymers, vol. 31, no. 12, pp. 1351-1361.
Soman KV, Karimi A, Case DA. Unfolding of an α-helix in water. Biopolymers. 1991 Jan 1;31(12):1351-1361.
Soman, K. V. ; Karimi, A. ; Case, D. A. / Unfolding of an α-helix in water. In: Biopolymers. 1991 ; Vol. 31, No. 12. pp. 1351-1361.
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