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Molecular dynamics simulations of the unfolding of an .alpha.-helical analog of ribonuclease A S-peptide in water

Tirado-Rives, Julian, Jorgensen, William L.·1991·Biochemistry

Abstract

Molecular dynamics simulations of the S-peptide analogue AETAAAKFLREHMDS have been conducted in aqueous solution for 300 ps at 278 K and for 500 ps in two different runs at 358 K. The results show agreement with experimental observations in that at low temperature, 5 degrees C, the helix is stable, while unfolding is observed at 85 degrees C. In the low-temperature simulation a solvent-separated ion pair was formed between Glu-2 and Arg-10, and the side chain of His-12 reoriented toward the C-terminal end of the alpha-helix. Detailed analyses of the unfolding pathways at high temperature have also revealed that the formation or disappearance of main-chain helical hydrogen bonds occurs frequently through an alpha in equilibrium with 3(10) in equilibrium with no hydrogen bond sequence.

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Metadata

Authors
Tirado-Rives, J., & Jorgensen, W. L.
Venue
Biochemistry
Published
1991-04-23
Volume
30
Issue
16
Pages
3864-3871
ISSN
  • 0006-2960 (ISSN-L)
  • 1520-4995
OpenAlex
W2077042715
Cited by
214
References
0
FWCI
6.22
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Molecular dynamics simulations of the unfolding of an .alpha.-helical analog of ribonuclease A S-peptide in water. https://app.cochat.ai/papers/10.1021/bi00230a009
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Tirado-Rives, J., & Jorgensen, W. L. (1991). Molecular dynamics simulations of the unfolding of an .alpha.-helical analog of ribonuclease A S-peptide in water. Biochemistry. https://doi.org/10.1021/bi00230a009

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