TY - JOUR
T1 - Computational study of the stability of the miniprotein trp-cage, the GB1 β-hairpin, and the AK16 peptide, under negative pressure
AU - Hatch, Harold W.
AU - Stillinger, Frank H.
AU - Debenedetti, Pablo G.
N1 - Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2014/7/17
Y1 - 2014/7/17
N2 - Although hot, cold, and high pressure denaturation are well characterized, the possibility of negative pressure unfolding has received much less attention. Proteins under negative pressure, however, are important in applications such as medical ultrasound, and the survival of biopoloymers in the xylem and adjacent parenchyma cells of vascular plants. In addition, negative pressure unfolding is fundamentally important in obtaining a complete understanding of protein stability and naturally complements previous studies of high pressure denaturation. We use extensive replica-exchange molecular dynamics (REMD) simulations and thermodynamic analysis to obtain folding/unfolding equilibrium phase diagrams for the miniprotein trp-cage (α-structure, 20-residue), the GB1 β-hairpin (β-structure, 16-residue), and the AK16 peptide (α-helix, 16-residue). Although the trp-cage is destabilized by negative pressure, the GB1 β-hairpin and AK16 peptide are stabilized by this condition.
AB - Although hot, cold, and high pressure denaturation are well characterized, the possibility of negative pressure unfolding has received much less attention. Proteins under negative pressure, however, are important in applications such as medical ultrasound, and the survival of biopoloymers in the xylem and adjacent parenchyma cells of vascular plants. In addition, negative pressure unfolding is fundamentally important in obtaining a complete understanding of protein stability and naturally complements previous studies of high pressure denaturation. We use extensive replica-exchange molecular dynamics (REMD) simulations and thermodynamic analysis to obtain folding/unfolding equilibrium phase diagrams for the miniprotein trp-cage (α-structure, 20-residue), the GB1 β-hairpin (β-structure, 16-residue), and the AK16 peptide (α-helix, 16-residue). Although the trp-cage is destabilized by negative pressure, the GB1 β-hairpin and AK16 peptide are stabilized by this condition.
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U2 - 10.1021/jp410651u
DO - 10.1021/jp410651u
M3 - Article
C2 - 24559466
AN - SCOPUS:84904559052
SN - 1520-6106
VL - 118
SP - 7761
EP - 7769
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
IS - 28
ER -