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2015 ; 5
(ä): 18128
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Intrinsic Localized Modes in Proteins
#MMPMID26658321
Nicolaï A
; Delarue P
; Senet P
Sci Rep
2015[Dec]; 5
(ä): 18128
PMID26658321
show ga
Protein dynamics is essential for proteins to function. Here we predicted the
existence of rare, large nonlinear excitations, termed intrinsic localized modes
(ILMs), of the main chain of proteins based on all-atom molecular dynamics
simulations of two fast-folder proteins and of a rigid ?/? protein at 300?K and
at 380?K in solution. These nonlinear excitations arise from the anharmonicity of
the protein dynamics. The ILMs were detected by computing the Shannon entropy of
the protein main-chain fluctuations. In the non-native state (significantly
explored at 380?K), the probability of their excitation was increased by a factor
between 9 and 28 for the fast-folder proteins and by a factor 2 for the rigid
protein. This enhancement in the non-native state was due to glycine, as
demonstrated by simulations in which glycine was mutated to alanine. These ILMs
might play a functional role in the flexible regions of proteins and in proteins
in a non-native state (i.e. misfolded or unfolded states).