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2015 ; 11
(7
): 1850-6
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High-resolution structural characterization of Noxa, an intrinsically disordered
protein, by microsecond molecular dynamics simulations
#MMPMID25855872
Espinoza-Fonseca LM
; Kelekar A
Mol Biosyst
2015[Jul]; 11
(7
): 1850-6
PMID25855872
show ga
High-resolution characterization of the structure and dynamics of intrinsically
disordered proteins (IDPs) remains a challenging task. Consequently, a detailed
understanding of the structural and functional features of IDPs remains limited,
as very few full-length disordered proteins have been structurally characterized.
We have performed microsecond-long molecular dynamics (MD) simulations of Noxa,
the smallest member of the large Bcl-2 family of apoptosis regulating proteins,
to characterize in atomic-level detail the structural features of a disordered
protein. A 2.5 ?s MD simulation starting from an unfolded state of the protein
revealed the formation of a central antiparallel ?-sheet structure flanked by two
disordered segments at the N- and C-terminal ends. This topology is in reasonable
agreement with protein disorder predictions and available experimental data. We
show that this fold plays an essential role in the intracellular function and
regulation of Noxa. We demonstrate that unbiased MD simulations in combination
with a modern force field reveal structural and functional features of disordered
proteins at atomic-level resolution.