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2017 ; 6
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English Wikipedia
The liquid structure of elastin
#MMPMID29120326
Rauscher S
; Pomès R
Elife
2017[Nov]; 6
(ä): ä PMID29120326
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The protein elastin imparts extensibility, elastic recoil, and resilience to
tissues including arterial walls, skin, lung alveoli, and the uterus. Elastin and
elastin-like peptides are hydrophobic, disordered, and undergo liquid-liquid
phase separation upon self-assembly. Despite extensive study, the structure of
elastin remains controversial. We use molecular dynamics simulations on a massive
scale to elucidate the structural ensemble of aggregated elastin-like peptides.
Consistent with the entropic nature of elastic recoil, the aggregated state is
stabilized by the hydrophobic effect. However, self-assembly does not entail
formation of a hydrophobic core. The polypeptide backbone forms transient, sparse
hydrogen-bonded turns and remains significantly hydrated even as self-assembly
triples the extent of non-polar side chain contacts. Individual chains in the
assembly approach a maximally-disordered, melt-like state which may be called the
liquid state of proteins. These findings resolve long-standing controversies
regarding elastin structure and function and afford insight into the phase
separation of disordered proteins.