Protein unfolding accounts for the unusual mechanical behavior of fibrin networks.

Protein unfolding accounts for the unusual mechanical behavior of fibrin networks.
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DOI:
10.1016/j.actbio.2011.02.026
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发表时间:
2011-06
期刊:
影响因子:
9.7
通讯作者:
Weisel, John W.
Weisel, John W.
中科院分区:
工程技术1区
文献类型:
--
作者:
Purohit, Prashant K.;Litvinov, Rustem I.;Brown, Andre E. X.;Discher, Dennis E.;Weisel, John W.

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We describe the mechanical behavior of isotropic fibrin networks at the macroscopic scale in terms of the nanoscale force response of fibrin molecules that are its basic building blocks. We show that the remarkable extensibility and compressibility of fibrin networks have their origins in the unfolding of fibrin molecules. The force-stretch behavior of a single fibrin fiber is described using a two-state model in which the fiber has a linear force-stretch relation in the folded phase and behaves like a worm-like-chain in the unfolded phase. The nanoscale force-stretch response is connected to the macro-scale stress-stretch response by means of the eight-chain model. This model is able to capture the macroscopic response of a fibrin network in uniaxial tension and appears remarkably simple given the molecular complexity. We use the eight-chain model to explain why fibrin networks have negative compressibility and Poisson’s ratio greater than one due to unfolding of fibrin molecules.
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