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arXiv 1208.2636q-bio.BMcond-mat.softphysics.bio-ph
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内在无序蛋白构象波动动力学的分子模拟

Molecular Simulations of the Fluctuating Conformational Dynamics of Intrinsically Disordered Proteins

W. Wendell Smith, Carl F. Schreck, Nabeem Hashem, Sherwin Soltani, Abhinav Nath, Elizabeth Rhoades, Corey S. O'Hern

摘要:

内在无序蛋白(IDP)在生理条件下在溶液中不具有明确的三维结构。我们开发的IDP α-突触核蛋白,包括几何,有吸引力的疏水,和筛选的静电相互作用,并校准到最近的smFRET实验中测得的残基间分离的全原子,联合原子,和粗粒度的朗之万动力学模拟。我们发现,α-突触核蛋白是无序的构象统计之间的随机游走和崩溃的小球行为的中间。校准的分子模拟约束方法的一个优点是,物理力作用于所有的残基,而不仅仅是在实验监测的残基对,这些模拟可以用来研究寡聚化和聚集的多个α-突触核蛋白的蛋白质,可能先于淀粉样蛋白的形成。

英文摘要:

Intrinsically disordered proteins (IDPs) do not possess well-defined three-dimensional structures in solution under physiological conditions. We develop all-atom, united-atom, and coarse-grained Langevin dynamics simulations for the IDP alpha-synuclein that include geometric, attractive hydrophobic, and screened electrostatic interactions and are calibrated to the inter-residue separations measured in recent smFRET experiments. We find that alpha-synuclein is disordered with conformational statistics that are intermediate between random walk and collapsed globule behavior. An advantage of calibrated molecular simulations over constraint methods is that physical forces act on all residues, not only on residue pairs that are monitored experimentally, and these simulations can be used to study oligomerization and aggregation of multiple alpha-synuclein proteins that may precede amyloid formation.

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