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首页> 外文期刊>International journal of multiscale computational engineering >Atomistically Informed Mesoscale Model of Alpha-Helical Protein Domains
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Atomistically Informed Mesoscale Model of Alpha-Helical Protein Domains

机译:α螺旋蛋白域的原子通知中尺度模型。

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Multiscale mechanical properties of biological protein materials have been the focal point of extensive investigations over the past decades. In this article, we present the development of a mesoscale model of alpha-helical (AH) protein domains, key constituents in a variety of biological materials, including cells, hair, hooves, and wool. Our model, derived solely from results of full atomistic simulations, is suitable to describe the deformation and fracture mechanics over multiple orders of magnitude in time- and length scales. After validation of the mesoscale model against atomistic simulation results, we present two case studies, in which we investigate, first, the effect of the length of an AH protein domain on its strength properties, and second, the effect of the length of two parallel AH protein domain arrangement on its shear strength properties and deformation mechanisms. We find that longer AHs feature a reduced tensile strength, whereas the tensile strength is maximized for ultrashort protein structures. Moreover, we find that the shearing of two parallel AHs engenders sliding, rather than AH unfolding, and that the shear strength does not significantly depend on the length of the two AHs.
机译:在过去的几十年中,生物蛋白质材料的多尺度机械性能一直是广泛研究的重点。在本文中,我们介绍了α-螺旋(AH)蛋白域的中尺度模型的发展,α-螺旋(AH)蛋白域是包括细胞,头发,蹄和羊毛在内的多种生物材料的关键成分。我们的模型仅来自完整的原子模拟结果,适合于描述时间和长度尺度上多个数量级的变形和断裂力学。在针对原子模拟结果验证了中尺度模型之后,我们提出了两个案例研究,其中我们调查了第一,AH蛋白域长度对其强度特性的影响,其次,两个平行蛋白质长度的影响。 AH蛋白的结构域排列对其抗剪强度特性和变形机理的影响。我们发现较长的AH具有降低的拉伸强度,而超短蛋白质结构的拉伸强度最大。此外,我们发现两个平行AH的剪切会导致滑动,而不是AH展开,并且剪切强度并不明显取决于两个AH的长度。

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