arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0807.2698q-bio.BM
收藏

生物蛋白质材料力学表征的介观模型

Mesoscopic model for mechanical characterization of biological protein materials

Gwonchan Yoon, Hyung-Jin Park, Sungsoo Na, Kilho Eom

摘要:

蛋白质分子的力学特性研究对于深入了解蛋白质的生物学功能具有重要意义。在这里,我们提出了介观模型的生物蛋白质材料组成的蛋白质晶体规定的Go势的弹性行为的蛋白质材料的表征。具体而言,我们认为,代表性的体积元(RVE)包含的蛋白质晶体所代表的α-碳原子,规定的Go电位,与应用程序的恒定法向应变RVE。从维里应力理论计算的应力-应变关系提供了蛋白质材料的非线性弹性行为和它们的机械性质,例如杨氏模量,定量和/或定性地与从实验和/或原子模拟获得的生物蛋白质材料的机械性质相当。此外,我们还讨论了天然拓扑结构对蛋白质晶体力学性质的影响。结果表明,平行链(氢键平行)增强了蛋白质材料的机械弹性。

英文摘要:

Mechanical characterization of protein molecules has played a role on gaining insight into the biological functions of proteins, since some proteins perform the mechanical function. Here, we present the mesoscopic model of biological protein materials composed of protein crystals prescribed by Go potential for characterization of elastic behavior of protein materials. Specifically, we consider the representative volume element (RVE) containing the protein crystals represented by alpha-carbon atoms, prescribed by Go potential, with application of constant normal strain to RVE. The stress-strain relationship computed from virial stress theory provides the nonlinear elastic behavior of protein materials and their mechanical properties such as Young's modulus, quantitatively and/or qualitatively comparable to mechanical properties of biological protein materials obtained from experiments and/or atomistic simulations. Further, we discuss the role of native topology on the mechanical properties of protein crystals. It is shown that parallel strands (hydrogen bonds in parallel) enhances the mechanical resilience of protein materials.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑