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Origin of icosahedral symmetry in viruses.

机译:病毒中二十面体对称性的起源。

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摘要

With few exceptions, the shells (capsids) of sphere-like viruses have the symmetry of an icosahedron and are composed of coat proteins (subunits) assembled in special motifs, the T-number structures. Although the synthesis of artificial protein cages is a rapidly developing area of materials science, the design criteria for self-assembled shells that can reproduce the remarkable properties of viral capsids are only beginning to be understood. We present here a minimal model for equilibrium capsid structure, introducing an explicit interaction between protein multimers (capsomers). Using Monte Carlo simulation we show that the model reproduces the main structures of viruses in vivo (T-number icosahedra) and important nonicosahedral structures (with octahedral and cubic symmetry) observed in vitro. Our model can also predict capsid strength and shed light on genome release mechanisms.
机译:几乎没有例外,球形病毒的壳(衣壳)具有二十面体的对称性,由以特殊基序(T数结构)组装的外壳蛋白(亚基)组成。尽管人工蛋白笼的合成是材料科学的一个快速发展的领域,但自组装壳的设计标准可以再现病毒衣壳的显着特性,这只是开始被人们所理解。我们在这里介绍了一个平衡衣壳结构的最小模型,介绍了蛋白质多聚体(capsomers)之间的显式相互作用。使用蒙特卡洛模拟,我们表明该模型可重现体内病毒的主要结构(T型二十面体)和体外观察到的重要非二十面体结构(八面体和立方对称)。我们的模型还可以预测衣壳强度并阐明基因组释放机制。

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