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arXiv 1503.07965q-bio.BMcond-mat.softphysics.bio-ph
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蛋白质序列和构象空间的拓扑透视

A topological perspective into the sequence and conformational space of proteins

K. Silpaja Chandrasekar, M. V. Sangaranarayanan

摘要:

氨基酸的精确序列在蛋白质的三级结构及其功能特性中起着核心作用。疏水极性晶格模型提供了有关能源景观的宝贵见解。我们在这里证明了蛋白质序列和可设计的结构之间的同构非常长的氨基酸链的二维和三维lattice蛋白质使用精确的计数和直观的considerations.We强调,氨基酸残基的拓扑安排单独是足够的推导出可设计的和不可设计的序列,而无需明确的求助于能量和简并。结果表明,在二维和三维的蛋白质的现实晶格模型的计算可行性,并暗示,结构的设计的基本原则是疏水性和极性残基的连接。

英文摘要:

The precise sequence of aminoacids plays a central role in the tertiary structure of proteins and their functional properties. The Hydrophobic-Polar lattice models have provided valuable insights regarding the energy landscape. We demonstrate here the isomorphism between the protein sequences and designable structures for two and three dimensional lattice proteins of very long aminoacid chains using exact enumerations and intuitive considerations.We emphasize that the topological arrangement of the aminoacid residues alone is adequate to deduce the designable and non-designable sequences without explicit recourse to energetics and degeneracies. The results indicate the computational feasibility of realistic lattice models for proteins in two and three dimensions and imply that the fundamental principle underlying the designing of structures is the connectivity of the hydrophobic and polar residues.

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