Distance measures and evolution of polymer chains in their topological space

• Main Authors: Mashaghi, Alireza, Ramezanpour, Abolfazl
• Format: Journal Article
• Language: English
• Published: 01.09.2015
• Subjects: Physics - Disordered Systems and Neural Networks; Physics - Soft Condensed Matter; Physics - Statistical Mechanics
• DOI: 10.48550/arxiv.1509.00444

RSC Soft Matter, 2015, 11, 6576-6585 Conformational transitions are ubiquitous in biomolecular systems, have significant functional roles and are subject to evolutionary pressures. Here we provide a first theoretical framework for topological transition, i.e. conformational transitions that are associated with changes in molecular topology. For folded linear biomolecules, arrangement of intramolecular contacts is identified as a key topological property, termed as circuit topology. Distance measures are proposed as reaction coordinates to represent progress along a pathway from initial topology to final topology. Certain topological classes are shown to be more accessible from a random topology. We study dynamic stability and pathway degeneracy associated with a topological reaction and found that off-pathways might seriously hamper evolution to desired topologies. Finally we present an algorithm for estimating the number of intermediate topologies visited during a topological reaction. The results of this study are relevant to, among others, structural studies of RNA and proteins, analysis of topologically associated domains in chromosomes, and molecular evolution.