期刊
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
卷 -, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1742-5468/2015/01/P01034
关键词
rigorous results in statistical mechanics; random/ordered microstructures (theory); mechanical properties (DNA; RNA; membranes; bio-polymers) (theory); polymers; polyelectrolytes and biomolecular solutions
资金
- NIH [GM073857]
We present the exact solution of a microscopic statistical mechanical model for the transformation of a long polypeptide between an unstructured coil conformation and an alpha-helix conformation. The polypeptide is assumed to be adsorbed to the interface between a polar and a non-polar environment such as realized by water and the lipid bilayer of a membrane. The interfacial coil-helix transformation is the first stage in the folding process of helical membrane proteins. Depending on the values of model parameters, the conformation changes as a crossover, a discontinuous transition, or a continuous transition with helicity in the role of order parameter. Our model is constructed as a system of statistically interacting quasiparticles that are activated from the helix pseudo-vacuum. The particles represent links between adjacent residues in coil conformation that form a self-avoiding random walk in 2D. Explicit results are presented for helicity, entropy, heat capacity and the average numbers and sizes of both coil and helix segments.
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