Geometrical aspects of protein folding

Details Geometrical aspects of protein folding Geometrical aspects of protein folding

2001-05-10

arxiv.org/abs/cond-mat/0105209v1

Physics

Condensed Matter

Statistical Mechanics

Lectures held at the "Enrico Fermi Summer School" - Varenna. 35 pages, 23 figures

Scientific paper

These lectures will address two questions. Is there a simple variational principle underlying the existence of secondary motifs in the native state of proteins? Is there a general approach which can qualitatively capture the salient features of the folding process and which may be useful for interpreting and guiding experiments? Here, we present three different approaches to the first question, which demonstrate the key role played by the topology of the native state of proteins. The second question pertaining to the folding dynamics of proteins remains a challenging problem -- a detailed description capturing the interactions between amino acids among each other and with the solvent is a daunting task. We address this issue building on the lessons learned in tackling the first question and apply the resulting method to the folding of various proteins including HIV protease and membrane proteins. The results that will be presented open a fascinating perspective: the two questions appear to be intimately related. The variety of results reported here all provide evidence in favour of the special criteria adopted by nature in the selection of viable protein folds, ranging from optimal compactness to maximum dynamical and geometrical accessibility of the native states.

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