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- Title
Thermodynamics of force-dependent folding and unfolding of small protein and nucleic acid structures.
- Authors
Yao, Mingxi; Chen, Hu; Yan, Jie
- Abstract
In this paper, we outline the theoretical framework for understanding the equilibrium force-dependent folding and unfolding transitions of protein domains and small nucleic acid structures, both having small rigid folded structures and highly flexible unfolded polymeric chain conformations. A complete statistical description of the state described by the probability function ρξ(n,x), is obtained, where n is an index denoting the structural state, and x is the extension of the molecule. ξ denotes an external constraint applied to the molecule, which is either a constant force or a harmonic spring attached to one end of the molecule. The extension probability distribution regardless of the structural state: UGRAPHIC DISPLAY="INLINE" ID="UGT1" SRC="UGT1"/, the free energy landscape: −kBT ln(ρξ(x)), and the probability of the states regardless of the extension: UGRAPHIC DISPLAY="INLINE" ID="UGT2" SRC="UGT2"/, are analyzed using the force-dependent structural transitions of the classic titin I27 domain as an example. The impact of different external constraints is also discussed.
- Publication
Integrative Biology, 2015, Vol 7, Issue 10, p1154
- ISSN
1757-9694
- Publication type
Article
- DOI
10.1039/c5ib00038f