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• W2808766279 abstract "Conformational entropy is expected to contribute significantly to the thermodynamics of structural transitions in intrinsically disordered proteins or regions in response to protein/ligand binding, posttranslational modifications, and environmental changes. We calculated the backbone (dihedral) conformational entropy of oligoglycine (GlyN), a protein backbone mimic and model intrinsically disordered region, as a function of chain length (N=3, 4, 5, 10, and 15) from simulations using three different approaches. The backbone conformational entropy scales linearly with chain length with a slope consistent with the entropy of folding of well-structured proteins. The entropic contributions of second-order dihedral correlations are predominantly through intraresidue ϕ-ψ pairs, suggesting that oligoglycine may be thermodynamically modeled as a system of independent glycine residues. We find the backbone conformational entropy to be largely independent of global structural parameters, like the end-to-end distance and radius of gyration. We introduce a framework referred to herein as ensemble confinement to estimate the loss (gain) of conformational free energy and its entropic component when individual residues are constrained to (released from) particular regions of the ϕ-ψ map. Quantitatively, we show that our protein backbone model resists ordering/folding with a significant, unfavorable ensemble confinement free energy because of the loss of a substantial portion of the absolute backbone entropy. Proteins can couple this free-energy reservoir to distal binding events as a regulatory mechanism to promote or suppress binding." @default.
• W2808766279 created "2018-06-29" @default.
• W2808766279 creator A5049887816 @default.
• W2808766279 creator A5075120675 @default.
• W2808766279 date "2018-06-01" @default.
• W2808766279 modified "2023-10-17" @default.
• W2808766279 title "Thermodynamics of Conformational Transitions in a Disordered Protein Backbone Model" @default.
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• W2808766279 doi "https://doi.org/10.1016/j.bpj.2018.04.027" @default.
• W2808766279 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6026333" @default.
• W2808766279 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29925017" @default.
• W2808766279 hasPublicationYear "2018" @default.
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