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Common motifs and topological effects in the protein folding transition state.
- Hubner, Isaac A. (author)
- Lindberg, Magnus (author)
-
- Haglund, Ellinor, 1978- (author)
- Stockholms universitet,Institutionen för biokemi och biofysik,Mikael Oliveberg
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- Shakhnovich, Eugene I. (author)
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- (creator_code:org_t)
- Elsevier BV, 2006
- 2006
- English.
- In: Journal of Molecular Biology. - : Elsevier BV. - 0022-2836 .- 1089-8638. ; 359:4, s. 1075-1085
- Journal article (peer-reviewed)
Abstract
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- Through extensive experiment, simulation, and analysis of protein S6 (IRIS), we find that variations in nucleation and folding pathway between circular permutations are determined principally by the restraints of topology and specific nucleation, and affected by changes in chain entropy. Simulations also relate topological features to experimentally measured stabilities. Despite many sizable changes in Φ values and the structure of the transition state ensemble that result from permutation, we observe a common theme: the critical nucleus in each of the mutants share a subset of residues that can be mapped to the critical nucleus residues of the wild-type. Circular permutations create new N and C termini, which are the location of the largest disruption of the folding nucleus, leading to a decrease in both Φ values and the role in nucleation. Mutant nuclei are built around the wild-type nucleus but are biased towards different parts of the S6 structure depending on the topological and entropic changes induced by the location of the new N and C termini.
Keyword
- ensemble
- simulatoin
- circular permutation
- protein S6
Publication and Content Type
- ref (subject category)
- art (subject category)
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