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Evolution of a protein folding nucleus.

Title: Evolution of a protein folding nucleus.
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Name(s): Xia, Xue, author
Longo, Liam M, author
Sutherland, Mason A, author
Blaber, Michael, author
Type of Resource: text
Genre: Journal Article
Text
Date Issued: 2016-07-01
Physical Form: computer
Physical Form: online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: The folding nucleus (FN) is a cryptic element within protein primary structure that enables an efficient folding pathway and is the postulated heritable element in the evolution of protein architecture; however, almost nothing is known regarding how the FN structurally changes as complex protein architecture evolves from simpler peptide motifs. We report characterization of the FN of a designed purely symmetric β-trefoil protein by ϕ-value analysis. We compare the structure and folding properties of key foldable intermediates along the evolutionary trajectory of the β-trefoil. The results show structural acquisition of the FN during gene fusion events, incorporating novel turn structure created by gene fusion. Furthermore, the FN is adjusted by circular permutation in response to destabilizing functional mutation. FN plasticity by way of circular permutation is made possible by the intrinsic C3 cyclic symmetry of the β-trefoil architecture, identifying a possible selective advantage that helps explain the prevalence of cyclic structural symmetry in the proteome.
Identifier: FSU_pmch_26610273 (IID), 10.1002/pro.2848 (DOI), PMC4918426 (PMCID), 26610273 (RID), 26610273 (EID)
Keywords: Folding pathway, Folding transition state, Phi-value, Protein design, Protein symmetry, β-trefoil
Publication Note: This NIH-funded author manuscript originally appeared in PubMed Central at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4918426.
Subject(s): Computational Biology/methods
Evolution, Molecular
Gene Fusion
Models, Molecular
Protein Folding
Protein Structure, Secondary
Proteins/chemistry
Proteins/genetics
Thermodynamics
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_pmch_26610273
Owner Institution: FSU
Is Part Of: Protein science : a publication of the Protein Society.
1469-896X
Issue: iss. 7, vol. 25

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Xia, X., Longo, L. M., Sutherland, M. A., & Blaber, M. (2016). Evolution of a protein folding nucleus. Protein Science : A Publication Of The Protein Society. Retrieved from http://purl.flvc.org/fsu/fd/FSU_pmch_26610273