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• W2049649016 endingPage "707" @default.
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• W2049649016 abstract "Multidomain protein folding is often more complex than a two-state process, which leads to the spontaneous folding of the native state. Pepsin, a zymogen-derived enzyme, without its prosegment (PS), is irreversibly denatured and folds to a thermodynamically stable, non-native conformation, termed refolded pepsin, which is separated from native pepsin by a large activation barrier. While it is known that PS binds refolded pepsin and catalyzes its conversion to the native form, little structural details are known regarding this conversion. In this study, solution NMR was used to elucidate the PS-catalyzed folding mechanism by examining the key equilibrium states, e.g. native and refolded pepsin, both in the free and PS-bound states, and pepsinogen, the zymogen form of pepsin. Refolded pepsin was found to be partially structured and lacked the correct domain-domain structure and active-site cleft formed in the native state. Analysis of chemical shift data revealed that upon PS binding refolded pepsin folds into a state more similar to that of pepsinogen than to native pepsin. Comparison of pepsin folding by wild-type and mutant PSs, including a double mutant PS, indicated that hydrophobic interactions between residues of prosegment and refolded pepsin lower the folding activation barrier. A mechanism is proposed for the binding of PS to refolded pepsin and how the formation of the native structure is mediated." @default.
• W2049649016 created "2016-06-24" @default.
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• W2049649016 creator A5059993475 @default.
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• W2049649016 date "2014-01-01" @default.
• W2049649016 modified "2023-10-13" @default.
• W2049649016 title "Understanding the Mechanism of Prosegment-catalyzed Folding by Solution NMR Spectroscopy" @default.
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• W2049649016 doi "https://doi.org/10.1074/jbc.m113.505891" @default.
• W2049649016 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3887198" @default.
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• W2049649016 hasPublicationYear "2014" @default.
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