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• W2044431641 endingPage "13592" @default.
• W2044431641 startingPage "13584" @default.
• W2044431641 abstract "A method for the stabilization of transient folding intermediates is presented. Barnase folds and unfolds via such an intermediate. Mutations that destabilize the folded state relative to the folding intermediate had been previously identified from the free energy profiles for the unfolding of mutant proteins. It is predicted that the accumulation of such mutations should lead to the intermediate being the most stable species at certain concentrations of denaturant. Mutants were prepared that contained combinations of such mutations. The behavior of these mutants on urea denaturation was studied by probes for tertiary structure (fluorescence, near-UV CD), secondary structure (far-UV CD), and hydrodynamic volume (size-exclusion chromatography). Whereas wild-type shows a two-state transition in all cases, with the same thermodynamic values being found by all probes, some of the mutants show different transitions with different structural probes. On increasing concentration of denaturant, the tertiary structure of these mutants is lost before all the secondary structure and before the protein shows the maximum expanded volume that is characteristic of the unfolded state. These mutants thus accumulate an intermediate state at equilibrium under certain urea concentrations. The intermediate state retains some degree of secondary structure but has a disrupted tertiary structure, and its degree of compactness is intermediate between the folded and the unfolded forms, probably expanding with increasing concentration of denaturant. The accumulation of the intermediate should allow its direct characterization by spectroscopy, especially NMR." @default.
• W2044431641 created "2016-06-24" @default.
• W2044431641 creator A5066401724 @default.
• W2044431641 creator A5068711489 @default.
• W2044431641 date "1993-12-14" @default.
• W2044431641 modified "2023-10-14" @default.
• W2044431641 title "Rationally designing the accumulation of a folding intermediate of barnase by protein engineering" @default.
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• W2044431641 doi "https://doi.org/10.1021/bi00212a026" @default.
• W2044431641 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/8257694" @default.
• W2044431641 hasPublicationYear "1993" @default.
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