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- W2016936711 abstract "Folding of bovine pancreatic ribonuclease A (RNase A) is a sequential process which involves the formation of well-populated structural intermediates under suitable conditions. Two intermediates have been detected on the major slow-refolding pathway of RNase A: a late intermediate (IN) which already resembles the native protein in a number of properties and a rapidly formed early intermediate (I1) which shows extensive hydrogen-bonded secondary structure. Here competition experiments between refolding and proteolytic cleavage of the peptide chain are described which yield information about the decrease in accessibility of particular proteolytic cleavage sites during the folding process. Results obtained with pepsin as a proteolytic probe of folding indicate that the primary cleavage site for pepsin, Phe-120-Asp-121, becomes inaccessible early in the course of refolding, if folding is carried out under conditions which effectively stabilize the native state. Under marginally stable conditions, folding is very slow, and protection against peptic cleavage is not detectable prior to the final formation of native protein. The comparison with amide proton exchange experiments suggests that the protection against peptic cleavage occurs during the formation and/or stabilization of hydrogen-bonded secondary structure in the early intermediate (I1). We conclude that the carboxy-terminal region of the RNase peptide chain, which is known to be important for the stability of the folded protein, may also be relevant for early steps of refolding." @default.
- W2016936711 created "2016-06-24" @default.
- W2016936711 creator A5004538725 @default.
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- W2016936711 date "1984-05-08" @default.
- W2016936711 modified "2023-09-25" @default.
- W2016936711 title "An early intermediate in the folding of ribonuclease A is protected against cleavage by pepsin" @default.
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- W2016936711 doi "https://doi.org/10.1021/bi00305a004" @default.
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