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- W2108367936 abstract "Although highly stable toward unfolding, native ribonuclease A is known to be cleaved by unspecific proteases in the flexible loop region near Ala20. With the aim to create a protease-resistant ribonuclease A, Ala20 was substituted for Pro by site-directed mutagenesis. The resulting mutant enzyme was nearly identical to the wild-type enzyme in the near-UV and far-UV circular dichroism spectra, in its activity to 2′,3′-cCMP and in its thermodynamic stability. However, the proteolytic resistance to proteinase K and subtilisin Carlsberg was extremely increased. Pseudo-first-order rate constants of proteolysis, determined by densitometric analysis of the bands of intact protein in SDS–PAGE, decreased by two orders of magnitude. In contrast, the rate constant of proteolysis with elastase was similar to that of the wild-type enzyme. These differences can be explained by the analysis of the fragments occurring in proteolysis with elastase. Ser21–Ser22 was identified as the main primary cleavage site in the degradation of the mutant enzyme by elastase. Obviously, this bond is not cleavable by proteinase K or subtilisin Carlsberg. The results demonstrate the high potential of a single mutation in protein stabilization to proteolytic degradation." @default.
- W2108367936 created "2016-06-24" @default.
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- W2108367936 date "2001-10-01" @default.
- W2108367936 modified "2023-10-11" @default.
- W2108367936 title "Increased proteolytic resistance of ribonuclease A by protein engineering" @default.
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- W2108367936 doi "https://doi.org/10.1093/protein/14.10.791" @default.
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