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- W2004736277 abstract "In an effort to further develop the technique of isomer-specific proteolysis, a number of proline-containing substrates were subjected to hydrolysis in the presence of chymotrypsin, trypsin, or prolidase. The objective was to determine whether direct hydrolysis of the cis form of the substrate could occur and, if so, the extent to which it is slower than the hydrolysis of the equivalent trans form. It is shown that for both peptide and amide substrates, which contain proline at the P2 position, the cis form can be hydrolyzed directly by either chymotrypsin or trypsin, in contrast to earlier suggestions in the literature. For similar amide substrates, it was found that chymotrypsin has a lower catalytic efficiency for the cis form, relative to the trans form, by a factor of 20 000 while, for trypsin and its substrate, the cis form was cleaved about 2000 times less efficiently. Results for a trypsin substrate with proline at the P2' position, rather than the P2 position, were quite different however, since there was no indication that the cis form could be directly cleaved even at the highest enzyme concentration. There was also no indication that prolidase could cleave the dipeptide Phe-Pro when the active bond itself is in the cis form. These collective results suggest that the ability of proteases to cleave a substrate with a cis peptide bond depends strongly on the location of the cis bond relative to the active bond that is being cleaved." @default.
- W2004736277 created "2016-06-24" @default.
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- W2004736277 date "1985-11-01" @default.
- W2004736277 modified "2023-10-18" @default.
- W2004736277 title "Isomer-specific proteolysis of model substrates: influence that the location of the proline residue exerts on cis trans specificity" @default.
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- W2004736277 doi "https://doi.org/10.1021/bi00344a034" @default.
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