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- W2012124436 abstract "Earlier work has demonstrated the irreversible inactivation of serine and cysteine proteinases by peptides with a C-terminal chloromethyl ketone group. With a C-terminal diazomethyl ketone, on the other hand, peptides become reagents specific for cysteine proteinases. We have now synthesized and examined the properties of reagents with an additional methyl side chain near the reactive grouping with the goal of diminishing side reactions in a cellular environment. Derivatives of neutral amino acids as well as of lysine and arginine have been prepared. The chloroethyl ketones are about 60% less reactive to chemical nucleophiles than the chloromethyl ketones. However, the susceptibilities of the proteases examined varied remarkably. Cathepsins B and L of the papain family of cysteine proteinases were much less susceptible (about 2 orders of magnitude less) to both peptidyl diazoethyl and chloroethyl ketones. In marked contrast, clostripain, a cysteine proteinase of a separate family was decisively more susceptible to chloroethyl ketones. The serine proteinases showed a drop in susceptibility to the chloroethyl ketones generally, and this was similar to the drop in chemical reactivity in proceeding from the chloromethyl to the chloroethyl ketone." @default.
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- W2012124436 date "1989-04-01" @default.
- W2012124436 modified "2023-09-23" @default.
- W2012124436 title "The properties of peptidyl diazoethanes and chloroethanes as protease inactivators" @default.
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- W2012124436 doi "https://doi.org/10.1016/0003-9861(89)90030-1" @default.
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