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- W1995464372 abstract "Abstract One of the histidine residues in swine pepsinogen can be modified in a rapid reaction with diethyl pyrocarbonate (DEP). At the same time, the potential proteolytic activity of the zymogen is reduced to 40% of its initial value. Reaction at the histine residue is reversed by neutral hydroxylamine, but the loss in activity is not. Fractionation of DEP-pepsinogen activation mixtures gave fully active pepsin in reduced yield, not modified enzyme with reduced specific activity. This was taken to indicate that the reaction had produced a mixture of products. Irreversible incorporation of [ 14 C]DEP indicates that carbethoxy groups are incorporated into the molecule at amino acids other than histidine. The positions of these carbethoxy groups were determined by tryptic digestion and hplc. Modification was found to have occurred, in nonstoichiometric amounts, at lysine residues 3 and 9 and at leucine 1. Control experiments showed that activation was not affected by reaction at leucine 1, indicating that inactivation is caused by reaction at one or more of the lysine residues." @default.
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- W1995464372 date "1981-10-01" @default.
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- W1995464372 title "Diethyl pyrocarbonate inactivates swine pepsinogen by reaction at amino groups" @default.
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- W1995464372 doi "https://doi.org/10.1016/0003-9861(81)90479-3" @default.
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