In a search for new inhibitors of the nuclear enzyme poly(ADP-ribose) synthetase, it was found that various benzamides substituted in the 3-position were the most inhibitory compounds found to date. Two of the benzamides, 3-aminobenzamide and 3-methoxybenzamide, were found to be competitive inhibitors, with Ki values or less than 2 microM.

ADP-ribosylation can be defined as the postsynthetic modification of protein by the covalent attachment of the ADP-ribose moiety of NAD+. ADP-ribosylation of elongation-factor Tu is

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