. . . . . . . . "3000-fold reduction in activity; abolishes hydrolysis of the covalent intermediate between the active site nucleophile and DNA." . "254"^^ . . "254"^^ . . . . . . "15000-fold reduction in activity." . "254"^^ . . "254"^^ . . "Mutagenesis site occurs in NX_Q9NUW8-2 at amino acids 254 - 254." . . . . . . "neXtProt gold" . . . . . . . . . . . . . "2014-09-19T00:00:00.0Z"^^ . . . "neXtProt database" . "CALIPHO project" . . . . . "2" . . . . .