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- W2083802015 abstract "The extracellular proteinases of the anaerobe Porphyromonas gingivalis, are implicated in the destruction of host defence mechanisms in periodontitis. We have previously purified one of these enzymes, α-gingivain, and established that it belongs to the cysteine proteinase family of enzymes. In the present study, transposon Tn4351 was used to alter the open reading frame encoding a region that includes the catalytic site of α-gingivain by targeted mutagenesis. Escherichia coli HB101 which harbours R751 was used to introduce the transposon into P. gingivalis ATCC 33277 by conjugal transfer. E. coli was transformed using the altered plasmid with a Cla I site insertion of a sequence common to the catalytic site histidine or cysteine of many cysteine proteinases. The frequency of the transconjugation was 4.5 × 105 while the recipient viable counts comprised 60% of the original P. gingivalis. The result of this targeted mutagenesis was inactivation of gingivains such that some colonies on skimmed-milk agar plates showed no clear surrounding zones of hydrolysis and their normal catalytic activity towards L-BAPNA was destroyed." @default.
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- W2083802015 title "Catalytic site targeted mutagenesis of the α-gingivain gene of Porphyromonas gingivalis using Tn-4351 to generate isogenic mutants" @default.
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- W2083802015 doi "https://doi.org/10.1016/s1075-9964(95)80431-5" @default.
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