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• W2121415706 abstract "Type II DNA topoisomerases are targets of acridine drugs. Nine mutations conferring resistance to acridines were obtained by forced molecular evolution, using methyl N-(4'-(9-acridinylamino)-3-methoxy-phenyl) methane sulfonamide (mAMSA), methyl N-(4'-(9-acridinylamino)-2-methoxy-phenyl) carbamate hydrochloride (mAMCA), methyl N-(4'-(9-acridinylamino)-phenyl) carbamate hydrochloride (AMCA), and N-[2-(dimethylamino)ethyl]acridines-4-carboxamide (DACA) as selection agents. Mutations betaH514Y, betaE522K, betaG550R, betaA596T, betaY606C, betaR651C, and betaD661N were in the B' domain, and betaG465D and betaP732L were not. With AMCA, four mutations were selected (betaE522K, betaG550R, betaA596T, and betaD661N). Two mutations were selected with mAMCA (betaY606C and betaR651C) and two with mAMSA (betaG465D and betaP732L). It is interesting that there was no overlap between mutation selection with AMCA and mAMSA or mAMCA. AMCA lacks the methoxy substituent present in mAMCA and mAMSA, suggesting that this motif determines the mutations selected. With the fourth acridine DACA, five mutations were selected for resistance (betaG465D, betaH514Y, betaG550R, betaA596T, and betaD661N). betaG465D was selected with both DACA and mAMSA, and betaG550R, betaA596T, and betaD661N were selected with both DACA and AMCA. DACA lacks the anilino motif of the other three drugs but retains the acridine ring motif. The overlap in selection with DACA and mAMSA or AMCA suggests that altered recognition of the acridine moiety may be involved in these mutations. We used restriction fragment length polymorphisms and heteroduplex analysis to demonstrate that some mutations were selected multiple times (betaG465D, betaE522K, betaG550R, betaA596T, and betaD661N), whereas others were selected only once (betaH514Y, betaY606C, betaR651C, and betaP732L). Here, we compare the drug resistance profile of all nine mutations and report the biochemical characterization of three, betaG550R, betaY606C, and betaD661N." @default.
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• W2121415706 date "2007-01-05" @default.
• W2121415706 modified "2023-09-24" @default.
• W2121415706 title "Differential Selection of Acridine Resistance Mutations in Human DNA Topoisomerase IIβ Is Dependent on the Acridine Structure" @default.
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• W2121415706 doi "https://doi.org/10.1124/mol.106.032953" @default.
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