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• W2066622830 abstract "Tomaymycin reacts covalently with guanine in the DNA minor groove, exhibiting considerable specificity for the flanking bases. The sequence dependence of tomaymycin bonding to DNA was investigated in synthetic DNA oligomers and polymers. The maximum extent of bonding to DNA is greater for homopurine and natural DNA sequences than for alternating purine-pyrimidine sequences. Saturation of DNA with tomaymycin has little effect on the melting temperature in the absence of unbound drug. Fluorescence lifetimes were measured for DNA adducts at seven of the ten unique trinucleotide bonding sites. Most of the adducts had two fluorescence lifetimes, representing two of the four possible binding modes. The lifetimes cluster around 2-3 ns and 5-7 ns; the longer lifetime is the major component for most bonding sites. The two lifetime classes were assigned to R and S diastereomeric adducts by comparison with previous NMR results for oligomer adducts. The lifetime difference between binding modes is interpreted in terms of an anomeric effect on the excited-state proton transfer reaction that quenches tomaymycin fluorescence. Bonding kinetics of polymer adducts were monitored by fluorescence lifetime measurements. Rates of adduct formation vary by two orders of magnitude with poly(dA-dG).poly(dC-dT), reacting the fastest at 4 x 10(-2) M-1 s-1. The sequence specificity of tomaymycin is discussed in light of these findings and other reports in the literature." @default.
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• W2066622830 date "1996-04-01" @default.
• W2066622830 modified "2023-09-29" @default.
• W2066622830 title "Time-resolved fluorescence studies of tomaymycin bonding to synthetic DNAs" @default.
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• W2066622830 doi "https://doi.org/10.1016/s0006-3495(96)79756-4" @default.
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