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• W2039837360 abstract "Theoretical computations are performed of the comparative binding affinities of five polymethylene carboxamide derivatives of 9-aminoacridine to a series of double-stranded hexanucleotides. The purpose of this investigation is to ascertain whether minor groove recognition of a guanine base adjacent to the intercalation site can occur, and be preferentially stabilized, for a given length of the polymethylene side chain, encompassing from n = 2 up to n = 6 methylene groups. For that purpose, several representative sequences were investigated, in which intercalation of the 9-aminoacridine chromophore occurred at a central d(CpG) or d(TpA) step. Investigated were the self-complementary sequences d(CGCGCG)2, d(GCCGGC)2, d(TATATA)2 and d(ATTAAT)2, as well as the 'mixed' sequences d(ACTAAT) .d(ATTAGT) and d(TGTATA). d(TATACA). For n = 3 up to n = 6, such a recognition was enabled only when the guanine base was located downstream of the intercalation site, i.e. with steps d(CGG) and d(TAG). It occurred by means of a bidentate interaction involving, on the one hand, H(N2) and N3 of the base, and, on the other hand, the carbonyl oxygen and the cis amino hydrogen of the terminal formamide moiety of the ligand. Because of the flexibility of the side chain, however, alternative binding modes were also found to occur competitively, involving backbone-only interactions of the side chain. On the basis of the present computations, upon binding to the sequence d(GCCGGC)2, an optimal value of n = 5 could be derived, with the corresponding acridine derivative eliciting both a significant prevalence of the bidentate over backbone only binding mode, and the most favourable energy balance within the investigated series. This privileged value of n = 5 is fully consistent with the experimental results of Markovits et al. and Gaugain et al. The very flexibility of the side chain, however, hampered any preferential recognition of a triplet sequence with a downstream guanine, such as d(CGG) or d(TAG), to be elicited over sequences such as d(TAA), d(TAT) or d(TAC)." @default.
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• W2039837360 date "1990-01-01" @default.
• W2039837360 modified "2023-09-25" @default.
• W2039837360 title "A theoretical investigation of the base sequence preferences of monointercalating polymethylene carboxamide derivatives 9-amlnoacndine" @default.
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• W2039837360 doi "https://doi.org/10.1093/nar/18.4.711" @default.
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