A microgonotropen branched decaaza decabutylamine and its DNA and DNA/transcription factor interactions
作者:Thomas C. Bruice、Dipanjan Sengupta、Andrei Blaskó、S.-Y. Chiang、T.A. Beerman
DOI:10.1016/s0968-0896(97)00011-4
日期:1997.4
The central pyrrole of a site selective DNA minor groove binding tripyrrole peptide 1 has been attached to a branched decaaza decabutylamine via a -(CH2)(3)-NHCO-(CH2)(3)- linker to provide the decaaza-microgonotropen (8). The decaaza decabutylamine moiety of 8 was designed to have a much greater affinity to the phosphodiester linkages of the backbone of DNA. Employing Hoechst 33258 (I-It) as a fluorescent titrant, the equilibrium constants for the binding of 8 to the hexadecameric duplex d(GGCGCA(3)T(3)GGCGG)/d(CCGCCA(3)T(3)GCGCC) and to calf thymus DNA were determined. The log of the product of equilibrium constants (log KL1KL2) for 1:1 and 1:2 complexes formation at A(3)T(3) is 17 (35 degrees C). Results of studies of the inhibition of the binding of several proteins to target DNA are discussed. Binding of the E2F1 transcription factor to its DNA target is 50% inhibited at similar to 2 nM concentration of 8. (C) 1997 Elsevier Science Ltd.