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- W2079572506 abstract "CC-1065, Benzo[1,2-b:4,3-b']dipyrrole-3(2H)-carboxamide, 7-[[1,6-dihydro-4-hydroxy-5-methoxy-7-[(4,5,8,8a-tetrahydro-7-methyl-4- oxocyclopropa[c]pyrrolo[3,2-e]indol-2(1H)-yl)carbonyl]benzo [1,2-b:4,3-b']dipyrrol-3(2H)-yl]carbonyl]-1,6-dihydro-4-hydroxy- 5-methoxy-, (7bR,8aS), binds to the B form of poly(dl-5BrdC).poly(dl-5BrdC) to yield a reversibly bound species whose stability with respect to an irreversibly bound species (presumably the inosine N-3 adduct) is much greater than it is for other DNA polymers. Competitive binding experiments with netropsin, show that this reversibly bound species of CC-1065 contains CC-1065 in the minor groove of the double helix. A review of the CC-1065 binding data obtained on other synthetic DNA polymers suggests that the widely different rates of species conversion shown by these polymers may result from small differences in DNA secondary structure rather than from different alkylating abilities of the adenine or inosine N-3 active site. CC-1065 converts the Z-form of poly(dl-5BrdC).poly(dl-5BrdC) in 3.5 M sodium chloride to the B form and does not bind to the Z form in this solvent system. CC-1065 bound to the B form polymer inhibits the formation of the Z form if the helix is saturated with CC-1065. Regions of the polymer without bound CC-1065 can convert to the Z form with added salt, producing a situation where the polymer contains both the B and Z conformations. In 4.0 M sodium chloride, where the Z conformation is also predominate, the addition of CC-1065 causes chiral aggregates to form, and CC-1065 binds to the aggregates. The addition of dimethylformamide in the absence of CC-1065 or a simple dilution of the 4.0 M sodium chloride polymer solution with water also causes aggregation, indicating that the Z form of this polymer in 4.0 M sodium chloride is unstable with respect to an aggregated form." @default.
- W2079572506 created "2016-06-24" @default.
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- W2079572506 date "1987-01-01" @default.
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- W2079572506 title "A circular dichroism study of the binding of CC-1065 to B and Z form poly(dl-5BrdC)·poly(dl-5BrdC)" @default.
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- W2079572506 doi "https://doi.org/10.1016/0009-2797(87)90028-7" @default.
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