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• W1991093914 abstract "The conformation of DNA complexes formed with various 3-amino- and 3,8-diamino-phenanthridinium derivatives were examined by CD and fluorescence methods. The CD of these complexes is characterized by major bands in the 300–350-nm and the 400–550-nm regions. The CD properties of the complexes formed with diaminophenanthridinium derivatives suggest that the structure of such complexes is well represented by the intercalation complex formed between DNA and ethidium bromide. The substantial and regular increases in ellipticities near 308 nm that occur with increasing DNA-bound diaminophenanthridinium to DNA phosphate ratios (r) may result from direct interactions between molecules intercalated in neighbouring binding sites. In contrast, the changes in the shape of the CD of DNA complexes of monoaminophenanthridinium derivatives with r and the much lower maximum ellipticities attained suggest that near-neighbor interactions among intercalated monoaminophenanthridinium derivatives occur much less efficiently than in the corresponding diamino complexes, if at all. Although alternative explanations for the differences in the optical properties between the mono- and diaminophenanthridinium complexes of DNA may be offered, such results seem to indicate that complexes formed with monoaminophenanthridinium derivatives are characterized by a conformation which is quite distinct and different from that of the DNA–diaminophenanthridinium complexes. This conclusion is further supported by the considerable increase in fluorescence that accompanies the binding of the diaminophenanthridinium derivatives to DNA as compared to the minor increases, which occur upon the binding of the monoaminophenanthridinium compounds. The importance of conformation as a factor influencing template, function, especially with respect to the RNA polymerase-catalyzed synthesis of RNA, is now well appreciated. Therefore, methods which could provide information readily about changes in the conformation of a template, i.e., as a result of dye intercalation, are expected to facilitate our understanding of the effects of conformational change on the function and activity of templates." @default.
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• W1991093914 date "1978-06-01" @default.
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• W1991093914 title "Differences in circular dichroism and fluorescence between the DNA complexes formed with 3-amino- and 3,8- diaminophenanthridinium derivatives" @default.
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• W1991093914 doi "https://doi.org/10.1002/bip.1978.360170607" @default.
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