Abstract
The binding of closed circular DNA to proteins involves significant alterations in both the secondary and tertiary structure of the DNA. The effects on the DNA secondary structure are often manifested by the formation of bends or kinks, as well as by changes in the helical repeat or other duplex winding parameter. The effects on the DNA tertiary structure can be either local or global in nature. For example, the tertiary structure can change locally as a consequence of wrapping of a portion of the DNA on a protein surface. More generally, global DNA tertiary structural alterations can arise as a consequence of the requirement that the linking number remain constant as long as the topological constraint is maintained. As a result, the three-dimensional configuration of the DNA axis may be significantly altered compared to a DNA that is topologically unconstrained.
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Bauer, W.R., White, J.H. (1990). Surface Linking and Helical Repeat of Protein-Wrapped DNA. In: Eckstein, F., Lilley, D.M.J. (eds) Nucleic Acids and Molecular Biology 4. Nucleic Acids and Molecular Biology, vol 4. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-84150-7_3
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DOI: https://doi.org/10.1007/978-3-642-84150-7_3
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