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- W2076564663 abstract "The influence of DNA structure on topoisomerase I-DNA interaction has been investigated using a high affinity binding site and mutant derivatives thereof. Parallel determinations of complex formation and helix structure in the absence of superhelical stress suggest that the interaction is intensified by stable helix curvature. Previous work showed that a topoisomerase I binding site consists of two functionally distinct subdomains. A region located 5' to the topoisomerase I cleavage site is essential for binding. The region 3' to the cleavage site is covered by the enzyme, but not essential. We report here that the helix conformation of the latter region is an important modulator of complex formation. Thus, complex formation is markedly stimulated, when an intrinsically bent DNA segment is installed in this region. A unique pattern of phosphate ethylation interferences in the 3'-part of the binding site indicates that sensing of curvature involves backbone contacts. Since dynamic curvature in supercoiled DNA may substitute for stable curvature, our findings suggest that topoisomerase I is able to probe DNA topology by assessment of writhe, rather than twist." @default.
- W2076564663 created "2016-06-24" @default.
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- W2076564663 date "1991-01-01" @default.
- W2076564663 modified "2023-09-25" @default.
- W2076564663 title "Eukaryotic topoisomerase I-DNA interaction is stabilized by helix curvature" @default.
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- W2076564663 doi "https://doi.org/10.1093/nar/19.6.1235" @default.
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