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• W2003207344 abstract "In this study, we have systematically compared the uranyl photocleavage of a range of bent A-tracts and nonbent TA-tracts as well as interrupted A-tracts. We demonstrate that uranyl photocleavage of A-tracts and TA-tracts is almost identical, indicating a very similar minor groove conformation. Furthermore, a 10 base pair A-tract is divided into two independent tracts by an intervening TA or GC step. Uranyl probing also clearly distinguishes the bent A4T4 and the nonbent T4A4 sequences as adopting different structures, and our interpretation of the data is consistent with a structure for the bent A4T4 sequence that resembles a continuous A-tract, whereas the nonbent T4A4 sequences are closer to two independent and opposite A-tracts that cancel each other in terms of macroscopic bending. Finally, we also note that even single TA and TAT steps are highly sensitive to uranyl photocleavage and propose that in addition to avarage minor groove width, uranyl also senses DNA helix flexibility/deformability. Thus, the structural difference of TA-tracts and A-tracts may to a large extent reflect a difference in flexibility, and DNA curvature may consequently require a rigid narrow minor groove conformation that creates distinct A-tract−B-DNA junctions as the predominant cause of the bending." @default.
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• W2003207344 date "2005-05-01" @default.
• W2003207344 modified "2023-09-23" @default.
• W2003207344 title "Uranyl Photoprobing of Nonbent A/T- and Bent A-Tracts. A Difference of Flexibility?" @default.
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• W2003207344 doi "https://doi.org/10.1021/bi0502083" @default.
• W2003207344 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15909999" @default.
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