NMR assignments and solution conformation of the DNA.RNA hybrid duplex d(GTGAACTT).r(AAGUUCAC).
NMR assignments and solution conformation of the DNA.RNA hybrid duplex d(GTGAACTT).r(AAGUUCAC).
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DNA.RNA 杂合双链体 d(GTGAACTT).r(AAGUUCAC) 的 NMR 分配和溶液构象。
DOI:
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发表时间:
1993
期刊:
影响因子:
--
通讯作者:
Tom Brown
中科院分区:
文献类型:
--
作者:
Andrew N. Lane;S. Ebel;Tom Brown
Nearly complete assignments of the 1H-NMR spectrum of the DNA.RNA hybrid d(GTGAACTT).r(AAGUUCAC) have been obtained by two-dimensional methods. Three-bond coupling constants measured from cross-sections of two-dimensional NOE spectra and double quantum-filtered correlation spectra showed that the sugars in the DNA strand are predominantly in the S domain of puckers, whereas the ribofuranoses are mainly C3'-endo. Analysis of time-dependent NOE intensities from one- and two-dimensional experiments showed that the glycosidic torsion angles in the DNA strand are near -120 degrees, whereas those in the RNA strand are in the range- 140 degrees to -160 degrees. These nucleotide conformations correspond to those typically found in B-DNA and A-RNA, respectively. The circular dichroism of the duplex is similar to that of A-form RNA, consistent with a global A-like conformation. A large number of duplex structures was generated in which the nucleotides were fixed in the experimentally determined conformations. A subset of these structures was found that satisfied the internucleotide NOE intensities, backbone constraints and had acceptable Lennard-Jones energies. The base pairs in the duplex were found to have positive inclinations, a translation (Dx) of about 0.4 nm from the helix axis, and more than 10 bp/turn on average. This implies a helical structure in the A family of conformations.
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