Related ArticlesNMR evidence for mechanical coupling of phosphate B(I)-B(II) transitions with deoxyribose conformational exchange in DNA.
J Mol Biol. 2001 Aug 3;311(1):149-60
Authors: Isaacs RJ, Spielmann HP
The conformational exchange of the phosphate and deoxyribose groups of the DNA oligomers d(GCGTACGC)(2) and d(CGCTAGCG)(2) have been investigated using a combination of homonuclear and heteronuclear NMR techniques. Two-state exchange between phosphate B(I) and B(II) conformations and deoxyribose N and S conformations was expressed as percent population of the major conformer, %B(I) or %S. Sequence context-dependent variations in %B(I) and %S were observed. The positions of the phosphate and deoxyribose equilibria provide a quantitative measure of the ps to ns timescale dynamic exchange processes in the DNA backbone. Linear correlations between %B(I), %S, and previously calculated model free (13)C order parameters (S(2)) were observed. The %B(I) of the phosphates were found to be correlated to the S(2) of the flanking C3' and C4' atoms. The %B(I) was also found to be correlated with the %S and C1' S(2) of the deoxyribose ring 5' of the phosphates. The %B(I) of opposing phosphates is correlated, while the %B(I) of sequential phosphates is anti-correlated. These correlations suggest that conformational exchange processes in DNA are coupled to each other and are modulated by DNA base sequence, which may have important implications for DNA-protein interactions.
[NMR thesis] I. Quantum-mechanical chemical exchange. II. NMR of semiconductors
I. Quantum-mechanical chemical exchange. II. NMR of semiconductors
Kurur, Narayanan Damodaran (1992) I. Quantum-mechanical chemical exchange. II. NMR of semiconductors. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechTHESIS:09022011-090934651
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NMR evidence for mechanical coupling of phosphate B(I)-B(II) transitions with deoxyri
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