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Phosphorus nmr spectra of natural DNA fragments in the course of the B-to-A conformational transition

✍ Scribed by Jaroslav Kypr; Vladimír Sklenář; Michaela Vorlíč-ková

Publisher
Wiley (John Wiley & Sons)
Year
1986
Tongue
English
Weight
549 KB
Volume
25
Category
Article
ISSN
0006-3525

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✦ Synopsis

Synopsis

Changes in the 31 P-nmr spectra of sonicated natural DNA fragments were investigated in ethanol solutions where the fragments underwent, as checked by CD, the B-to-A conformational transition. The study produced the following conclusions: (1) The high DNA concentrations used for the 31 P-nmr measurements promote the transition compared to dilute solutions that are commonly used for CD measurements. (2) The B-to-A transition was reflected in a cooperative downfield shift of the DNA 31P-nmr resonance, consistent with unwinding of the double helix. ( 3 ) Prior to the transition, the changes in chemical shift of double-and single-stranded DNAs were almost identical. It thus appears that the effect of ethanol on the geometry and hydration of phosphodiester linkages does not depend heavily on DNA base-base interactions. (4) The Aform resonances were 30-40% narrower than the B-form resonances, which is attributed to marked sequence-dependent variations in the latter conformation and to their reduction in the former. (5) The B-form DNA aggregated in the concentrated 31P-nmr samples in the presence of ethanol, judged from a milky opalescence of the solution and a substantial broadening of its ."P-nmr resonance. The broadening abruptly disappeared as soon as DNA adopted the A-form so that DNA, in dependence on the secondary structure, showed different tendencies to condense in the presence of ethanol. The condensation increased cooperativity of the B-to-A interconversion.

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