31P magnetic relaxation in polynucleotides.
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概要
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Phosphorus-31 nuclear spin-lattice relaxation times and nuclear Overhauser enhancement upon nonselective proton saturation were measured on polyriboadenylic acid, polyribocytidylic acid, and polyribouridylic acid. A method is described to separate dipolar contribution from the contribution of chemical shift anisotropy for the phosphorus relaxation by the combined use of <I>T</I><SUB>1</SUB> and NOE data. Chemical shift anisotropies (δ<SUB>⁄⁄</SUB>−δ<SUB>⊥</SUB>) of phosphorus in these polynucleotides in solution are estimated to be in the range 120–165 ppm. The molecular motion of the phosphorus moiety becomes faster in the order, poly(A)<poly(C)<poly(U), the thermal activation processes being characterized by single activation energies, <I>i.e.</I>, 5.1, 5.3–6.0, and 7.2–8.1 kcal/mol for poly(U), poly(C), and poly(A), respectively.
- 公益社団法人 日本化学会の論文
著者
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Yamada Atsuko
Department Of Chemistry Faculty Of Science Gakushuin University
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Akasaka Kazuyuki
Department Of Biotechnological Science School Of Biology-oriented Science And Technology Kinki Unive
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Hatano Hiroyuki
Department of Chemistry, Faculty of Science, Kyoto University
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Akasaka Kazuyuki
Department of Chemistry, Faculty of Science, Kyoto University
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