13C-detected NMR experiments for measuring chemical shifts and coupling constants in nucleic acid bases.
The paper presents a set of two-dimensional experiments that utilize direct (13)C detection to provide proton-carbon, carbon-carbon and carbon-nitrogen correlations in the bases of nucleic acids. The set includes a (13)C-detected proton-carbon correlation experiment for the measurement of (13)C-(13)C couplings, the CaCb experiment for correlating two quaternary carbons, the HCaCb experiment for the (13)C-(13)C correlations in cases where one of the carbons has a proton attached, the HCC-TOCSY experiment for correlating a proton with a network of coupled carbons, and a (13)C-detected (13)C-(15)N correlation experiment for detecting the nitrogen nuclei that cannot be detected via protons. The IPAP procedure is used for extracting the carbon-carbon couplings and/or carbon decoupling in the direct dimension, while the S(3)E procedure is preferred in the indirect dimension of the carbon-nitrogen experiment to obtain the value of the coupling constant. The experiments supply accurate values of (13)C and (15)N chemical shifts and carbon-carbon and carbon-nitrogen coupling constants. These values can help to reveal structural features of nucleic acids either directly or via induced changes when the sample is dissolved in oriented media.
Fiala
Radovan
R
National Centre for Biomolecular Research, Masaryk University, Kotlárská 2, Brno 611 37, Czech Republic. fiala@ncbr.chemi.muni.cz
Sklenár
Vladimír
V
D002247:Carbon Isotopes; D009587:Nitrogen Isotopes; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods*; D009696:Nucleic Acids / Q000737:chemistry*; D011522:Protons; D011687:Purines / Q000737:chemistry*; D011743:Pyrimidines / Q000737:chemistry*
D002247:Carbon Isotopes; D009587:Nitrogen Isotopes; D009696:Nucleic Acids; D011522:Protons; D011687:Purines; D011743:Pyrimidines
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