Carbon-13 NMR in Conformational Analysis of Nucleic Acid Fragments. Heteronuclear Chemical Shift Correlation Spectroscopy of RNA Constituents

Overview

Journal Nucleic Acids Res

Publisher Oxford University Press

Specialty Biochemistry

Date 1983 Oct 25

PMID 6195595

Citations 7

Authors

P P Lankhorst

C Erkelens

C A Haasnoot

C Altona

Affiliations

Soon will be listed here.

Abstract

The assignment of the non-quaternary 13C resonances by means of two-dimensional heteronuclear chemical shift correlation spectroscopy is presented for several oligoribonucleotides: The dimers m6(2)AU, m6(2)Am6(2)A and mpUm6(2)A and the trimers m6(2)AUm6(2)A and m4(2)Cm4(2)Cm6(2)A. The temperature and concentration dependency of the 13C chemical shifts are studied with emphasis on the behaviour of the dimer m6(2)AU. The present study shows that in the 5-50 mM range the concentration-dependent chemical shift changes of the ribose carbons are negligible compared to chemical shift changes due to intramolecular events. All compounds studied show a surprising correlation between the chemical shifts of the carbon atoms of the ribose ring and the sugar conformational equilibrium as expressed by the percentage N or S conformer. Thus the chemical shift data can be used to obtain the thermodynamical parameters of the two-state N/S equilibrium. Parameters deduced for m6(2)AU are Tm = 306 K and delta S = -25 cal mol-1 K-1, which values are in satisfactory agreement with results obtained earlier from 1H NMR and from Circular Dichroism.

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Carbon-13 NMR in conformational analysis of nucleic acid fragments. 3. The magnitude of torsional angle epsilon in d(TpA) from CCOP and HCOP NMR coupling constants.

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Carbon-13 NMR in conformational analysis of nucleic acid fragments. 4. The torsion angle distribution about the C3'-O3' bond in DNA constituents.

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PMID: 4000932 PMC: 341043. DOI: 10.1093/nar/13.3.927.

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