Phosphorus-31 transverse relaxation rate measurements by NMR spectroscopy: insight into conformational exchange along the nucleic acid backbone.
Phosphorus ((31)P) NMR spectroscopy can provide important information about the dynamics of nucleic acids. In this communication, we propose an inversely detected (31)P transverse relaxation rate ( R (2)) measurement experiment. This experiment enables fast measurement of accurate (31)P transverse relaxation rates and provides the possibility to detect slow motions mapped by the phosphorus nuclei along the nucleic acid backbone. Dispersion curves show some (31)P nuclei experiencing chemical exchange in the millisecond time scale. Under the assumption of a two-state exchange process, the reduced lifetimes of the exchanging sites (tau(ex)) obtained are in accordance with base pair lifetime estimates deduced from imino proton exchange measurements.
Catoire
Laurent J
LJ
Laboratoire de Biotechnologie et de Pharmacogénétique Appliquée, CNRS UMR 8113, Institut Gustave Roussy, 39 rue Camille Desmoulins, 94805 Villejuif, France. catoire@ibpe.fr
D004247:DNA / Q000737:chemistry*; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods*; D009690:Nucleic Acid Conformation; D010759:Phosphorus Isotopes
D010759:Phosphorus Isotopes; D004247:DNA