Heteronuclear relayed E.COSY applied to the determination of accurate 3J(HN,C′) and 3J(Hβ,C′) coupling constants in Desulfovibrio vulgaris flavodoxin
Journal of Biomolecular NMR - 1996
Tóm tắt
A simple constant-time 3D heteronuclear NMR pulse sequence has been developed to quantitatively determine the heteronuclear three-bond couplings 3J(HN,C′) and 3J(Hβ,C′) in uniformly 13C-enriched proteins. The protocols for measuring accurate coupling constants are based on 1H,13C-heteronuclear relayed E.COSY [Schmidt, J.M., Ernst, R.R., Aimoto, S. and Kainosho, M. (1995) J. Biomol. NMR, 6, 95–105] in combination with numerical least-squares spectrum evaluation. Accurate coupling constants are extracted from 2D spectrum projections using 2D multiplet simulation. Confidence intervals for the obtained three-bond coupling constants are calculated from F-statistics. The three-bond couplings are relevant to the determination of ϕ and X
1 dihedral-angle conformations in the amino acid backbone and side chain. The methods are demonstrated on the recombinant 13C, 15N-doubly enriched 147-amino acid protein Desulfovibrio vulgaris flavodoxin with bound flavin mononucleotide in its oxidized form. In total, 109 3J(HN,C′) and 100 3J(Hβ,C′) coupling constants are obtained from a single spectrum.
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