Abstract
NMR dipole-dipole couplings between protein backbone nuclei (1H(alpha), 13C(alpha), 15N, 1H(N), 13C') offer enormous scope for the rapid determination of protein global folds. Here, we show that measurement of one-bond splittings in the protein backbone is facilitated by use of protein that is selectively isotopically enriched only in the backbone atoms. In particular, 1H(alpha)-13C(alpha) couplings can be measured simply and with high sensitivity by use of conventional heteronuclear single quantum correlation (HSQC) techniques.
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