Selective diagonal-free 13C,13C-edited aliphatic–aromatic NOESY experiment with non-uniform sampling

Jan Stanek, Michał Nowakowski, Saurabh Saxena, Katarzyna Ruszczyńska-Bartnik, Andrzej Ejchart, Wiktor Koźmiński
2013 Journal of Biomolecular NMR  
A band-selective aromatic-aliphatic C,C-edited four-dimensional NOESY experiment is proposed here. Its key advantage is the absence of auto-correlation signals which makes it very attractive for joint use with non-uniform sampling. It is demonstrated here that the sensitivity of the experiment is not significantly affected by utilization of selective pulses (for either aromatic-13C or aliphatic-13C spins). The method was applied to the sample of E32Q mutant of human S100A1 protein, a homodimer
more » ... f total molecular mass *20 kDa. High-resolution 4D spectra were obtained from *1.5 % of sampling points required conventionally. It is shown that superior resolution facilitates unambiguous assignment of observed aliphatic-aromatic cross-peaks. Additionally, the addition of aliphatic-13C dimension enables to resolve peaks with degenerated aliphatic 1 H chemical shifts. All observed cross-peaks were validated against previously determined 3D structure of E32Q mutant of S100A1 protein (PDB 2LHL). The increased reliability of structural constraints obtained from the proposed high-resolution 4D 13C(ali),13C(aro)-edited NOESY can be exploited in the automated protocols of structure determination of proteins.
doi:10.1007/s10858-013-9739-5 pmid:23657844 pmcid:PMC3699708 fatcat:xnqvqmy7tne5japi42ol2ovoaa