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

Author
Abstract
:

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 of 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.

Year of Publication
:
2013
Journal
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Journal of biomolecular NMR
Volume
:
56
Issue
:
3
Number of Pages
:
217-26
ISSN Number
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0925-2738
URL
:
https://doi.org/10.1007/s10858-013-9739-5
DOI
:
10.1007/s10858-013-9739-5
Short Title
:
J Biomol NMR
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