Abstract
A nuclear magnetic resonance (NMR) experiment is described for the direct detection of N-H⋯O=C hydrogen bonds (H-bonds) in 15N and 13C isotope-labeled biomolecules. This quantitative 'long-range' HNCO-COSY (correlation spectroscopy) experiment detects and quantifies electron-mediated scalar couplings across the H-bond (H-bond scalar couplings), which connect the magnetically active 15N and 13C nuclei on both sides of the H-bond. Detectable H-bonds comprise the canonical backbone H-bonds in proteins as well as other H-bonds in proteins and nucleic acids with N–H donors and O=C (carbonylic or carboxylic) acceptors. Unlike other NMR observables, which provide only indirect evidence of the presence of H-bonds, the H-bond scalar couplings identify all partners of the H-bond, the donor, the donor proton and the acceptor, in a single experiment. The size of the scalar couplings can be related to H-bond geometries. The time required to detect the N−H⋯O=C H-bonds in small proteins (≤≈10 kDa) is typically on the order of 1 d at millimolar concentrations, whereas H-bond detection for larger proteins (≤≈30 kDa) may be possible within several days depending on concentration, isotope composition, magnetic field strength and molecular weight. The proteins ubiquitin (8.6 kDa), dimeric RANTES (2 × 8.5 kDa) and MAP30 (30 kDa) are used as examples to illustrate this procedure.
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Acknowledgements
We gratefully acknowledge our collaborators Professor Barfield, Professor Feigon and Dr. Bax for their continued support and enthusiasm. This work was supported by SNF grant 31-109712 (S.G.) and by a stipend of the Boehringer Ingelheim Fonds (L.N.).
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Supplementary Box 1
Bruker 2D long-range-H(N)CO-TROSY pulse sequence code (DOC 87 kb)
Supplementary Box 2
Conversion and NMRPipe processing script for 2D long-range H(N)CO data recorded on a Bruker NMR spectrometer (DOC 29 kb)
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Cordier, F., Nisius, L., Dingley, A. et al. Direct detection of N−H⋯O=C hydrogen bonds in biomolecules by NMR spectroscopy. Nat Protoc 3, 235–241 (2008). https://doi.org/10.1038/nprot.2007.498
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DOI: https://doi.org/10.1038/nprot.2007.498
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