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Proton assisted recoupling and protein structure determination
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De Paëpe, Gaël, Lewandowski, Józef R., Loquet, Antoine, Böckmann, Anja and Griffin, Robert G. (2008) Proton assisted recoupling and protein structure determination. The Journal of Chemical Physics, Vol.129 (No.24). p. 245101. doi:10.1063/1.3036928 ISSN 0021-9606.
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Official URL: http://dx.doi.org/10.1063/1.3036928
Abstract
We introduce a homonuclear version of third spin assisted recoupling, a second-order mechanism that can be used for polarization transfer between (13)C or (15)N spins in magic angle spinning (MAS) NMR experiments, particularly at high spinning frequencies employed in contemporary high field MAS experiments. The resulting sequence, which we refer to as proton assisted recoupling (PAR), relies on a cross-term between (1)H-(13)C (or (1)H-(15)N) couplings to mediate zero quantum (13)C-(13)C (or (15)N-(15)N recoupling). In particular, using average Hamiltonian theory we derive an effective Hamiltonian for PAR and show that the transfer is mediated by trilinear terms of the form C(1)(+/-)C(2)(-/+)H(Z) for (13)C-(13)C recoupling experiments (or N(1)(+/-)N(2)(-/+)H(Z) for (15)N-(15)N). We use analytical and numerical simulations to explain the structure of the PAR optimization maps and to delineate the PAR matching conditions. We also detail the PAR polarization transfer dependence with respect to the local molecular geometry and explain the observed reduction in dipolar truncation. Finally, we demonstrate the utility of PAR in structural studies of proteins with (13)C-(13)C spectra of uniformly (13)C, (15)N labeled microcrystalline Crh, a 85 amino acid model protein that forms a domain swapped dimer (MW=2x10.4 kDa). The spectra, which were acquired at high MAS frequencies (omega(r)2 pi>20 kHz) and magnetic fields (750-900 MHz (1)H frequencies) using moderate rf fields, exhibit numerous cross peaks corresponding to long (up to 6-7 A) (13)C-(13)C distances which are particularly useful in protein structure determination. Using results from PAR spectra we calculate the structure of the Crh protein.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
| Library of Congress Subject Headings (LCSH): | Proteins -- Structure, Proteins -- Analysis, Nuclear magnetic resonance spectroscopy, Solid state chemistry, Molecular biology, Protons, Nuclear spin | ||||
| Journal or Publication Title: | The Journal of Chemical Physics | ||||
| Publisher: | American Institute of Physics | ||||
| ISSN: | 0021-9606 | ||||
| Official Date: | 28 December 2008 | ||||
| Dates: |
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| Volume: | Vol.129 | ||||
| Number: | No.24 | ||||
| Page Range: | p. 245101 | ||||
| DOI: | 10.1063/1.3036928 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | National Institutes of Health (U.S.) (NIH), France. Agence nationale de la recherche (ANR) | ||||
| Grant number: | EB-001960 (NIH), EB-003151 (BIH), EB-002026 (NIH), JC05_44957 (ANR) |
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