title: Proton assisted recoupling at high spinning frequencies.
abstract: We demonstrate the successful application of (13)C-(13)C proton assisted recoupling (PAR) on [U-(13)C,(15)N] N-f-MLF-OH and [U-(13)C,(15)N] protein GB1 at high magic angle spinning (MAS) frequencies (omega(r)/2pi = 65 kHz). Specifically, by combining PAR mixing with low power heteronuclear decoupling (omega(1H)/2pi approximately 16 kHz) and high spinning frequencies, we obtain high resolution 2D spectra displaying long-range (13)C-(13)C contacts from which distance estimates can be extracted. These experiments therefore demonstrate the possibility of performing high resolution structural studies in the limit of high spinning frequency and low power (1)H decoupling, a regime which optimizes the resolution of protein samples and preserves their integrity.
authors.affiliation: Department of Chemistry and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Józef R
authors.initials: JR
authors.lastname: Lewandowski
authors.forename: Gaël
authors.initials: G
authors.lastname: De Paëpe
authors.forename: Matthew T
authors.initials: MT
authors.lastname: Eddy
authors.forename: Jochem
authors.initials: J
authors.lastname: Struppe
authors.forename: Werner
authors.initials: W
authors.lastname: Maas
authors.forename: Robert G
authors.initials: RG
authors.lastname: Griffin
mesh_terms: D002247:Carbon Isotopes; D003198:Computer Simulation; D003460:Crystallization; D008958:Models, Molecular; D050505:Mutant Proteins / Q000032:analysis / Q000737:chemistry; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods*; D011487:Protein Conformation; D011506:Proteins / Q000032:analysis* / Q000737:chemistry / Q000235:genetics; D011522:Protons
chemical_list: D002247:Carbon Isotopes; D050505:Mutant Proteins; D011506:Proteins; D011522:Protons