title: Generation and relaxation of high rank coherences in AX3 systems in a selectively methionine labelled SH2 domain.
abstract: The usefulness of selective isotope labelling patterns is demonstrated using the C-terminal SH2 domain of PLC-gamma1 selectively 13C labelled at methionine methyl groups. We demonstrate the generation and relaxation of coherences that are second rank in protons and first rank in carbons that derive from quadrupolar order in protons. The decay rates of second rank double quantum proton coherences are measured. These terms exhibit fewer channels for cross-correlated relaxation compared to single quantum coherences. Our results indicate the potential application of the measurement of high order proton coherences to the analysis of dynamics in methyl-bearing side chains.
authors.affiliation: Department of Biomolecular Structural Chemistry, Max F. Perutz Laboratories, University of Vienna, Campus Vienna Biocenter 5, Vienna, 1030, Austria. karin.kloiber@univie.ac.at
authors.forename: Karin
authors.initials: K
authors.lastname: Kloiber
authors.forename: Michael
authors.initials: M
authors.lastname: Fischer
authors.forename: Karin
authors.initials: K
authors.lastname: Ledolter
authors.forename: Michael
authors.initials: M
authors.lastname: Nagl
authors.forename: Walther
authors.initials: W
authors.lastname: Schmid
authors.forename: Robert
authors.initials: R
authors.lastname: Konrat
mesh_terms: D007553:Isotope Labeling; D008280:Magnetics; D008715:Methionine / Q000737:chemistry*; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods*; D051966:Phospholipase C gamma / Q000737:chemistry*; D013816:Thermodynamics; D018909:src Homology Domains
chemical_list: D008715:Methionine; D051966:Phospholipase C gamma