title: Selective 1H- 13C NMR spectroscopy of methyl groups in residually protonated samples of large proteins.
abstract: Methyl (13)CHD(2) isotopomers of all methyl-containing amino-acids can be observed in residually protonated samples of large proteins obtained from [U-(13)C,(1)H]-glucose/D(2)O-based bacterial media, with sensitivity sufficient for a number of NMR applications. Selective detection of some subsets of methyl groups (Ala(beta), Thr(gamma 2)) is possible using simple 'out-and-back' NMR methodology. Such selective methyl-detected 'out-and-back' NMR experiments allow complete assignments of threonine gamma 2 methyls in residually protonated, [U-(13)C,(1)H]-glucose/D(2)O-derived samples of an 82-kDa enzyme Malate Synthase G. [U-(13)C,(1)H]-glucose/D(2)O-derived protein samples are relatively inexpensive and are usually available at very early stages of any NMR study of high-molecular-weight systems.
authors: Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA.
authors: Chenyun
authors: C
authors: Guo
authors: Vitali
authors: V
authors: Tugarinov
mesh_terms: D008292:Malate Synthase / Q000737:chemistry*; D008745:Methylation; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods*; D011522:Protons
chemical_list: D011522:Protons; D008292:Malate Synthase