title: Chemoselective 15N tag for sensitive and high-resolution nuclear magnetic resonance profiling of the carboxyl-containing metabolome.
abstract: Metabolic profiling has received increasing recognition as an indispensable complement to genomics and proteomics for probing biological systems and for clinical applications. (1)H nuclear magnetic resonance (NMR) is widely used in the field but is challenged by spectral complexity and overlap. Improved and simple methods that quantitatively profile a large number of metabolites are sought to make further progress. Here, we demonstrate a simple isotope tagging strategy, in which metabolites with carboxyl groups are chemically tagged with (15)N-ethanolamine and detected using a 2D heteronuclear correlation NMR experiment. This method is capable of detecting over 100 metabolites at concentrations as low as a few micromolar in biological samples, both quantitatively and reproducibly. Carboxyl-containing compounds are found in almost all metabolic pathways, and thus this new approach should find a variety of applications.
authors.affiliation: Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, USA.
authors.forename: Tao
authors.initials: T
authors.lastname: Ye
authors.forename: Huaping
authors.initials: H
authors.lastname: Mo
authors.forename: Narasimhamurthy
authors.initials: N
authors.lastname: Shanaiah
authors.forename: G A Nagana
authors.initials: GA
authors.lastname: Gowda
authors.forename: Shucha
authors.initials: S
authors.lastname: Zhang
authors.forename: Daniel
authors.initials: D
authors.lastname: Raftery
mesh_terms: D002264:Carboxylic Acids / Q000032:analysis* / Q000097:blood / Q000652:urine; D019856:Ethanolamine / Q000737:chemistry; D006801:Humans; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D055442:Metabolome; D055432:Metabolomics / Q000379:methods*; D009587:Nitrogen Isotopes
chemical_list: D002264:Carboxylic Acids; D009587:Nitrogen Isotopes; D019856:Ethanolamine