title: Detection of very weak side chain-main chain hydrogen bonding interactions in medium-size 13C/15N-labeled proteins by sensitivity-enhanced NMR spectroscopy.
abstract: We describe the direct observation of very weak side chain-main chain hydrogen bonding interactions in medium-size 13C/15N-labeled proteins with sensitivity-enhanced NMR spectroscopy. Specifically, the remote correlation. between the hydrogen acceptor side chain carboxylate carbon 13CO2delta of glutamate 54 and the hydrogen donor backbone amide 15N of methionine 49 in a 12 kDa protein, human FKBP12, is detected via the trans-hydrogen bond 3hJ(NCO2delta) coupling by employing a novel sensitivity-enhanced HNCO-type experiment, CPD-HNCO. The 3hJ(NCO2delta) coupling constant appears to be even smaller than the average value of backbone 3hJ(NC') couplings, consistent with more extensive local dynamics in protein side chains.
authors.affiliation: Cellular Biochemistry & Biophysics Program, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA. aizhuo@sbnmr1.ski.mskcc.org
authors.forename: A
authors.initials: A
authors.lastname: Liu
authors.forename: W
authors.initials: W
authors.lastname: Hu
authors.forename: A
authors.initials: A
authors.lastname: Majumdar
authors.forename: M K
authors.initials: MK
authors.lastname: Rosen
authors.forename: D J
authors.initials: DJ
authors.lastname: Patel
mesh_terms: D002247:Carbon Isotopes; D006801:Humans; D006860:Hydrogen Bonding; D009587:Nitrogen Isotopes; D019906:Nuclear Magnetic Resonance, Biomolecular; D022061:Tacrolimus Binding Protein 1A / Q000737:chemistry*
chemical_list: D002247:Carbon Isotopes; D009587:Nitrogen Isotopes; D022061:Tacrolimus Binding Protein 1A