title: CACA-TOCSY with alternate 13C-12C labeling: a 13Calpha direct detection experiment for mainchain resonance assignment, dihedral angle information, and amino acid type identification.
abstract: We present a (13)C direct detection CACA-TOCSY experiment for samples with alternate (13)C-(12)C labeling. It provides inter-residue correlations between (13)C(alpha) resonances of residue i and adjacent C(alpha)s at positions i - 1 and i + 1. Furthermore, longer mixing times yield correlations to C(alpha) nuclei separated by more than one residue. The experiment also provides C(alpha)-to-sidechain correlations, some amino acid type identifications and estimates for psi dihedral angles. The power of the experiment derives from the alternate (13)C-(12)C labeling with [1,3-(13)C] glycerol or [2-(13)C] glycerol, which allows utilizing the small scalar (3)J(CC) couplings that are masked by strong (1)J(CC) couplings in uniformly (13)C labeled samples.
authors.affiliation: Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 240 Longwood Avenue, Boston, MA 02115, USA.
authors.forename: Koh
authors.initials: K
authors.lastname: Takeuchi
authors.forename: Dominique P
authors.initials: DP
authors.lastname: Frueh
authors.forename: Zhen-Yu J
authors.initials: ZY
authors.lastname: Sun
authors.forename: Sebastian
authors.initials: S
authors.lastname: Hiller
authors.forename: Gerhard
authors.initials: G
authors.lastname: Wagner
mesh_terms: D000596:Amino Acids / Q000737:chemistry*; D002247:Carbon Isotopes / Q000737:chemistry* / Q000378:metabolism; D003903:Deuterium / Q000737:chemistry / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D005990:Glycerol / Q000378:metabolism; D009419:Nerve Tissue Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods*; D011487:Protein Conformation; D021122:Protein Subunits; D011993:Recombinant Fusion Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism
chemical_list: D000596:Amino Acids; D002247:Carbon Isotopes; C029152:G-substrate; D009419:Nerve Tissue Proteins; D021122:Protein Subunits; D011993:Recombinant Fusion Proteins; D003903:Deuterium; D005990:Glycerol
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