NMR Studies of the Solution Conformation and Dynamics of the Tyrocidine Peptide Antibiotics

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University of Wisconsin--Madison, 1985 - 552 pagine
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Indice

Introduction 2
2
Comparison of the conformation of tyrocidine B and C
27
Experimental
30

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2D NOE 2D NOE experiment aliphatic alpha carbon alpha protons amide proton amino acid ammonium acetate anisotropic antibacterial antibiotics antiparallel aromatic aromatic ring Asn side chain assignments Bacillus brevis backbone structure beta carbon beta protons Biochem Biochemistry Biopolymers broad peaks carbon NT carbonyl carboxamide carboxylic acid Chem CHOLINE circular dichroism CN CN CO CO CO H conformation contour plot correlation experiment coupling constants cross peaks Danders data matrix decoupling detected dihedral angles DMSO DMSO-d downfield DPhe DTrp dynorphin enkephalin et al exchange rates experimental Figure Fourier transform free radical Gibbons gram-negative gramicidin HPLC hydrogen bond Hz/point interac interaction intramolecular isotropic J-resolved Kuo and Gibbons magnetic field Mascagni methanol methyl moieties molecular molecular dynamic molecule motions natural abundance Niccolai Nicolet nitroxide NMR spectroscopy NMR study NOE experiment NOE values Nuclear Magnetic Resonance Nuclear Overhauser Effect opioid peptide paramagnetic peptide bond proline proton chemical shifts proton NMR pyrrolidine quaternary carbon random coil peptide region relaxation rates residues resonance ring current ring protons rotamer rotamer populations rotation secondary structure side chain carbon solution solvent solvent exposure Somorjai spectra spectrometer spectroscopy spectrum spin Spin Labels spin-lattice relaxation sporulation temperature temperature coefficients TEMPO tion transannular tyro tyroci tyrocidine tyrothricin University of Wisconsin-Madison upfield Val1 WddV Wuthrich

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