title: Conformational analysis of the Saccharomyces cerevisiae tridecapeptide mating pheromone by 13C,15N rotational-echo double resonance nuclear magnetic resonance spectroscopy.
abstract: The solid-state conformation of [Nle12]alpha-factor, the Saccharomyces cerevisiae tridecapeptide mating pheromone (WHWLQLKPGQPNleY), was investigated by 13C,15N rotational-echo double resonance (REDOR) nuclear magnetic resonance spectroscopy (NMR). Previous high-resolution NMR studies of [Nle12]alpha-factor in solution revealed a transient Type II beta-turn spanning residues 7-10 of the peptide. To investigate this region of [Nle12]alpha-factor in the solid state, a series of four selectively 13C,15N-enriched tridecapeptides were synthesized by solid-phase methods. Carbon-nitrogen distances between the labeled sites in lyophilized samples of [Nle12]alpha-factor were accurately measured by REDOR NMR. Experimentally determined distances were compared with those from calculated models for Type I and Type II beta-turns and for an extended chain. The measured distances indicate that, in a lyophilized powder, the central region of the [Nle12]alpha-factor is not in an extended conformation. The experimental data was most consistent with distances obtained from a distorted Type I beta-turn model.
authors.affiliation: Monsanto Corporate Research, Monsanto Company, St. Louis, Missouri 63198.
authors.forename: J R
authors.initials: JR
authors.lastname: Garbow
authors.forename: M
authors.initials: M
authors.lastname: Breslav
authors.forename: O
authors.initials: O
authors.lastname: Antohi
authors.forename: F
authors.initials: F
authors.lastname: Naider
mesh_terms: D000595:Amino Acid Sequence; D009682:Magnetic Resonance Spectroscopy; D000072235:Mating Factor; D008969:Molecular Sequence Data; D010455:Peptides / Q000737:chemistry*; D011487:Protein Conformation; D017433:Protein Structure, Secondary; D012441:Saccharomyces cerevisiae / Q000737:chemistry*
chemical_list: D010455:Peptides; D000072235:Mating Factor