title: Biosynthesis and NMR analysis of a 73-residue domain of a Saccharomyces cerevisiae G protein-coupled receptor.
abstract: The yeast Saccharomyces cerevisiae alpha-factor pheromone receptor (Ste2p) was used as a model G protein-coupled receptor (GPCR). A 73-mer multidomain fragment of Ste2p (residues 267-339) containing the third extracellular loop, the seventh transmembrane domain, and 40 residues of the cytosolic tail (E3-M7-24-T40) was biosynthesized fused to a carrier protein. The multidomain fusion protein (designated M7FP) was purified to near homogeneity as judged by HPLC and characterized by mass spectrometry. In minimal medium, 30-40 mg of M7FP were obtained per liter of culture. The 73-residue peptide was released from its carrier by CNBr and obtained in wild-type, (15)N, and (13)C/(15)N forms. The E3-M7-24-T40 peptide integrated into 1-palmitoyl-2-hydroxy-sn-glycero-3-[phospho-rac-(1-glycerol)] and dodecylphosphocholine micelles at concentrations (200-500 microM) suitable for NMR investigations. HSQC experiments performed in organic solvents and detergent micelles on (15)N-labeled E3-M7-24-T40 showed a clear dispersion of the nitrogen-amide proton correlation cross-peaks indicative of a pure, uniformly labeled molecule that assumed a partially ordered structure. NOE connectivities, chemical shift indices, J-coupling analysis, and structural modeling suggested that in trifluoroethanol/water (1:1) helical subdomains existed in both the transmembrane and cytoslic tail of the multidomain peptide. Similar conclusions were reached in chloroform/methanol/water (4:4:1). As the cytosolic tail participates in down-regulation of Ste2p, the helical regions in the Ste2p tail may play a role in protein-protein interactions involved in endocytosis.
authors.affiliation: Department of Chemistry, College of Staten Island and Macromolecular Assemblies Institute of the City University of New York, Staten Island, New York 10314, USA.
authors.forename: Racha
authors.initials: R
authors.lastname: Estephan
authors.forename: Jacqueline
authors.initials: J
authors.lastname: Englander
authors.forename: Boris
authors.initials: B
authors.lastname: Arshava
authors.forename: Karen L
authors.initials: KL
authors.lastname: Samples
authors.forename: Jeffrey M
authors.initials: JM
authors.lastname: Becker
authors.forename: Fred
authors.initials: F
authors.lastname: Naider
mesh_terms: D000595:Amino Acid Sequence; D002851:Chromatography, High Pressure Liquid; D003488:Cyanogen Bromide; D013058:Mass Spectrometry; D008969:Molecular Sequence Data; D009587:Nitrogen Isotopes; D019906:Nuclear Magnetic Resonance, Biomolecular; D011487:Protein Conformation; D017433:Protein Structure, Secondary; D017434:Protein Structure, Tertiary; D043562:Receptors, G-Protein-Coupled / Q000096:biosynthesis* / Q000737:chemistry*; D051964:Receptors, Mating Factor / Q000096:biosynthesis* / Q000737:chemistry*; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis* / Q000737:chemistry* / Q000302:isolation & purification; D012441:Saccharomyces cerevisiae / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins / Q000096:biosynthesis* / Q000737:chemistry*
chemical_list: C505580:M7FP fusion protein; D009587:Nitrogen Isotopes; D043562:Receptors, G-Protein-Coupled; D051964:Receptors, Mating Factor; D011993:Recombinant Fusion Proteins; C498031:STE2 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D003488:Cyanogen Bromide