| Title: | "The N-terminus of the yeast G protein-coupled receptor Ste2p plays critical roles in surface expression, signaling, and negative regulation" |
| Author(s): | Uddin MS; Hauser M; Naider F; Becker JM; |
| Address: | "Department of Microbiology, University of Tennessee, Knoxville, TN 37996, United States. Department of Chemistry, and Macromolecular Assemblies Institute, College of Staten Island, CUNY, New York, NY 10314, United States; Graduate School and University Center, CUNY, New York, NY 10314, United States. Department of Microbiology, University of Tennessee, Knoxville, TN 37996, United States. Electronic address: jbecker@utk.edu" |
| DOI: | 10.1016/j.bbamem.2015.12.017 |
| ISSN/ISBN: | 0006-3002 (Print) 0006-3002 (Linking) |
| Abstract: | "G protein-coupled receptors (GPCRs) are found in all eukaryotic cells examined to date where they function as membrane-bound proteins that bind a multitude of extracellular ligands to initiate intracellular signal transduction systems controlling cellular physiology. GPCRs have seven heptahelical membrane spanning domains connected by extracellular and intracellular loops with an extracellular N-terminus and an intracellular C-terminus. The N-terminus has been the least studied domain of most GPCRs. The yeast Ste2p protein, the receptor for the thirteen amino acid peptide pheromone alpha-factor, has been used extensively as a model to study GPCR structure and function. In this study we constructed a number of deletions of the Ste2p N-terminus and uncovered an unexpected function as a negative regulatory domain. We examined the role of the N-terminus in expression, signaling function and ligand-binding properties and found that the residues 11-30 play a critical role in receptor expression on the cell surface. The studies also indicated that residues 2-10 of the N-terminus are involved in negative regulation of signaling as shown by the observation that deletion of these residues enhanced mating and gene induction. Furthermore, our results indicated that the residues 21-30 are essential for optimal signaling. Overall, we propose that the N-terminus of Ste2p plays multiple regulatory roles in controlling receptor function" |
| Keywords: | "Amino Acid Sequence Binding Sites Gene Expression Regulation, Fungal Ligands Mating Factor Peptides/chemistry/metabolism Protein Binding Protein Structure, Tertiary Receptors, G-Protein-Coupled/biosynthesis/*chemistry/metabolism Receptors, Mating Factor/b;" |
| Notes: | "MedlineUddin, M Seraj Hauser, Melinda Naider, Fred Becker, Jeffrey M eng R01 GM022087/GM/NIGMS NIH HHS/ R01 GM112496/GM/NIGMS NIH HHS/ Netherlands 2015/12/29 Biochim Biophys Acta. 2016 Apr; 1858(4):715-24. doi: 10.1016/j.bbamem.2015.12.017. Epub 2015 Dec 17" |
