Cells require the ability to detect and respond to stimuli in their surroundings, including to endogenous metabolites, exogenous nutrients, and environmental irritants. The proteins that are responsible for this process are called chemosensors and are involved in regulating diverse biological processes involved in pain sensation, dietary preference, and metabolic control. Because chemosensors transmit external environmental information into the cell, nearly all chemosensors are structurally-complex membrane proteins that span the cell's plasma membrane multiple times, such as ion channels, transporters, and G protein-coupled receptors. However, because most chemosensors are difficult to express, purify, and solubilize, structural and functional information about them has been exceptionally difficult to obtain. The goal of this Phase 2 proposal is to engineer chemosensors with increased surface expression and increased stability in solution and to map ligand and drug binding sites on these chemosensors.
This project will contribute to human health by providing tools that will enable new small molecules and therapeutic MAbs to be developed against specific chemosensor targets. These targets are involved in the transmission of pain, cancer, and metabolic disorders, yet there are currently no FDA-approved drugs against any of our target protein families. The lack of therapeutic drugs and antibodies against these targets, and most chemosensors in general, reflects their conformational complexity and the lack of tools that have been able to manipulate and engineer these proteins for commercial purposes.
|Thomas, Anu; Sulli, Chidananda; Davidson, Edgar et al. (2017) The Bitter Taste Receptor TAS2R16 Achieves High Specificity and Accommodates Diverse Glycoside Ligands by using a Two-faced Binding Pocket. Sci Rep 7:7753|
|Chen, Derek E; Willick, Darryl L; Ruckel, Joseph B et al. (2015) Principal component analysis of binding energies for single-point mutants of hT2R16 bound to an agonist correlate with experimental mutant cell response. J Comput Biol 22:37-53|
|Campbell, Michael C; Ranciaro, Alessia; Zinshteyn, Daniel et al. (2014) Origin and differential selection of allelic variation at TAS2R16 associated with salicin bitter taste sensitivity in Africa. Mol Biol Evol 31:288-302|
|Greene, Tiffani A; Alarcon, Suzanne; Thomas, Anu et al. (2011) Probenecid inhibits the human bitter taste receptor TAS2R16 and suppresses bitter perception of salicin. PLoS One 6:e20123|