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For use in site‐specific bioorthogonal labeling of expressed G protein‐coupled receptors (GPCRs) in live cells, we developed a luciferase‐based reporter assay. The assay was used to compare amber codon suppression efficiency, receptor functionality, and efficiency of different bioorthogonal labeling chemistries. We used the assay system to compare side‐by‐side the efficiency of incorporation of three...
The cholecystokinin receptor type 1 (CCK1R) is a G protein-coupled receptor (GPCR) that is involved in several biological processes including the regulation of the secretion of digestive enzymes. The peptide hormone cholecystokinin (CCK) binds to CCK1R, which is an important pharmacological target for several diseases, including obesity. Interestingly, nutritional dietary peptides also appear to activate...
Heptahelical G protein-coupled receptors (GPCRs) are located in the cell’s plasma membrane and are responsible for transmitting chemical signals across the lipid bilayer. GPCRs comprise a large family of related receptors that have evolved to bind a wide range of extracellular ligands, from biogenic amines and neuromodulatory peptides to peptide hormones and proteins, and to lipids and fatty acids,...
Tyrosine sulfation of the chemokine receptor CXCR4 enhances its interaction with the chemokine SDF-1α. Given similar post-translational modification of other receptors, including CCR5, CX3CR1 and CCR2b, tyrosine sulfation may be of universal importance in chemokine signaling. N-terminal domains from seven transmembrane chemokine receptors have been employed for structural studies of chemokine–receptor...
The CC-chemokine receptor 5 (CCR5) is the major coreceptor for macrophage-tropic (R5) HIV-1 strains. Several small molecule inhibitors of CCR5 that block chemokine binding and HIV-1 entry are being evaluated as drug candidates. Here we define how CCR5 antagonists TAK-779, AD101 (SCH-350581) and SCH-C (SCH-351125), which inhibit HIV-1 entry, interact with CCR5. Using a mutagenesis approach in combination...
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