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https://www.selleckchem.com/products/gbd-9.html Heat shock protein 90 (Hsp90) is a molecular chaperone that is responsible for the folding and maturation of client proteins that are associated with all ten hallmarks of cancer. Hsp90 N-terminal pan inhibitors have experienced unfavorable results in clinical trials due to induction of the heat shock response (HSR), among other concerns. Novobiocin, a well characterized DNA gyrase B inhibitor, was identified as the first Hsp90 C-terminal inhibitor that manifested anticancer effects without induction of the HSR. In this letter, a library of Hsp90 C-terminal inhibitors derived from a benzothiazole-based scaffold, known to inhibit DNA gyrase B, was designed, synthesized, and evaluated. Several compounds were found to manifest low micromolar activity against both MCF-7 and SKBr3 breast cancer cell lines via Hsp90 C-terminal inhibition.G protein-coupled receptors (GPCRs) have always been important drug targets in the pharmaceutical industry. One major question for the current GPCR drug discovery is how drugs have distinct efficacies at the same GPCR target. Related to this question, we studied how different ligands can have disparate efficacies at Leukotriene B4 receptor (BLT2). By using molecular modeling studies, we predicted that Tyr2716.51 located at TM6 of BLT2 performs as a key trigger for its activation and verified the prediction by site-directed mutagenesis, chemotactic motility studies, which included a chemical derivative of agonist CAY10583. We further identified Asn2756.55 located at TM6 as a weak activation trigger in BLT2 and performed double mutation studies to confirm our computational results. Our results provide strong evidence for the exact mechanism of ligand efficacy at BLT2.Fluorescence labeled ligands have been gaining importance as molecular tools, enabling receptor-ligand-binding studies by various fluorescence-based techniques. Aiming at red-emitting fluorescent ligands for the hH2R, a series of s

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