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Components from the extracellular surface of CCR5 interact with certain macrophage-tropic strains of human immunodeficiency virus type 1 (HIV-1) to mediate viral fusion and entry. To mimic these viral interacting site(s), the amino-terminal and extracellular loop segments of CCR5 were linked in tandem to form concatenated polypeptides, or grafted onto a seven-transmembrane bacteriorhodopsin scaffold...
Rhodopsin, a prototypical G protein-coupled receptor, catalyzes the activation of a heterotrimeric G protein, transducin, to initiate a visual signaling cascade in photoreceptor cells. The βγ subunit complex, especially the C-terminal domain of the transducin γ subunit, Gtγ(60-71)farnesyl, plays a pivotal role in allosteric regulation of nucleotide exchange on the transducin α subunit by light-activated...
Understanding the mechanism by which ligands affect receptor conformational equilibria is key in accelerating membrane protein structural biology. In the case of G protein-coupled receptors (GPCRs), we currently pursue a brute-force approach for identifying ligands that stabilize receptors and facilitate crystallogenesis. The nociceptin/orphanin FQ peptide receptor (NOP) is a member of the opioid...
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