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Liu, Wei; Chun, Eugene; Thompson, Aaron A.; Chubukov, Pavel; Xu, Fei; Katritch, Vsevolod; Han, Gye Won; Roth, Christopher B.; Heitman, Laura H.; IJzerman, Adriaan P.; Cherezov, Vadim; Stevens, Raymond C.
Science (American Association for the Advancement of Science), 07/2012, Letnik: 337, Številka: 6091Journal Article
Pharmacological responses of G protein-coupled receptors (GPCRs) can be fine-tuned by allosteric modulators. Structural studies of such effects have been limited due to the medium resolution of GPCR structures. We reengineered the human A 2A adenosine receptor by replacing its third intracellular loop with apocytochrome b⁵⁶² RIL and solved the structure at 1.8 angstrom resolution. The high-resolution structure allowed us to identify 57 ordered water molecules inside the receptor comprising three major clusters. The central cluster harbors a putative sodium ion bound to the highly conserved aspartate residue Asp 2.50 . Additionally, two cholesterols stabilize the conformation of helix VI, and one of 23 ordered lipids intercalates inside the ligand-binding pocket. These high-resolution details shed light on the potential role of structured water molecules, sodium ions, and lipids/cholesterol in GPCR stabilization and function.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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