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• W2128791330 abstract "Angiotensin II receptor subtypes AT1 and AT2 are proteins with seven transmembrane domain (TMD) topology and share 34% homology. It was shown that His256, located in the sixth TMD of the AT1 receptor, is needed for the agonist activation by the Phe8 side chain of angiotensin II, although replacing this residue with arginine or glutamine did not significantly alter the affinity binding of the receptor. We hypothesized that the His273 located in the sixth transmembrane domain of the AT2 receptor may play a similar role in the functions of the AT2 receptor, although this residue was not identified as a conserved residue in the initial homology comparisions. Therefore, we replaced His273 of the AT2 receptor with arginine or glutamine and analyzed the ligand-binding properties of the mutant receptors using Xenopus oocytes as an expression system. Our results suggested that the AT2 receptor mutants His273Arg and His273 Glu have lost their affinity to [125I-Sar1-Ile8]Ang II, a peptidic ligand that binds both the AT1 and AT2 receptors and to 125I-CGP42112A, a peptidic ligand that binds specifically to the AT2 receptor. Thus, His273 located in the sixth TMD of the AT2 receptor seems to play an important role in determining the binding properties of this receptor. Moreover, these results along with our previous observation that the Lys215 located in the 5th TMD of the AT2 receptor is essential for its high affinity binding to [125I-Sar1-Ile8]Ang II indicate that key amino acids located in the 5th and 6th TMDs of the AT2 receptor are needed for high affinity binding of the AT2 to its ligands." @default.
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• W2128791330 creator A5013430996 @default.
• W2128791330 creator A5081724961 @default.
• W2128791330 creator A5090175383 @default.
• W2128791330 date "1999-04-01" @default.
• W2128791330 modified "2023-09-26" @default.
• W2128791330 title "Role of the His273 Located in the Sixth Transmembrane Domain of the Angiotensin II Receptor Subtype AT2 in Ligand–Receptor Interaction" @default.
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• W2128791330 doi "https://doi.org/10.1006/bbrc.1999.0207" @default.
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