9uwi

Cryo-EM structure of human V1aR bound with atosiban at a resolution of 2.8 angstrom

spinqualitylabelsall models 9uwi, resolution 2.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9uwi is a 4 chain structure with sequence from Homo sapiens and Synthetic construct. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 2.8Å Ligands: A1EQM, CLR, MPT, NH2, ORN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function V1AR_HUMAN Receptor for arginine vasopressin. The activity of this receptor is mediated by G proteins which activate a phosphatidyl-inositol-calcium second messenger system. Has been involved in social behaviors, including affiliation and attachment. Publication Abstract from PubMed Arginine vasopressin (AVP) and oxytocin (OT) are peptide hormones critical for various physiological processes. Vasopressin receptor 1 A (V1aR), a primary AVP target, is promising for central nervous system (CNS) disorders therapies, yet the mechanisms of antagonism and oligomerization remain poorly understood. Here, we present structures of human V1aR in its apo state and in complexes with antagonists: atosiban, balovaptan, and SRX246. Structural analyses reveal a dimeric V1aR assembly, validated by functional assays and imaging in cells. The apo structure shows a flat extracellular loop 2 (ECL2) with unpaired cysteines, undergoing significant conformational changes upon ligand binding. Antagonist-bound structures, combined with mutagenesis and radioligand binding assays, uncover distinct binding modes and key determinants for antagonism and selectivity. These findings provide a comprehensive understanding of V1aR assembly and dynamic regulation, offering valuable insights for structure-guided development of new antagonists targeting dimeric V1aR for CNS disorders. Molecular basis of antagonism of the dimeric human arginine vasopressin receptor 1A.,Zhong P, Chu B, Yu Z, Qiao Y, Ding Y, Zhang Y, Wu X Nat Commun. 2026 Jan 16. doi: 10.1038/s41467-026-68331-5. PMID:41545407 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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