P2Y purinoreceptor 1
The orthosteric binding pocket accommodates ADP and nucleotide analogs, characterized by conserved arginine and aspartate residues for nucleotide recognition typical of purinergic receptors. Structural data (PDB: 4XNV, 4XNW) reveal both agonist and antagonist binding modes, with allosteric modulation sites potentially accessible for selective ligand design.
P2Y1 selectivity faces challenges due to structural homology with other adenine nucleotide-binding P2Y receptors (P2Y12, P2Y13), requiring ligand optimization to minimize off-target platelet effects while achieving CNS penetration for neuroprotection. Selectivity advantages exist through orthosteric pocket residue differences compared to P2Y12, enabling isoform-selective antagonists.
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