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Structural basis for Na(+)-sensitivity in dopamine D2 and D3 receptors.

To understand the structural basis for the Na(+)-sensitivity of ligand binding to dopamine D2-like receptors, using computational analysis in combination with binding assays, we identified interactions critical in propagating the impact of Na(+) on receptor conformations and on the ligand-binding site. Our findings expand the pharmacologically-relevant conformational spectrum of these receptors.