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Dopamine receptor D1
Dopamine receptor D1, also known as DRD1, is one of the two types of D1-like receptor family—receptors D1 and D5. It is a protein that in humans is encoded by the DRD1 gene.
D1 receptors are the most abundant kind of dopamine receptor in the central nervous system.
Northern blot and in situ hybridization show that the mRNA expression of DRD1 is highest in the dorsal striatum (caudate and putamen) and ventral striatum (nucleus accumbens and olfactory tubercle).
Lower levels occur in the basolateral amygdala, cerebral cortex, septum, thalamus, and hypothalamus.
The DRD1 gene expresses primarily in the caudate putamen in humans, and in the caudate putamen, the nucleus accumbens and the olfactory tubercle in mouse.
The dopamine receptor D1 (D1R) is a Gs-coupled GPCR characterized by a canonical seven-transmembrane (TM) helical domain, with a ligand-binding pocket located extracellularly and a cytoplasmic G-protein interaction interface. Cryo-EM and X-ray crystallography studies reveal that agonist binding induces conformational changes, including outward movement of TM6 and extension of TM5 by two helical turns, facilitating engagement with the Gαs subunit.
Agonist interact with extracellular loop 2 and extracellular regions of trans-membrane helices 2, 3, 6, and 7. Interactions between catechol-based agonists and three trans-membrane serine residues including S1985.42, S1995.43, and S2025.46 function as microswitches that are essential for receptor activation.
The ligand-binding pocket accommodates both catechol (e.g., dopamine, SKF81297) and non-catechol agonists, with selectivity influenced by residues like V3177.39 and W3217.43 in TM7, which form hydrophobic interactions rather than the polar contacts seen in β2-adrenergic receptors. Non-catechol agonists bind in an extended conformation, spanning the orthosteric site to extracellular loop 2 (ECL2), leveraging unique pocket topology for D1R specificity. Structural comparisons with D2R highlight divergent cytoplasmic features—D1R's elongated TM5 and larger Gs interface (~1,520 Å2) contrast with D2R's Gi-selective coupling, underpinning functional specificity. These insights provide templates for designing selective therapeutics targeting dopaminergic pathways.
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Dopamine receptor D1 AI simulator
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Dopamine receptor D1
Dopamine receptor D1, also known as DRD1, is one of the two types of D1-like receptor family—receptors D1 and D5. It is a protein that in humans is encoded by the DRD1 gene.
D1 receptors are the most abundant kind of dopamine receptor in the central nervous system.
Northern blot and in situ hybridization show that the mRNA expression of DRD1 is highest in the dorsal striatum (caudate and putamen) and ventral striatum (nucleus accumbens and olfactory tubercle).
Lower levels occur in the basolateral amygdala, cerebral cortex, septum, thalamus, and hypothalamus.
The DRD1 gene expresses primarily in the caudate putamen in humans, and in the caudate putamen, the nucleus accumbens and the olfactory tubercle in mouse.
The dopamine receptor D1 (D1R) is a Gs-coupled GPCR characterized by a canonical seven-transmembrane (TM) helical domain, with a ligand-binding pocket located extracellularly and a cytoplasmic G-protein interaction interface. Cryo-EM and X-ray crystallography studies reveal that agonist binding induces conformational changes, including outward movement of TM6 and extension of TM5 by two helical turns, facilitating engagement with the Gαs subunit.
Agonist interact with extracellular loop 2 and extracellular regions of trans-membrane helices 2, 3, 6, and 7. Interactions between catechol-based agonists and three trans-membrane serine residues including S1985.42, S1995.43, and S2025.46 function as microswitches that are essential for receptor activation.
The ligand-binding pocket accommodates both catechol (e.g., dopamine, SKF81297) and non-catechol agonists, with selectivity influenced by residues like V3177.39 and W3217.43 in TM7, which form hydrophobic interactions rather than the polar contacts seen in β2-adrenergic receptors. Non-catechol agonists bind in an extended conformation, spanning the orthosteric site to extracellular loop 2 (ECL2), leveraging unique pocket topology for D1R specificity. Structural comparisons with D2R highlight divergent cytoplasmic features—D1R's elongated TM5 and larger Gs interface (~1,520 Å2) contrast with D2R's Gi-selective coupling, underpinning functional specificity. These insights provide templates for designing selective therapeutics targeting dopaminergic pathways.