Multiple D2 dopamine receptors produced by alternative RNA splicing.

Nature
F J MonsmaD R Sibley

Abstract

Dopamine receptor belong to a large class of neurotransmitter and hormone receptors that are linked to their signal transduction pathways through guanine nucleotide binding regulatory proteins (G proteins). Pharmacological, biochemical and physiological criteria have been used to define two subcategories of dopamine receptors referred to as D1 and D2. D1 receptors activate adenylyl cyclase and are coupled with the Gs regulatory protein. By contrast, activation of D2 receptors results in various responses including inhibition of adenylyl cyclase, inhibition of phosphatidylinositol turnover, increase in K+ channel activity and inhibition of Ca2+ mobilization. The G protein(s) linking the D2 receptors to these responses have not been identified, although D2 receptors have been shown to both copurify and functionally reconstitute with both Gi and Go related proteins. The diversity of responses elicited by D2-receptor activation could reflect the existence of multiple D2 receptor subtypes, the identification of which is facilitated by the recent cloning of a complementary DNA encoding a rat D2 receptor. This receptor exhibits considerable amino-acid homology with other members of the G protein-coupled receptor superfamily. Here we r...Continue Reading

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Alternative splicing

Alternative splicing a regulated gene expression process that allows a single genetic sequence to code for multiple proteins. Here is that latest research.