Abstract:
:G protein-coupled receptors (GPCRs) participate in the most common signal transduction system at the plasma membrane. The wide distribution of heterotrimeric G proteins in the internal membranes suggests that a similar signalling mechanism might also be used at intracellular locations. We provide here structural evidence that the protein product of the ocular albinism type 1 gene (OA1), a pigment cell-specific integral membrane glycoprotein, represents a novel member of the GPCR superfamily and demonstrate that it binds heterotrimeric G proteins. Moreover, we show that OA1 is not found at the plasma membrane, being instead targeted to specialized intracellular organelles, the melanosomes. Our data suggest that OA1 represents the first example of an exclusively intracellular GPCR and support the hypothesis that GPCR-mediated signal transduction systems also operate at the internal membranes in mammalian cells.
journal_name
Nat Genetjournal_title
Nature geneticsauthors
Schiaffino MV,d'Addio M,Alloni A,Baschirotto C,Valetti C,Cortese K,Puri C,Bassi MT,Colla C,De Luca M,Tacchetti C,Ballabio Adoi
10.1038/12715keywords:
subject
Has Abstractpub_date
1999-09-01 00:00:00pages
108-12issue
1eissn
1061-4036issn
1546-1718journal_volume
23pub_type
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