Ocular albinism: evidence for a defect in an intracellular signal transduction system.

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 Genet

journal_title

Nature genetics

authors

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 A

doi

10.1038/12715

keywords:

subject

Has Abstract

pub_date

1999-09-01 00:00:00

pages

108-12

issue

1

eissn

1061-4036

issn

1546-1718

journal_volume

23

pub_type

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