1. The photoreceptor rim protein is an ABC transporter encoded by the gene for recessive Stargardt's disease (ABCR).
- Author
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Azarian SM and Travis GH
- Subjects
- ATP-Binding Cassette Transporters isolation & purification, Amino Acid Sequence, Animals, Cattle, Chromosome Mapping, Chromosomes, Human, Pair 1, DNA, Complementary isolation & purification, Humans, Membrane Glycoproteins isolation & purification, Mice, Molecular Sequence Data, Organ Specificity, ATP-Binding Cassette Transporters chemistry, ATP-Binding Cassette Transporters genetics, Genes, Recessive, Macular Degeneration genetics, Membrane Glycoproteins chemistry, Membrane Glycoproteins genetics, Rod Cell Outer Segment chemistry
- Abstract
Rim protein (RmP) is a high-Mr membrane glycoprotein that has been localized to the rims of photoreceptor outer segment discs, but its molecular identity is unknown. Here, we describe the purification of RmP and present the sequence of its mRNA. RmP is a new member of the ATP-binding cassette (ABC) transporter superfamily. We show that RmP is expressed specifically in photoreceptors and predominantly in outer segments. Further, RmP is identical to the protein recently shown to be affected in recessive Stargardt's disease. RmP is the first ABC transporter observed in photoreceptors and may play a role in the photoresponse.
- Published
- 1997
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