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Membrane topology of the Drosophila OR83b odorant receptor.


ABSTRACT: By analogy to mammals, odorant receptors (ORs) in insects, such as Drosophila melanogaster, have long been thought to belong to the G-protein coupled receptor (GPCR) superfamily. However, recent work has cast doubt on this assumption and has tentatively suggested an inverted topology compared to the canonical N(out) - C(in) 7 transmembrane (TM) GPCR topology, at least for some Drosophila ORs. Here, we report a detailed topology mapping of the Drosophila OR83b receptor using engineered glycosylation sites as topology markers. Our results are inconsistent with a classical GPCR topology and show that OR83b has an intracellular N-terminus, an extracellular C-terminus, and 7TM helices.

SUBMITTER: Lundin C 

PROVIDER: S-EPMC2176074 | biostudies-literature | 2007 Dec

REPOSITORIES: biostudies-literature

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Membrane topology of the Drosophila OR83b odorant receptor.

Lundin Carolina C   Käll Lukas L   Kreher Scott A SA   Kapp Katja K   Sonnhammer Erik L EL   Carlson John R JR   Heijne Gunnar von Gv   Nilsson IngMarie I  

FEBS letters 20071120 29


By analogy to mammals, odorant receptors (ORs) in insects, such as Drosophila melanogaster, have long been thought to belong to the G-protein coupled receptor (GPCR) superfamily. However, recent work has cast doubt on this assumption and has tentatively suggested an inverted topology compared to the canonical N(out) - C(in) 7 transmembrane (TM) GPCR topology, at least for some Drosophila ORs. Here, we report a detailed topology mapping of the Drosophila OR83b receptor using engineered glycosylat  ...[more]

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