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FEBS Lett. 2000 Apr 14;471(2-3):156-60.

Mammalian calcitonin receptor-like receptor/receptor activity modifying protein complexes define calcitonin gene-related peptide and adrenomedullin receptors in Drosophila Schneider 2 cells.

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Research Laboratory for Calcium Metabolism, Departments of Orthopaedic Surgery and Medicine, University of Zurich, Klinik Balgrist, Forchstrasse 340, 8008, Zurich, Switzerland.


Differential glycosylation of human and rat (r) calcitonin (CT) receptor-like receptors (CRLR) as a result of interactions with accessory receptor activity-modifying proteins (RAMP)1 or -2 was considered to define CT gene-related peptide (CGRP) or adrenomedullin (ADM) receptors in mammalian cells. Here, Drosophila Schneider (S2) cells stably co-expressed rCRLR and RAMP1 or -2 as functional CGRP or ADM receptors. Different from mammalian cells, rCRLR expressed in S2 cells are uniformly glycosylated proteins independent of RAMP1 or RAMP2. Bis(sulfosuccinimidyl)suberate cross-linking revealed receptor components with the size of rCRLR, increased by the molecular weights of the corresponding RAMPs and [(125)I]CGRP or [(125)I]ADM. In conclusion, [(125)I]CGRP/rCRLR/RAMP1 and [(125)I]ADM/rCRLR/RAMP2 complexes have been recognized in Drosophila S2 cells.

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