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PMID:20603001

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Citation

Jin, H, White, SR, Shida, T, Schulz, S, Aguiar, M, Gygi, SP, Bazan, JF and Nachury, MV (2010) The conserved Bardet-Biedl syndrome proteins assemble a coat that traffics membrane proteins to cilia. Cell 141:1208-19

Abstract

The BBSome is a complex of Bardet-Biedl Syndrome (BBS) proteins that shares common structural elements with COPI, COPII, and clathrin coats. Here, we show that the BBSome constitutes a coat complex that sorts membrane proteins to primary cilia. The BBSome is the major effector of the Arf-like GTPase Arl6/BBS3, and the BBSome and GTP-bound Arl6 colocalize at ciliary punctae in an interdependent manner. Strikingly, Arl6(GTP)-mediated recruitment of the BBSome to synthetic liposomes produces distinct patches of polymerized coat apposed onto the lipid bilayer. Finally, the ciliary targeting signal of somatostatin receptor 3 needs to be directly recognized by the BBSome in order to mediate targeting of membrane proteins to cilia. Thus, we propose that trafficking of BBSome cargoes to cilia entails the coupling of BBSome coat polymerization to the recognition of sorting signals by the BBSome.

Links

PubMed PMC2898735 Online version:10.1016/j.cell.2010.05.015

Keywords

ADP-Ribosylation Factors/metabolism; Animals; Bardet-Biedl Syndrome/metabolism; Cattle; Cell Membrane/metabolism; Cilia/metabolism; Humans; Liposomes/metabolism; Mice; Multiprotein Complexes/metabolism; Phospholipids/metabolism; Protein Folding; Protein Transport; Receptors, Somatostatin/metabolism; Retina/metabolism; Tissue Extracts/metabolism

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