A transmembrane protein required for acetylcholine receptor clustering in Caenorhabditis elegans

Christelle Gally, Stefan Eimer, Janet E. Richmond and Jean-Louis Bessereau ()
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Christelle Gally: INSERM U.497, École Normale Supérieure
Stefan Eimer: INSERM U.497, École Normale Supérieure
Janet E. Richmond: University of Illinois at Chicago
Jean-Louis Bessereau: INSERM U.497, École Normale Supérieure

Nature, 2004, vol. 431, issue 7008, 578-582

Abstract: Abstract Clustering neurotransmitter receptors at the synapse is crucial for efficient neurotransmission. Here we identify a Caenorhabditis elegans locus, lev-10, required for postsynaptic aggregation of ionotropic acetylcholine receptors (AChRs). lev-10 mutants were identified on the basis of weak resistance to the anthelminthic drug levamisole, a nematode-specific cholinergic agonist that activates AChRs present at neuromuscular junctions (NMJs) resulting in muscle hypercontraction and death at high concentrations1,2,3. In lev-10 mutants, the density of levamisole-sensitive AChRs at NMJs is markedly reduced, yet the number of functional AChRs present at the muscle cell surface remains unchanged. LEV-10 is a transmembrane protein localized to cholinergic NMJs and required in body-wall muscles for AChR clustering. We also show that the LEV-10 extracellular region, containing five predicted CUB domains and one LDLa domain, is sufficient to rescue AChR aggregation in lev-10 mutants. This suggests a mechanism for AChR clustering that relies on extracellular protein–protein interactions. Such a mechanism is likely to be evolutionarily conserved because CUB/LDL transmembrane proteins similar to LEV-10, but lacking any assigned function, are expressed in the mammalian nervous system and might be used to cluster ionotropic receptors in vertebrates.

Date: 2004
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DOI: 10.1038/nature02893

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