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• W2068449660 abstract "Cell adhesion molecules of the Immunoglobulin superfamily (IgCAMs) play important roles in neuronal development, homeostasis and disease. Here, we use an animal in vivo assay system to study the function of sax-7, the Caenorhabditis elegans homologue of the human L1 IgCAM, a homophilic adhesion molecule involved in several neurological diseases. We show that the 6 Ig/5 FnIII domain protein SAX-7 acts autonomously in the nervous system to maintain axon position in the ventral nerve cord of the nematode. As previously reported, sax-7 is also required to maintain the relative positioning of neuronal cell bodies in several head ganglia. We use the loss of cellular adhesiveness in sax-7 null mutants as an assay system to investigate the contribution of individual domains and sequence motifs to the function of SAX-7, utilizing transgenic rescue approaches. By shortening the hinge region between the Ig1 + 2 and Ig3 + 4 domains, we improve the adhesive function of SAX-7, thereby providing support for a previously proposed autoinhibitory “horseshoe” conformation of IgCAMs. However, we find that Ig3 + 4 are the only Ig domains required and sufficient for the adhesive function of SAX-7. Previous models of L1-type IgCAMs that invoke an important role of the first two Ig domains in controlling adhesion therefore do not appear to apply to SAX-7. Moreover, we find that neither the 5 FnIII domains, nor the protease cleavage site embedded in them, are required for the adhesive function of SAX-7. Lastly, we show that of the several protein binding motifs present in the intracellular region of SAX-7, only its ankyrin binding motif is required and also solely sufficient to confer the adhesive functions of SAX-7." @default.
• W2068449660 created "2016-06-24" @default.
• W2068449660 creator A5006511186 @default.
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• W2068449660 date "2008-01-01" @default.
• W2068449660 modified "2023-10-02" @default.
• W2068449660 title "Functional dissection of the C. elegans cell adhesion molecule SAX-7, a homologue of human L1" @default.
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• W2068449660 doi "https://doi.org/10.1016/j.mcn.2007.08.014" @default.
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