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Two functional domains in C. elegans glypican LON-2 can independently inhibit BMP-like signaling.

Dev. Biol.2012 Nov 1;371(1):66-76. Epub 2012 Aug 18
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摘要


Glypicans are multifunctional proteoglycans with regulatory roles in several intercellular signaling pathways. Here, we examine the functional requirements for glypican regulation of bone morphogenetic protein (BMP)-mediated body length in C. elegans. We provide evidence that two parts of C. elegans glypican LON-2 can independently inhibit BMP signaling in vivo: the N-terminal furin protease product and the C-terminal region containing heparan sulfate attachment sequences. While the C-terminal protease product is dispensable for LON-2 minimal core protein activity, it does affect the localization of LON-2. Cleavage of LON-2 into two parts at the conserved furin protease site is not required for LON-2 to inhibit BMP-like signaling. The glycosyl-phosphatidylinositol (GPI) membrane anchor is also not absolutely required for LON-2 activity. Finally, we show that an RGD protein-protein interaction motif in the LON-2 N-terminal domain is necessary for LON-2 core protein activity, suggesting that LON-2 inhibits BMP signaling by acting as a scaffold for BMP and an RGD-binding protein.

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