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. 2015 Sep 11;290(44):26373–26382. doi: 10.1074/jbc.M115.657940

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© 2015 by The American Society for Biochemistry and Molecular Biology, Inc.

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FIGURE 7. — Molecular models of GRASP65/GM130/P115-mediated cis-cisternae membrane stacking and vesicle tethering. A, “double wheel” model of GRASP65/GM130/P115-mediated cis-cisternae membrane stacking. The P115 dimer and GM130 hexamer bridge the two rings formed by the six GRASP65 molecules at opposing cisternae membranes. B, “single wheel” model of GRASP65/GM130/P115/Giantin-mediated vesicle tethering. The structure at one side of the cisternae membrane is represented by a double wheel model. At the other side, P115 binds to the Giantin N terminus on the vesicle instead of GM130 and bridges the vesicles and the cisterna membrane.