作者: Scott M. Stagg , Cemal Gürkan , Douglas M. Fowler , Paul LaPointe , Ted R. Foss
DOI: 10.1038/NATURE04339
关键词:
摘要: Endomembranes of eukaryotic cells are dynamic structures that in continuous communication through the activity specialized cellular machineries, such as coat protein complex II (COPII), which mediates cargo export from endoplasmic reticulum (ER). COPII consists Sar1 GTPase, Sec23 and Sec24 (Sec23/24), where is a Sar1-specific GTPase-activating functions selection, Sec13 Sec31 (Sec13/31), has structural role. Whereas recent results have shown Sec23/24 Sec13/31 can self-assemble to form cage-like particles, we now show minimal cages absence Sec23/24. We present three-dimensional reconstruction these at 30 A resolution using cryo-electron microscopy single particle analysis. These reveal novel cuboctahedron geometry with potential flexible lattice generate diverse range containers. Our data consistent model for assembly non-structural role multivalent ligand localizing self-assembly cage driving ER export.