| Structural highlights
Function
[SEC31_YEAST] Component of the coat protein complex II (COPII) which promotes the formation of transport vesicles from the endoplasmic reticulum (ER). The coat has two main functions, the physical deformation of the endoplasmic reticulum membrane into vesicles and the selection of cargo molecules.[1] [2] [3] [4] [5] [6] [SEC13_YEAST] Functions as a component of the nuclear pore complex (NPC) and the COPII coat. It is one of 5 proteins constituting the COPII coat, which is involved in anterograde (ER to Golgi) double-membrane transport vesicle formation. First the small GTPase SAR1, activated by and binding to the integral ER membrane protein SEC12, exchanges GDP for GTP and recruits the heterodimer SEC23/24, which in turn recruits the heterotetramer SEC13-SEC31. The polymerization of COPII coat complexes then causes physically the deformation (budding) of the membrane, leading to the creation of a transport vesicle. The COPII complex is dissociated upon SAR1-GTP hydrolysis to SAR1-GDP. SEC23 functions as the SAR1 GTPase activating protein, whose activity is stimulated in the presence of SEC13/31. SEC13 is directly or indirectly required for normal ER membrane and nuclear envelope morphology. It also functions as a component of the nuclear pore complex (NPC). NPC components, collectively referred to as nucleoporins (NUPs), can play the role of both NPC structural components and of docking or interaction partners for transiently associated nuclear transport factors. SEC13 is required for efficient mRNA export from the nucleus to the cytoplasm and for correct nuclear pore biogenesis and distribution. Component of the SEA complex which coats the vacuolar membrane and is involved in intracellular trafficking, autophagy, response to nitrogen starvation, and amino acid biogenesis.[7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25]
Publication Abstract from PubMed
Coat protein complex II (COPII) mediates formation of the membrane vesicles that export newly synthesised proteins from the endoplasmic reticulum. The inner COPII proteins bind to cargo and membrane, linking them to the outer COPII components that form a cage around the vesicle. Regulated flexibility in coat architecture is essential for transport of a variety of differently sized cargoes, but structural data on the assembled coat has not been available. We have used cryo-electron tomography and subtomogram averaging to determine the structure of the complete, membrane-assembled COPII coat. We describe a novel arrangement of the outer coat and find that the inner coat can assemble into regular lattices. The data reveal how coat subunits interact with one another and with the membrane, suggesting how coordinated assembly of inner and outer coats can mediate and regulate packaging of vesicles ranging from small spheres to large tubular carriers. DOI:http://dx.doi.org/10.7554/eLife.00951.001.
The structure of the COPII transport-vesicle coat assembled on membranes.,Zanetti G, Prinz S, Daum S, Meister A, Schekman R, Bacia K, Briggs JA Elife. 2013 Sep 17;2:e00951. doi: 10.7554/eLife.00951. PMID:24062940[26]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Bednarek SY, Ravazzola M, Hosobuchi M, Amherdt M, Perrelet A, Schekman R, Orci L. COPI- and COPII-coated vesicles bud directly from the endoplasmic reticulum in yeast. Cell. 1995 Dec 29;83(7):1183-96. PMID:8548805
- ↑ Wuestehube LJ, Duden R, Eun A, Hamamoto S, Korn P, Ram R, Schekman R. New mutants of Saccharomyces cerevisiae affected in the transport of proteins from the endoplasmic reticulum to the Golgi complex. Genetics. 1996 Feb;142(2):393-406. PMID:8852839
- ↑ Salama NR, Chuang JS, Schekman RW. Sec31 encodes an essential component of the COPII coat required for transport vesicle budding from the endoplasmic reticulum. Mol Biol Cell. 1997 Feb;8(2):205-17. PMID:9190202
- ↑ Campbell JL, Schekman R. Selective packaging of cargo molecules into endoplasmic reticulum-derived COPII vesicles. Proc Natl Acad Sci U S A. 1997 Feb 4;94(3):837-42. PMID:9023343
- ↑ Matsuoka K, Schekman R. The use of liposomes to study COPII- and COPI-coated vesicle formation and membrane protein sorting. Methods. 2000 Apr;20(4):417-28. PMID:10720463 doi:10.1006/meth.2000.0955
- ↑ Sato K, Nakano A. Reconstitution of coat protein complex II (COPII) vesicle formation from cargo-reconstituted proteoliposomes reveals the potential role of GTP hydrolysis by Sar1p in protein sorting. J Biol Chem. 2004 Jan 9;279(2):1330-5. Epub 2003 Nov 19. PMID:14627716 doi:10.1074/jbc.C300457200
- ↑ Siniossoglou S, Wimmer C, Rieger M, Doye V, Tekotte H, Weise C, Emig S, Segref A, Hurt EC. A novel complex of nucleoporins, which includes Sec13p and a Sec13p homolog, is essential for normal nuclear pores. Cell. 1996 Jan 26;84(2):265-75. PMID:8565072
- ↑ Novick P, Field C, Schekman R. Identification of 23 complementation groups required for post-translational events in the yeast secretory pathway. Cell. 1980 Aug;21(1):205-15. PMID:6996832
- ↑ Novick P, Ferro S, Schekman R. Order of events in the yeast secretory pathway. Cell. 1981 Aug;25(2):461-9. PMID:7026045
- ↑ Kaiser CA, Schekman R. Distinct sets of SEC genes govern transport vesicle formation and fusion early in the secretory pathway. Cell. 1990 May 18;61(4):723-33. PMID:2188733
- ↑ Bednarek SY, Ravazzola M, Hosobuchi M, Amherdt M, Perrelet A, Schekman R, Orci L. COPI- and COPII-coated vesicles bud directly from the endoplasmic reticulum in yeast. Cell. 1995 Dec 29;83(7):1183-96. PMID:8548805
- ↑ Kuehn MJ, Schekman R, Ljungdahl PO. Amino acid permeases require COPII components and the ER resident membrane protein Shr3p for packaging into transport vesicles in vitro. J Cell Biol. 1996 Nov;135(3):585-95. PMID:8909535
- ↑ Roberg KJ, Bickel S, Rowley N, Kaiser CA. Control of amino acid permease sorting in the late secretory pathway of Saccharomyces cerevisiae by SEC13, LST4, LST7 and LST8. Genetics. 1997 Dec;147(4):1569-84. PMID:9409822
- ↑ Roberg KJ, Rowley N, Kaiser CA. Physiological regulation of membrane protein sorting late in the secretory pathway of Saccharomyces cerevisiae. J Cell Biol. 1997 Jun 30;137(7):1469-82. PMID:9199164
- ↑ Sutterlin C, Doering TL, Schimmoller F, Schroder S, Riezman H. Specific requirements for the ER to Golgi transport of GPI-anchored proteins in yeast. J Cell Sci. 1997 Nov;110 ( Pt 21):2703-14. PMID:9427388
- ↑ Campbell JL, Schekman R. Selective packaging of cargo molecules into endoplasmic reticulum-derived COPII vesicles. Proc Natl Acad Sci U S A. 1997 Feb 4;94(3):837-42. PMID:9023343
- ↑ Matsuoka K, Schekman R. The use of liposomes to study COPII- and COPI-coated vesicle formation and membrane protein sorting. Methods. 2000 Apr;20(4):417-28. PMID:10720463 doi:10.1006/meth.2000.0955
- ↑ Siniossoglou S, Lutzmann M, Santos-Rosa H, Leonard K, Mueller S, Aebi U, Hurt E. Structure and assembly of the Nup84p complex. J Cell Biol. 2000 Apr 3;149(1):41-54. PMID:10747086
- ↑ Lederkremer GZ, Cheng Y, Petre BM, Vogan E, Springer S, Schekman R, Walz T, Kirchhausen T. Structure of the Sec23p/24p and Sec13p/31p complexes of COPII. Proc Natl Acad Sci U S A. 2001 Sep 11;98(19):10704-9. Epub 2001 Sep 4. PMID:11535824 doi:10.1073/pnas.191359398
- ↑ Matsuoka K, Schekman R, Orci L, Heuser JE. Surface structure of the COPII-coated vesicle. Proc Natl Acad Sci U S A. 2001 Nov 20;98(24):13705-9. PMID:11717432 doi:10.1073/pnas.241522198
- ↑ Ryan KJ, Wente SR. Isolation and characterization of new Saccharomyces cerevisiae mutants perturbed in nuclear pore complex assembly. BMC Genet. 2002 Sep 5;3:17. Epub 2002 Sep 5. PMID:12215173
- ↑ Lutzmann M, Kunze R, Buerer A, Aebi U, Hurt E. Modular self-assembly of a Y-shaped multiprotein complex from seven nucleoporins. EMBO J. 2002 Feb 1;21(3):387-97. PMID:11823431 doi:10.1093/emboj/21.3.387
- ↑ Fatal N, Suntio T, Makarow M. Selective protein exit from yeast endoplasmic reticulum in absence of functional COPII coat component Sec13p. Mol Biol Cell. 2002 Dec;13(12):4130-40. PMID:12475940 doi:10.1091/mbc.02-05-0082
- ↑ Sato K, Nakano A. Reconstitution of coat protein complex II (COPII) vesicle formation from cargo-reconstituted proteoliposomes reveals the potential role of GTP hydrolysis by Sar1p in protein sorting. J Biol Chem. 2004 Jan 9;279(2):1330-5. Epub 2003 Nov 19. PMID:14627716 doi:10.1074/jbc.C300457200
- ↑ Dokudovskaya S, Waharte F, Schlessinger A, Pieper U, Devos DP, Cristea IM, Williams R, Salamero J, Chait BT, Sali A, Field MC, Rout MP, Dargemont C. A conserved coatomer-related complex containing Sec13 and Seh1 dynamically associates with the vacuole in Saccharomyces cerevisiae. Mol Cell Proteomics. 2011 Jun;10(6):M110.006478. doi: 10.1074/mcp.M110.006478., Epub 2011 Mar 31. PMID:21454883 doi:10.1074/mcp.M110.006478
- ↑ Zanetti G, Prinz S, Daum S, Meister A, Schekman R, Bacia K, Briggs JA. The structure of the COPII transport-vesicle coat assembled on membranes. Elife. 2013 Sep 17;2:e00951. doi: 10.7554/eLife.00951. PMID:24062940 doi:http://dx.doi.org/10.7554/eLife.00951
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