7zch
From Proteopedia
(Difference between revisions)
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== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[7zch]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7ZCH OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7ZCH FirstGlance]. <br> | <table><tr><td colspan='2'>[[7zch]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7ZCH OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7ZCH FirstGlance]. <br> | ||
| - | </td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=7zch FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7zch OCA], [https://pdbe.org/7zch PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7zch RCSB], [https://www.ebi.ac.uk/pdbsum/7zch PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7zch ProSAT]</span></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.6Å</td></tr> |
| + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=7zch FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7zch OCA], [https://pdbe.org/7zch PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7zch RCSB], [https://www.ebi.ac.uk/pdbsum/7zch PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7zch ProSAT]</span></td></tr> | ||
</table> | </table> | ||
== Function == | == Function == | ||
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The endosomal sorting complex required for transport (ESCRT) is a highly conserved protein machinery that drives a divers set of physiological and pathological membrane remodeling processes. However, the structural basis of ESCRT-III polymers stabilizing, constricting and cleaving negatively curved membranes is yet unknown. Here we present cryo-EM structures of membrane-coated CHMP2A-CHMP3 filaments from Homo sapiens of two different diameters at 3.3 and 3.6 A resolution. The structures reveal helical filaments assembled by CHMP2A-CHMP3 heterodimers in the open ESCRT-III conformation, which generates a partially positive charged membrane interaction surface, positions short N-terminal motifs for membrane interaction and the C-terminal VPS4 target sequence toward the tube interior. Inter-filament interactions are electrostatic, which may facilitate filament sliding upon VPS4-mediated polymer remodeling. Fluorescence microscopy as well as high-speed atomic force microscopy imaging corroborate that VPS4 can constrict and cleave CHMP2A-CHMP3 membrane tubes. We therefore conclude that CHMP2A-CHMP3-VPS4 act as a minimal membrane fission machinery. | The endosomal sorting complex required for transport (ESCRT) is a highly conserved protein machinery that drives a divers set of physiological and pathological membrane remodeling processes. However, the structural basis of ESCRT-III polymers stabilizing, constricting and cleaving negatively curved membranes is yet unknown. Here we present cryo-EM structures of membrane-coated CHMP2A-CHMP3 filaments from Homo sapiens of two different diameters at 3.3 and 3.6 A resolution. The structures reveal helical filaments assembled by CHMP2A-CHMP3 heterodimers in the open ESCRT-III conformation, which generates a partially positive charged membrane interaction surface, positions short N-terminal motifs for membrane interaction and the C-terminal VPS4 target sequence toward the tube interior. Inter-filament interactions are electrostatic, which may facilitate filament sliding upon VPS4-mediated polymer remodeling. Fluorescence microscopy as well as high-speed atomic force microscopy imaging corroborate that VPS4 can constrict and cleave CHMP2A-CHMP3 membrane tubes. We therefore conclude that CHMP2A-CHMP3-VPS4 act as a minimal membrane fission machinery. | ||
| - | Structural basis of CHMP2A-CHMP3 ESCRT-III polymer assembly and membrane cleavage.,Azad K, Guilligay D, Boscheron C, Maity S, De Franceschi N, Sulbaran G, Effantin G, Wang H, Kleman JP, Bassereau P, Schoehn G, Roos WH, Desfosses A, Weissenhorn W Nat Struct Mol Biol. 2023 Jan | + | Structural basis of CHMP2A-CHMP3 ESCRT-III polymer assembly and membrane cleavage.,Azad K, Guilligay D, Boscheron C, Maity S, De Franceschi N, Sulbaran G, Effantin G, Wang H, Kleman JP, Bassereau P, Schoehn G, Roos WH, Desfosses A, Weissenhorn W Nat Struct Mol Biol. 2023 Jan;30(1):81-90. doi: 10.1038/s41594-022-00867-8. Epub , 2023 Jan 5. PMID:36604498<ref>PMID:36604498</ref> |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
</div> | </div> | ||
<div class="pdbe-citations 7zch" style="background-color:#fffaf0;"></div> | <div class="pdbe-citations 7zch" style="background-color:#fffaf0;"></div> | ||
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| + | ==See Also== | ||
| + | *[[Vacuolar protein sorting-associated protein 3D structures|Vacuolar protein sorting-associated protein 3D structures]] | ||
== References == | == References == | ||
<references/> | <references/> | ||
Current revision
CHMP2A-CHMP3 heterodimer (410 Angstrom diameter)
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