Subtomogram averaging of SARS-CoV-2 nsp3-4 delta Ubl1-Mac1 obtained from cryo-ET of cryo-FIB milled VeroE6 cells transfected with nsp3-4 delta Ubl1-Mac1
マップデータ
Subtomogram average of nsp3-4 deltaubl1-mac1 from cryo-ET of VeroE6 cells transfected with nsp3-4 deltaubl1-mac1 truncation (filtered to 40A).
試料
細胞: VeroE6 cells transfected with SARS-CoV-2 nsp3-4 truncation: pCDNA3.1-HA-nsp3-deltaUbl1-Mac1-nsp4-V5
キーワード
nsp3-4 protein / VIRAL PROTEIN
生物種
Severe acute respiratory syndrome coronavirus 2 (ウイルス)
ジャーナル: Nat Commun / 年: 2023 タイトル: SARS-CoV-2 nsp3 and nsp4 are minimal constituents of a pore spanning replication organelle. 著者: Liv Zimmermann / Xiaohan Zhao / Jana Makroczyova / Moritz Wachsmuth-Melm / Vibhu Prasad / Zach Hensel / Ralf Bartenschlager / Petr Chlanda / 要旨: Coronavirus replication is associated with the remodeling of cellular membranes, resulting in the formation of double-membrane vesicles (DMVs). A DMV-spanning pore was identified as a putative portal ...Coronavirus replication is associated with the remodeling of cellular membranes, resulting in the formation of double-membrane vesicles (DMVs). A DMV-spanning pore was identified as a putative portal for viral RNA. However, the exact components and the structure of the SARS-CoV-2 DMV pore remain to be determined. Here, we investigate the structure of the DMV pore by in situ cryo-electron tomography combined with subtomogram averaging. We identify non-structural protein (nsp) 3 and 4 as minimal components required for the formation of a DMV-spanning pore, which is dependent on nsp3-4 proteolytic cleavage. In addition, we show that Mac2-Mac3-DPUP-Ubl2 domains are critical for nsp3 oligomerization and crown integrity which influences membrane curvature required for biogenesis of DMVs. Altogether, SARS-CoV-2 nsp3-4 have a dual role by driving the biogenesis of replication organelles and assembly of DMV-spanning pores which we propose here to term replicopores.