2021-06-02 REL PDBe PDBe PDBe 2021-05-14 2021-06-02 2021-06-02 2021-06-02 German Research Foundation (DFG) 240245660 Germany German Research Foundation (DFG) 272983813 Germany German Research Foundation (DFG) 415089553 Germany Cortese M Schwab Y Bartenschlager R Schorb M Cortese M Lee JY Cerikan B Neufeldt CJ Oorschot VMJ Kohrer S Hennies J Schieber NL Ronchi P Mizzon G Romero-Brey I Santarella-Mellwig R Schorb M Boermel M Mocaer K Beckwith MS Templin RM Gross V Pape C Tischer C Frankish J Horvat NK Laketa V Stanifer M Boulant S Ruggieri A Chatel-Chaix L Schwab Y Bartenschlager R Cell Host Microbe US 28 853 866.e5 2020 33245857 doi:10.1016/j.chom.2020.11.003 1934-6069 EMD-12940 associated EM volume Calu-3 cell line infected with SARS-CoV-2 isolate Bavpat1/2020 Calu-3 cell line infected with SARS-CoV-2 isolate Bavpat1/2020 0 Homo sapiens Lung Epithelial adenocarcinoma cell tomography tissue 7.4 POSITIVE osmium-ferricyanide, Uranyl acetate, Lead citrate Epon 812 Homemade COPPER FORMVAR

Calu-3 cells infected with SARS-CoV-2 at MOI = 5, fixed by adding 2x concentrated EM fixative (composition of the 1x fixative: 2.5% glutaraldehyde in 50 mM Na-cacodylate buffer (pH 7.4) containing 50 mM KCl, 2.6 mM MgCl2, 2.6 mM CaCl2 and 2% sucrose) to the cell culture medium (1:1) for 5 min at RT in 12 wells plates. Fixative was removed and replaced by 1x fixative for 2 h at RT. Plates were plunged in 6% formaldehyde for inactivation for 30 min at RT before being transported outside the BSL3 area. Fixative was exchanged again with 1x EM fixative and the samples were stored at 4C until further processing. Prior to embedding cells were rinsed 6 times with 100 mM Na-cacodylate for 10 min each. Subsequently, cells were post-fixed with osmium-ferricyanide (1% OsO4, 1.5% K3Fe(III)(CN)6, 0.065 M Na-cacodylate buffer) for 2 h at 4C in the dark. Further processing was done in the microwave. Cells were washed five times with dH2O for 1 min each, stained four times with 1% uranyl acetate in dH2O for 2 min each, rinsed three times with dH2O for 1 min. Dehydration with an ethanol series (50%, 70%, 90% and 4x 100%) was then performed for 40 s each on ice in the microwave. Cells were infiltrated in Epon 812 resin with increasing percentages of this resin in ethanol (10%, 30%, 50%, 70%, 90% and 2x 100%) for 3 min each in the microwave. The coverslips with the cells facing down were placed on a BEEM capsule filled with Epon 812 resin. Beem capsule and coverslip were turned upside down and polymerized at 60C. After one day the glass coverslips were removed from the blocks that were incubated for 2 more days at 60C. Grids were post-stained with Uranyl acetate and lead citrate.

Leica EM UC7 293 200 FEI TECNAI F30 FLOOD BEAM BRIGHT FIELD FIELD EMISSION GUN 300 0.5 15500.0 FISCHIONE INSTRUMENTS DUAL AXIS TOMOGRAPHY HOLDER OTHER 2024 2024 1 242 0.2 3.6 1

Gatan OneView

BACK PROJECTION IMOD 4.10 242