Data and code availability
Coordinates, structure factor files and cryo-EM maps are deposited in the Protein Data bank and Electron Microscopy Data Bank with PDB: 7A3N, 7A3O, 7A3P, 7A3Q, 7A3R, 7A3S, 7A3T, 7A3U, 7CTH, and EMDB: 30465. Any additional information required to reanalyze the data reported in this work paper is available from the lead contact upon request.