1 Department of Cell Biology, Blavatnik Institute, Harvard Medical School, Boston, MA, USA. Electronic address: Jonathan_Markert@hms.harvard.edu.
2 Department of Biochemistry, University of Colorado Boulder, Boulder, CO, USA; Howard Hughes Medical Institute, Chevy Chase, MD, USA. Electronic address: Karolin.Luger@Colorado.edu.
3 Department of Biological and Chemical Engineering, Dongyang Mirae University, Seoul, South Korea. Electronic address: hayunlee@dongyang.ac.kr.
4 Structural Biology of Molecular Machines Group, Protein Structure & Function Program, Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark. Electronic address: haidai.hu@cpr.ku.dk.
5 Structural Biology of Molecular Machines Group, Protein Structure & Function Program, Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark. Electronic address: nicholas.taylor@cpr.ku.dk.
6 Laboratory of Cellular and Structural Biology, The Rockefeller University, New York, NY, USA; Ikerbasque, Basque Foundation for Science and Instituto Biofisika (UPV/EHU, CSIC), University of the Basque Country, Leioa, Spain. Electronic address: jfernandez@mail.rockefeller.edu.
7 Laboratory of Cellular and Structural Biology, The Rockefeller University, New York, NY, USA. Electronic address: rout@mail.rockefeller.edu.
8 Department of Molecular and Cell Biology, University of Connecticut, Storrs, CT, USA. Electronic address: nathan.alder@uconn.edu.