1. Key Laboratory of Industrial Biotechnology of Ministry of Education and School of Biotechnology Jiangnan University Wuxi China
2. Department of Biological Sciences, 702 Sherman Fairchild Center, MC2434 Columbia University New York NY USA
3. Cryo‐Electron Microscopy Center Columbia University Irving Medical Center New York NY USA
4. Macromolecular Crystallography Shared Resource Herbert Irving Comprehensive Cancer Center Columbia University Irving Medical Center New York NY USA
5. Department of Physiology and Cellular Biophysics and Department of Anesthesiology Columbia University Irving Medical Center New York NY USA
6. Department of Chemistry & Chemical Biology and Center for Biotechnology & Interdisciplinary Sciences Rensselaer Polytechnic Institute Troy NY USA
7. Department of Chemistry State University of New York at Buffalo Buffalo NY USA