1National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China
2University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
3Structural Biology Center, Biosciences, Argonne National Laboratory, 9700 S Cass Avenue, Argonne, IL 60439, USA
4National Center for Protein Science Shanghai, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 201203, People’s Republic of China