Acknowledgements
We thank the staffs from BL19U1 beamline of National Facility for Protein Science in Shanghai (NFPS) at Shanghai Synchrotron Radiation Facility, for assistance during data collection. Author Contributions: G.L. conceived the study and supervised the whole project. F.Y. and S.L. conducted the majority of the experiments. F.Y., Z.C. and D.Y. collected the datasets and solved the structure. D.Y. and M.Y. assisted with the protein preparation. G.L., F.Y. and S.L. wrote the manuscript. B.H., Y.C., H.D., J.L. and Q.Z. provided the reagents and participated in experimental design as well as manuscript editing and discussion.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Data availability
The datasets used and/or analysed during this study are available from the corresponding author on reasonable request. Atomic coordinates and structure factors for the reported crystal structure has been deposited into the Protein Data Bank under accession number 8GP6.