1. Department of Molecular Biology, Cell Biology, and Biochemistry, Brown University, Providence, Rhode Island02891, United States
2. Department of Chemistry, McGill University, Montreal, QuebecH3A 0B8, Canada
3. Department of Biochemistry and Structural Biology, University of Texas Health Science Center, San Antonio, Texas78229, United States
4. Northeastern Collaborative Access Team, Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York14853, United States