1. Department of Chemistry and Biochemistry, Loyola University Chicago, 1032 West Sheridan Road, Chicago, Illinois 60660, United States
2. Department of Microbiology-Immunology, Northwestern University, Feinberg School of Medicine, Chicago, Illinois 60611, United States
3. Center for Structural Biology of Infectious Diseases, Northwestern University, Feinberg School of Medicine, Chicago, Illinois 60611, United States
4. Department of Pharmacology, Northwestern University, Feinberg School of Medicine, Chicago, Illinois 60611, United States
5. Northwestern Synchrotron Research Center, Life Sciences Collaborative Access Team, Northwestern University, Argonne, Illinois 60439, United States