1. Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235, United States
2. Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee 37212, United States
3. Department of Pathology, Anatomy and Cell Biology, Meharry Medical College, Nashville, Tennessee 37208, United States
4. Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan 48824, United States
5. Department of Life and Physical Sciences, Fisk University, Nashville, Tennessee 37208, United States
6. Department of Biochemistry, Vanderbilt University, Nashville, Tennessee 37205, United States
7. Center for Structural Biology, Vanderbilt University, Nashville, Tennessee 37205, United States
8. Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee 37232 United States
9. Department of Veterans Affairs, Tennessee Valley Healthcare Systems, Nashville, Tennessee 37212, United States