1. Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas 77843, Department of Chemistry, Texas A&M University, College Station, Texas 77842, Howard Hughes Medical Institute, Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, New York 10461, U.S. Food and Drug Administration, Microbiological Sciences Branch, Jamaica, New York 11433, Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, North Carolina 27599,...