1. Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235, United States
2. Institute of Biochemistry and Molecular Biology, University of Hamburg, Hamburg 20146, Germany
3. Department of Biochemistry, University of Munich, 81377 Munich, Germany
4. Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37205, United States
5. Mass Spectrometry Research Center, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, United States
6. Department of Molecular Biology and Genetics, Johns Hopkins University. Baltimore, Maryland 21205, United States
7. Department of Pharmacology, Vanderbilt University, Nashville, Tennessee 37232, United States
8. Vanderbilt Center for Structural Biology, Nashville, Tennessee 37232, United States
9. Howard Hughes Medical Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, United States
10. Vanderbilt Institute of Chemical Biology, Nashville, Tennessee 37205, United States