1. Department of Biochemistry, University of Washington, Seattle, Washington 98195, United States
2. Institute for Protein Design, University of Washington, Seattle, Washington 98195, United States
3. School of Chemistry, Trinity College Dublin, Dublin D02 R590, Ireland
4. School of Medicine and School of Biochemistry and Immunology, Trinity College Dublin, Dublin D02 R590, Ireland
5. Biological Inorganic Chemistry Laboratory, The Francis Crick Institute, London NW1 1AT, U.K.
6. School of Chemistry and Chemical Engineering, Queen’s University Belfast, David Keir Building, Stranmillis Road, Belfast BT9 5AG, U.K.,
7. Department of Microbiology, Moyne Institute of Preventive Medicine, School of Genetics and Microbiology, Trinity College Dublin, Dublin D02 VF25, Ireland
8. Institute of Microbiology and Infection, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, U.K.
9. Howard Hughes Medical Institute, University of Washington, Seattle, Washington 98195, United States