1. Department of Molecular and Cellular Biochemistry, Indiana University Bloomington, Simon Hall 001, 212 South Hawthorne Drive, Bloomington, Indiana 47405, United States
2. The Centre for Bacterial Cell Biology, Newcastle University, Richardson Road, Newcastle upon Tyne NE2 4AX, United Kingdom
3. Department of Chemistry, Indiana University Bloomington, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States