1 Department of Molecular Microbiology, John Innes Centre, Norwich NR4 7UH, United Kingdom. Electronic address: susan.schlimpert@jic.ac.uk.
2 Center for Synthetic Microbiology (SYNMIKRO), Department of Biology, University of Marburg, 35032 Marburg, Germany; Max Planck Fellow Group Bacterial Cell Biology, Max Planck Institute for Terrestrial Microbiology, 35043 Marburg, Germany. Electronic address: thanbichler@uni-marburg.de.