1. Institute for Medical Microbiology and Hospital Epidemiology; Hannover Medical School; Carl-Neuberg Strasse 1 30625 Hannover Germany
2. Center for integrated Protein Science Munich (CiPSM) at the Department of Biology I, Microbiology; Ludwig-Maximilians-Universität München; Großhaderner Strasse 2-4 82152 Martinsried Germany
3. Department of Chemical and Biomolecular Engineering; University of Illinois at Urbana-Champaign; 600 S. Mathews Ave Urbana IL 61801 USA
4. Department of Microbiology and Immunology; Loyola University Chicago, Stritch School of Medicine; 2160 S. First Ave. Bldg. 105 Maywood IL 60153 USA