1. Department
of Pharmacy and Biochemistry, Johannes Gutenberg-University, D-55128 Mainz, Germany
2. Center for Biomembrane Research,
Department of Biochemistry and Biophysics, Stockholm University, SE-10691 Stockholm, Sweden
3. Department of Microbiology, University of Osnabrück, D-49076 Osnabrück, Germany
4. Molecular Microbiology, University of Osnabrück, D-49076 Osnabrück, Germany