1. Institute of Biochemistry; Saarland University; Saarbrücken Germany
2. Department of Structural Biology; Institute of Biophysics and Center of Human and Molecular Biology (ZHMB); Saarland University; Homburg Germany
3. Department of Microbial Natural Products; Helmholtz Institute for Pharmaceutical Research Saarland (HIPS); Helmholtz Centre for Infection Research and Pharmaceutical Biotechnology; Saarland University; Saarbrücken Germany