1. Department of Molecular Biology and Umeå Centre for Microbial Research, Umeå University, Umeå 901 87, Sweden
2. Department of Chemistry, KTH Royal Institute of Technology, Stockholm 100 44, Sweden
3. Department of Molecular and Clinical Medicine, Wallenberg Laboratory, University of Gothenburg, Gothenburg 413 45, Sweden
4. Département Génie Biologique, Campus SophiaTech, Université Nice Sophia Antipolis, Nice 06900, France