1. The Linderstrøm-Lang Centre for Protein Science, Section for Biomolecular Sciences, Department of Biology, University of Copenhagen, Ole Maaløes Vej 5, 2200 Copenhagen, Denmark
2. Institute for Advanced Chemistry of Catalonia (IQAC), CSIC, Carrer Jordi Girona 18-26, 08034 Barcelona, Spain
3. Protein Design and Modeling Lab, Department of Structural and Molecular Biology, Molecular Biology Institute of Barcelona (IBMB), CSIC, Baldiri Reixac 10, 08028 Barcelona, Spain
4. Molecular Microbiology and Structural Biochemistry, CNRS, University of Lyon1, UMR5086, 7 Passage du Vercors, F-69367 Lyon CEDEX 07, France