1. Structural and Molecular Microbiology, Structural Biology Research Center, VIB , Pleinlaan 2, 1050 Brussels, Belgium
2. Structural Biology Brussels, Vrije Universiteit Brussel , Pleinlaan 2, 1050 Brussels, Belgium
3. Louvain Institute of Biomolecular Science and Technology, UCLouvain , Croix du Sud, 4-5, bte L7.07.07, B-1348 Louvain-la-Neuve, Belgium