1. Biocatalysis DepartmentInstitute of Catalysis and Petrochemistry (CSIC) Madrid 28049 Spain
2. Macromolecular Crystallography and Structural Biology Department Institute of Physical-Chemistry Rocasolano (CSIC) Madrid 28006 Spain
3. Molecular Biology Department Centre of Molecular Biology Severo Ochoa (CSIC-UAM)Autonomous University of Madrid Madrid 28049 Spain
4. CIC bioGUNE: Center for Cooperative Research in Biosciences Basque Network of Science Technology and InnovationBiscay Science and Technology Park Derio 48160 Spain