1 Biofisika Institute (CSIC, UPV/EHU), University of the Basque Country, 48940, Leioa, Spain.
2 Department of Biochemistry and Molecular Biology, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), 48940, Leioa, Spain.
3 Department of Macromolecular Structure, National Centre for Biotechnology (CNB-CSIC), 28049, Madrid, Spain.
4 Insilichem, Departament de Química, Universitat Autònoma de Barcelona, (UAB), 08193, Bellaterra (Barcelona), Spain.
5 Department of Macromolecular Structure, National Centre for Biotechnology (CNB-CSIC), 28049, Madrid, Spain. jmv@cnb.csic.es.
6 Biofisika Institute (CSIC, UPV/EHU), University of the Basque Country, 48940, Leioa, Spain. arturo.muga@ehu.eus.
7 Department of Biochemistry and Molecular Biology, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), 48940, Leioa, Spain. arturo.muga@ehu.eus.