1. Department of Molecular Biology, Institute of Microbiology and Biotechnology, Maria Curie-Skłdowska University, Akademicka 19, 20-033 Lublin, Poland, Department of Biophysical Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden, European Molecular Biology Laboratory, Hamburg Outstation, Notkestrasse 85, 22603 Hamburg, Germany, Institute of Crystallography, Russian Academy of Sciences, Leninsky pr. 59, 117333 Moscow, Russia, Department of Molecular Biophysics, Lund University, P.O. Box 124,...