1. Central European Institute of Technology, Masaryk University, Kamenice 5; Brno 62500 Czech Republic
2. National Centre for Biomolecular Research; Faculty of Science, Masaryk University, Kotlarska 2; Brno 61137 Czech Republic
3. Department of Biochemistry; Faculty of Science, Masaryk University, Kotlarska 2; Brno 61137 Czech Republic