1. Laboratory of Microbial Genetics and Gene Expression, Institute of Microbiology of the Czech Academy of Sciences , Vídeňská 1083, 14220 Prague, Czech Republic
2. Laboratory of Structure and Function of Biomolecules, Institute of Biotechnology of the Czech Academy of Sciences , Centre BIOCEV, Průmyslová 595, 25250 Vestec, Czech Republic
3. Cryogenic Electron Microscopy Research-Service Group, Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences , Flemingovo náměstí 2, 16000 Prague, Czech Republic