1 Department of Biochemistry, Institute of Biochemistry and Technical Biochemistry, University of Stuttgart, 70569 Stuttgart, Germany. albert.jeltsch@ibtb.uni-stuttgart.de.
2 Department of Biochemistry, Institute of Biochemistry and Technical Biochemistry, University of Stuttgart, 70569 Stuttgart, Germany. Julian.Broche@ibtb.uni-stuttgart.de.
3 Department of Biochemistry, Institute of Biochemistry and Technical Biochemistry, University of Stuttgart, 70569 Stuttgart, Germany. Pavel.Bashtrykov@ibtb.uni-stuttgart.de.