1. Institute of BiotechnologyRWTH Aachen University Worringer Weg 3 52074 Aachen Germany
2. Beijing Bioprocess Key Laboratory and College of Life Science and TechnologyBeijing University of Chemical Technology Beijing 100029 P. R. China
3. Institute of Molecular Enzyme TechnologyHeinrich Heine University Düsseldorf and Research Center Jülich, Wilhelm Johnen Strasse 52426 Jülich Germany
4. DWI Leibniz-Institute for Interactive Materials Forckenbeckstrasse 50 52074 Aachen Germany