1. Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, 142292 Pushchino, Moscow Region, Russia Federation, Institute of Molecular Biology, University Jena, Winzerlaerstrasse 11, D-07745 Jena, Germany, and Hans-Knöll-Institute for Natural Products Research, Beutenbergstrasse 11, D-07745 Jena, Germany