Institute of Molecular Biology - Biocenter, Medical University of Innsbruck, Innsbruck, Austria. Department of Molecular and Applied Microbiology, Leibniz Institute for Natural Product Research and Infection Biology-Hans Knöll Institute (HKI), Jena, Germany. Department of Molecular and Applied Microbiology, Leibniz Institute for Natural Product Research and Infection Biology-Hans Knöll Institute (HKI), Jena, Germany; Department Microbiology and Molecular Biology, Institute of Microbiology, Friedrich Schiller University Jena, Jena, Germany. Institute of Molecular Biology - Biocenter, Medical University of Innsbruck, Innsbruck, Austria. Electronic address: hubertus.haas@i-med.ac.at.