1. BASF AG, Physical Chemistry and Informatics, Fine Chemicals and Biocatalysis Research, 67056 Ludwigshafen, Germany, University Freiburg, Institute for Biology II, Microbiology, Schänzlestrasse 1, 79104 Freiburg, Germany, Max Planck Institute for Molecular Genetics, Ihnestrasse 73, 14195 Berlin, Germany, and Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, 28359 Bremen, Germany