1. School of Chemistry and Molecular Biosciences University of Queensland Brisbane 4072 Australia
2. Center for Integrated Protein Science Munich (CIPSM) and Department of Chemistry Ludwig-Maximilians-Universität München Butenandtstr. 5–13, Haus D 81377 München Germany
3. Department of Microbiology Institute of Wetland and Water Research Radboud University Nijmegen The Netherlands