1. School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, Victoria 3010, Australia
2. York Structural Biology Laboratory, Department of Chemistry, University of York, Heslington YO10 5DD, UK
3. Chemical Biology Division, The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3010, Australia
4. Department of Medical Biology, University of Melbourne, Parkville, Victoria 3010, Australia