1. Department of Biochemistry and Molecular Biology, University of Melbourne, Parkville, Victoria 3010, Australia
2. Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, Victoria 3010, Australia
3. School of Biological Sciences, University of Canterbury, Christchurch 8140, New Zealand
4. School of Chemistry, University of Melbourne, Parkville, Victoria 3010, Australia
5. Centre for Structural Biology, Institute of Fundamental Sciences, Massey University, Palmerston North 4442, New Zealand