1. Department of Chemistry University of Warwick Coventry CV4 7AL UK
2. Current address: The Centre for Bacterial Cell Biology Biosciences Institute Medical School Newcastle University Newcastle upon Tyne NE2 4AX UK
3. Microbiomes, Microbes and Informatics Group Organisms and Environment Division School of Biosciences Cardiff University Cardiff CF103 AT UK
4. Warwick Integrative Synthetic Biology Centre University of Warwick Coventry CV4 7AL UK
5. Department of Biochemistry and Molecular Biology, ARC Centre of Excellence for Innovations in Peptide and Protein Science Monash University Clayton VIC 3800 Australia