The structure of nisin A showing the location of the N-terminal domain, containing one lanthionine and two (β-methyl) lanthionine rings (A, B, and C) linked to the C-terminal intertwined rings (D and E) by a flexible hinge region. Post-translational modifications are highlighted as follows: dehydroalanine (Dha); dehydrobutyrine (Dhb); lanthionine (A-S-A) and (β-methyl) lanthionine (Abu-S-A). Standard residues are represented in the single letter code. Arrow indicates location of the methionine to valine substitution (M21V) in nisin V.
Campion et al. BMC Microbiology 2013 13:23 doi:10.1186/1471-2180-13-23