Download MendeleyNMR Shows Why a Small Chemical Change Almost Abolishes the Antimicrobial Activity of Glycocin F.
Harjes, E., Edwards, P.J.B., Bisset, S.W., Patchett, M.L., Jameson, G.B., Yang, S.H., Navo, C.D., Harris, P.W.R., Brimble, M.A., Norris, G.E.(2023) Biochemistry 62: 2669-2676
- PubMed: 37531216
- DOI: https://doi.org/10.1021/acs.biochem.3c00197
- Primary Citation of Related Structures:
8DFZ - PubMed Abstract:
Glycocin F (GccF), a ribosomally synthesized, post-translationally modified peptide secreted by Lactobacillus plantarum KW30, rapidly inhibits the growth of susceptible bacteria at nanomolar concentrations. Previous studies have highlighted structural features important for its activity and have shown the absolute requirement for the Ser18 O -linked GlcNAc on the eight-residue loop linking the two short helices of the (C-X6-C) 2 structure. Here, we show that an ostensibly very small chemical modification to Ser18, the substitution of the C α proton with a methyl group, reduces the antimicrobial activity of GccF 1000-fold (IC 50 1.5 μM cf . 1.5 nM). A comparison of the GccF α-methylSer18 NMR structure (PDB 8DFZ) with that of the native protein (PDB 2KUY) showed a marked difference in the orientation and mobility of the loop, as well as a markedly different positioning of the GlcNAc, suggesting that loop conformation, dynamics, and glycan presentation play an important role in the interaction of GccF with as yet unknown but essential physiological target molecules.
Organizational Affiliation:
School of Natural Sciences, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand.
