Compensating Stereochemical Changes Allow Murein Tripeptide to Be Accommodated in a Conventional Peptide-binding Protein.
Maqbool, A., Levdikov, V.M., Blagova, E.V., Herve, M., Horler, R.S., Wilkinson, A.J., Thomas, G.H.(2011) J Biol Chem 286: 31512-31521
- PubMed: 21705338 
- DOI: 10.1074/jbc.M111.267179
- Primary Citation of Related Structures:  
3O9P - PubMed Abstract: 
The oligopeptide permease (Opp) of Escherichia coli is an ATP-binding cassette transporter that uses the substrate-binding protein (SBP) OppA to bind peptides and deliver them to the membrane components (OppBCDF) for transport. OppA binds conventional peptides 2-5 residues in length regardless of their sequence, but does not facilitate transport of the cell wall component murein tripeptide (Mtp, L-Ala-γ-D-Glu-meso-Dap), which contains a D-amino acid and a γ-peptide linkage ...