Purity ~85% (SDS-PAGE). Essential for the uptake of the murein peptide L-alanyl-gamma-D-glutamyl-meso-diaminopimelate. Also transports some alpha-linked peptides such as Pro-Phe-Lys with low affinity. The transport is effected by the oligopeptide permease system. Source: Recombinant protein corresponding to aa23-537 from E. coli MppA, fused to His-SUMO-Tag at N-terminal, expressed in E. coli. AA