Ami transporter system, Wide range, Structural analysis, Invasive infections, Energy balance, Silico modelling, Unexpected remarkable promiscuity, Cell surface, Multiple crystallographic structures, Mass spectrometry analysis, Ensure sufficient uptake, Uptake mechanism, Becomes indispensable, Structural basis, Shedding light, div >< p, Escherichia coli, Oligopeptide binding, Abc transporters, Diverse peptide specificities, Closed conformations along, Cellular cytoplasm, Streptococcus pneumoniae </, >, displaying affinity, Auxotrophic nature, Oligopeptides demonstrates, Substantial array, div &gt;&lt; p, Streptococcus pneumoniae, Produced de novo, Oligopeptide recognition, Transport systems, Escherichia coli </, Pneumococci, Binding cassette, Abc transporter channel, Certain amino acids, &gt;, displaying affinity, Four proteins building, Vivo implications, Orchestrating oligopeptide uptake