The proton-dependent oligopeptide transporter (POT) family (also known as the peptide transport (PTR) family) is made up of a group of energy-dependent transporters found in a organisms as diverse as bacteria and humans. The POT family of proteins is distinct from the ABC-type peptide transporters and was uncovered by sequence analyses of peptide transport proteins [1]. They seem to be mainly involved in the intake of small peptides [2]. However, some family members are nitrate permeases and others are involved in histidine transport [3].

1. The PTR family: a new group of peptide transporters. Mol. Microbiol. 16, 825-34
2. The POT family of transport proteins. Trends Biochem. Sci. 19, 404
3. Nitrate transporters and peptide transporters. FEBS Lett. 581, 2290-300

The proton-dependent oligopeptide transporter (POT) family (also known as the peptide transport
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