NRT1/PTR family (NPF), subfamily 8 of the Major Facilitator Superfamily of transporters
The plant Nitrate transporter/Peptide transporter (NRT1/PTR) family (NPF) is related to the POT (proton-coupled oligopeptide transporter), Peptide transporter (PepT/PTR), or Solute Carrier 15 (SLC15) family in animals. In contrast to related animal and bacterial counterparts, the plant proteins transport a wide variety of substrates including nitrate, peptides, amino acids, dicarboxylates, glucosinolates, as well as the plant hormones indole-3-acetic acid (IAA) and abscisic acid (ABA). A recent study identified eight subfamilies within this family, named NPF1-NPF8. NPF8 contains the Arabidopsis dipeptide transporters AtNPF8.1 (PTR1), AtNPF8.2 (PTR5), and AtNPF8.3 (PTR2), as well as tonoplast-localized transporters AtNPF8.4 (PTR4) and AtNPF8.5 (PTR6). Oryza sativa NRT1 (now called OsNPF8.9) is a low-affinity nitrate transporter. NPF8 belongs to the Major Facilitator Superfamily (MFS) of membrane transport proteins, which are thought to function through a single substrate binding site, alternating-access mechanism involving a rocker-switch type of movement.
Feature 1:putative chemical substrate binding pocket [chemical binding site]
Evidence:
Comment:based on the structures of MFS transporters with bound substrates, substrate analogs, and/or inhibitors
Comment:since MFS proteins facilitate the transport of many different substrates including ions, sugar phosphates, drugs, neurotransmitters, nucleosides, amino acids, and peptides, the residues involved in substrate binding may not be strictly conserved among superfamily members
Comment:the substrate binding site or translocation pore has access to both sides of the membrane in an alternating fashion through a conformational change of the MFS transporter
Comment:NRT1/PTR family proteins transport a wide variety of substrates including nitrate, peptides, amino acids, dicarboxylates, glucosinolates, as well as the plant hormones indole-3-acetic acid (IAA) and abscisic acid (ABA).
Jiyao W et al.(2023). "The conserved domain database in 2023.",