Solute carrier organic anion transporter 6 family of the Major Facilitator Superfamily of transporters
The Solute carrier organic anion transporter 6 (SLCO6) or Organic anion transporting polypeptide 6 (OATP6) family contains only one subfamily, OATP6A, which contains only one human member OATP6A1 (encoded by SLCO6A1). The OATP6 family is the most diverged of the OATPs. OATP6A1 is also called cancer/testis antigen 48 (CT48) or gonad-specific transporter. It is strongly expressed only in normal testis, and weakly in spleen, brain, fetal brain, and placenta. It is found in tumor samples (lung, bladder, and esophageal) and cancer cell lines (lung), and may be of potential use as a target for therapy for a variety of tumor types. The SLCO6/OATP6 family belongs to the Solute carrier organic anion transporter [SLCO, also called organic anion transporting polypeptides (OATPs) or Solute carrier family 21] family of the Major Facilitator Superfamily (MFS) of transporters. MFS proteins 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
Jiyao W et al.(2023). "The conserved domain database in 2023.",