Solute carrier organic anion transporter 1A subfamily of the Major Facilitator Superfamily of transporters
The Solute carrier organic anion transporter 1A (SLCO1A), also called Organic anion-transporting polypeptide 1A (OATP1A), subfamily is composed of one human member OATP1A2 (encoded by SLCO1A2) and several rodent proteins encoded by the Slco1a1, Slco1a3, Slco1a4, Slco1a5, and Slco1a6 genes. OATP1A2, also known as human OATP-A or OATP1, shows a broad spectrum of substrates including endogenous compounds (such as bile acids, steroid hormones and their conjugates, thyroid hormones) and various drugs (such as fexofenadine, ouabain and the cyanobacterial toxin microcystin). It is expressed in the brain, kidney, intestine, liver, lung, testes, and the eye (ciliary body). The SLCO1A/OATP1A subfamily 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.",