Major facilitator superfamily domain-containing 14A and 14B
This subfamily is composed of major facilitator superfamily domain-containing 14A (MFSD14A) and MFSD14B, and similar proteins. MFSD14A and MFSD14B are also called hippocampus abundant transcript 1 protein (HIAT1) and hippocampus abundant transcript-like protein 1 (HIATL1), respectively. They are both ubiquitously expressed with HIAT1 highly expressed intestis and HIATL1 most abundantly expressed in skeletal muscle. Gene disruption of MFSD14A causes globozoospermia and infertility in male mice. It has bee suggested that MFSD14A may transport a solute from the bloodstream that is required for spermiogenesis. The function of MFSD14B is unknown. The MFSD14 subfamily belongs to the Eukaryotic Solute carrier 46 (SLC46)/Bacterial Tetracycline resistance (TetA) -like (SLC46/TetA-like) 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.",