Major facilitator superfamily domain-containing protein 1
Human major facilitator superfamily domain-containing protein 1 (MFSD1) is also called smooth muscle cell-associated protein 4 (SMAP-4). The function of MFSD1 is still unknown. Its expression is affected by altered nutrient intake. During starvation, expression of MFSD1 is downregulated in anterior brain sections in mice while it is upregulated in the brainstem. In mice raised on high-fat diet, MFSD1 is specifically downregulated in brainstem and hypothalamus. MFSD1 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
Jiyao W et al.(2023). "The conserved domain database in 2023.",