Alpha-ketoglutarate permease of the Major Facilitator Superfamily of transporters
This subfamily includes Escherichia coli alpha-ketoglutarate permease (KgtP) and similar proteins. KgtP is a constitutively expressed proton symporter that functions in the uptake of alpha-ketoglutarate across the boundary membrane. Also included is a putative transporter from Pseudomonas aeruginosa named dicarboxylic acid transporter PcaT. The KgtP subfamily belongs to the Metazoan Synaptic Vesicle Glycoprotein 2 (SV2) and related small molecule transporter family (SV2-like) of the Major Facilitator Superfamily (MFS) of membrane transport proteins. 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.",