Function
Cation-independent electroneutral transporter (not associated with membrane depolarization) of a variety of tricarboxylic and dicarboxylic acid-cycle intermediates. There is also small, but detectable, transport of monocarboxylics. Transport is through the epithelium of the gut and across the plasma membranes of organs involved in intermediary metabolism and storage. Affinity for substrates is citrate > succinate > pyruvate. Fumarate, a-ketoglutarate, and glutarate are also transported, but not lactate. Transport mechanism that is not coupled to Na(+), K(+), or Cl(-). Function is shown in Xenopus oocytes and human retinal pigment epithelial (HRPE) cell lines.
Sequence
MATETTKMIYTPPPLDIKMEIEIGEQPQPPVKCSNFFANHWKGLVVFLVPLLCLPVMLLNEGAEFRCMYLLLVMAIFWVTEALPLYVTSMIPIVAFPIMGIMSSDQTCRLYFKDTLVMFMGGIMVALAVEYCNLHKRLALRVIQIVGCSPRRLHFGLIMVTMFLSMWISNAACTAMMCPIIQAVLEELQAQGVCKINHEPQYQIVGGNKKNNEDEPPYPTKITLCYYLGIAYASSLGGCGTIIGTATNLTFKGIYEARFKNSTEQMDFPTFMFYSVPSMLVYTLLTFVFLQWHFMGLWRPKSKEAQEVQRGREGADVAKKVIDQRYKDLGPMSIHEIQVMILFIFMVVMYFTRKPGIFLGWADLLNSKDIRNSMPTIFVVVMCFMLPANYAFLRYCTRRGGPVPTGPTPSLITWKFIQTKVPWGLVFLLGGGFALAEGSKQSGMAKLIGNALIGLKVLPNSVLLLVVILVAVFLTAFSSNVAIANIIIPVLAEMSLAIEIHPLYLILPAGLACSMAFHLPVSTPPNALVAGYANIRTKDMAIAGIGPTIITIITLFVFCQTWGLVVYPNLNSFPEWAQIYAAAALGNKTH