SLC5A6 transports vitamins from extracellular region to cytosol

Stable Identifier
Reaction [transition]
Homo sapiens
Na+-dependent multivitamin transporter
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Biotin (vitamin H or B7) is a water-soluble B-complex vitamin. Biotin is a cofactor in the metabolism of fatty acids and leucine, and it plays a role in gluconeogenesis. D-Pantothoate (vitamin B5), is a water-soluble vitamin needed to form coenzyme-A (CoA), and is critical in the metabolism and synthesis of carbohydrates, proteins, and fats. Lipoic acid is an organosulfur compound, the R-enantiomer of which is an essential cofactor for many enzyme complexes.

The human SLC5A6 encodes the Na+-dependent multivitamin transporter SMVT (Prasad PD et al, 1999; Wang H et al, 1999). SMVT co-transports these vitamins/cofactors into cells with Na+ ions electrogenically. PDZ domain-containing protein 11 (PDZD11 aka AIPP1) is a cytosolic protein with a single PDZ domain which can bind to the C-terminal class 1 PDZ binding motif of SMVT, resulting in a significant induction of vitamin uptake over that with SMVT alone (Nabokina et al. 2011).
Literature References
PubMed ID Title Journal Year
10329687 Human placental Na+-dependent multivitamin transporter. Cloning, functional expression, gene structure, and chromosomal localization.

Wang, H, Leibach, FH, Xia, H, Ganapathy, V, Yang-Feng, TL, Huang, W, Devoe, LD, Prasad, PD, Fei, YJ

J Biol Chem 1999
21183659 Association of PDZ-containing protein PDZD11 with the human sodium-dependent multivitamin transporter

Said, HM, Nabokina, SM, Subramanian, VS

Am. J. Physiol. Gastrointest. Liver Physiol. 2011
10334869 Molecular and functional characterization of the intestinal Na+-dependent multivitamin transporter

Wang, H, Leibach, FH, Ganapathy, V, Huang, W, Devoe, LD, Prasad, PD, Fei, YJ

Arch Biochem Biophys 1999
Catalyst Activity

sodium-dependent multivitamin transmembrane transporter activity of SLC5A6:PDZD11 [plasma membrane]

Orthologous Events
Cross References
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