Most mammalian cells transport glucose through a family of membrane proteins known as glucose transporters. Molecular cloning of these glucose transporters has identified a family of closely related genes that encodes at least 7 proteins (Glut-1- Glut-14, Mol. Wt. 40-80kD) and Sodium glucose co-transporter- 1 (SGLT-1, 662aa; ~75kD). Individual member of this family have identical predicted secondary structures with 12 transmembrane domains. Both N and c-termini are predicted to be cytoplasmic. Most differences in sequence homology exist within the four hydrophilic domains that may play a role in tissue-specific targeting. Human Glut-2 (GTR2, 524aa, chromosome 3q26.1-q26.3, ~60kD) belongs to the family of solute carrier family 2, member 2 or Slc2a2 or facilitative glucose transporter. Glut-2 likely mediates the bidirectional transfer of glucose across the plasma membrane of hepatocytes and is responsible for uptake of glucose by the beta cells; May also participate with the Na(+)/glucose cotransporter in the transcellular transport of glucose in the small intestine and kidney. It is a multi-pass membrane protein. Primarily expressed in liver, insulin-producing beta cell, small intestine and kidney. Defects in SLC2A2 are the cause of Fanconi-Bickel syndrome (FBS, a rare, autosomal recessive mode and characterized by hepatorenal glycogen accumulation, and impaired utilization of glucose and galactose. Belongs to the major facilitator superfamily. Sugar transporter (TC 2.A.1.1).
Intended for research use only. Not for use in human, therapeutic, or diagnostic applications.