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Glucose transporters are a wide group of membrane proteins that facilitate the transport of glucose across the plasma membrane, a process known as facilitated diffusion. Because glucose is a vital source of energy for all life, these transporters are present in all phyla .
In addition to SGLT1 and SGLT2, there are 10 other members in the human protein family SLC5A. [4] SLC5A4, also known as SGLT3, is a member of the sodium-glucose cotransporter family. Unlike SGLT1 and SGLT2, which are efficient glucose transporters, SGLT3 functions primarily as a glucose sensor rather than a transporter.
Glucose transporter 1 (or GLUT1), also known as solute carrier family 2, facilitated glucose transporter member 1 (SLC2A1), is a uniporter protein that in humans is encoded by the SLC2A1 gene. [1] GLUT1 facilitates the transport of glucose across the plasma membranes of mammalian cells. [ 2 ]
Glucose transporter type 4 (GLUT4), also known as solute carrier family 2, facilitated glucose transporter member 4, is a protein encoded, in humans, by the SLC2A4 gene. GLUT4 is the insulin -regulated glucose transporter found primarily in adipose tissues and striated muscle (skeletal and cardiac).
Glucose transporters are integral membrane proteins that mediate the transport of glucose and structurally related substances across cellular membranes.Two families of glucose transporter have been identified: the facilitated diffusion glucose transporter family (GLUT family), also known as uniporters, and the sodium-dependent glucose transporter family (SGLT family), also known as ...
A membrane transport protein is a membrane protein involved in the movement of ions, small molecules, and macromolecules, such as another protein, across a biological membrane. Transport proteins are integral transmembrane proteins ; that is they exist permanently within and span the membrane across which they transport substances.
Basal blood glucose level is approximately 5mM (5 millimolar). The Km value (an indicator of the affinity of the transporter protein for glucose molecules; a low Km value suggests a high affinity) of the GLUT1 and GLUT3 proteins is 1mM; therefore GLUT1 and GLUT3 have a high affinity for glucose and uptake from the bloodstream is constant.
GLUT1 deficiency syndrome, also known as GLUT1-DS, De Vivo disease or Glucose transporter type 1 deficiency syndrome, is an autosomal dominant genetic metabolic disorder associated with a deficiency of GLUT1, the protein that transports glucose across the blood brain barrier. [1]
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