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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 .
GLUT4 has a Km value for glucose of about 5 mM, which as stated above is the normal blood glucose level in healthy individuals. GLUT4 is the most abundant glucose transporter in skeletal muscle and is thus considered to be rate limiting for glucose uptake and metabolism in resting muscles. [8]
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 ]
The sodium-glucose linked transporters (SGLTs) are responsible for the active transport of glucose across cell membranes. SGLT1 and SGLT2 are the most well-studied members of this family. [ 1 ] [ 2 ] Both SGLT1 and SGLT2 function as symporters , utilizing the energy from the sodium gradient created by the Na+/K+ ATPase to transport glucose ...
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 ...
SGLT2 is a member of the sodium glucose cotransporter family, which are sodium-dependent glucose transport proteins. SGLT2 is the major cotransporter involved in glucose reabsorption in the kidney. [6] SGLT2 is located in the early proximal tubule, and is responsible for reabsorption of 80-90% of the glucose filtered by the kidney glomerulus. [7]
The glucose transporter GLUT1 is produced by most cell types and is of particular importance for nerve cells and pancreatic β-cells. [79] GLUT3 is highly expressed in nerve cells. [79] Glucose from the bloodstream is taken up by GLUT4 from muscle cells (of the skeletal muscle [82] and heart muscle) and fat cells. [83]
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).