SLC5As, NAGLT1 cotransport Glc and Na+ from extracellular region to cytosol

Stable Identifier
R-HSA-429613
Type
Reaction [transition]
Species
Homo sapiens
Compartment
Synonyms
Co-transport (influx) of glucose and Na+ ions by SLC5As, NAGLT1
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The human gene SLC5A2 encodes a sodium-dependent glucose transporter, SGLT2 (Wells et al. 1992). SLC5A2 is expressed in many tissues but primarily in the kidney, specifically the renal proximal tubules (S1 and S2 segments). It is a low affinity, high capacity transporter of glucose across the apical membrane, with co-transport of Na+ ions in a 1:1 ratio. Unlike SGLT1, it doesn't transport galactose. SLC5A2 is the main transporter of glucose in the kidney, responsible for approximately 98% of glucose reabsorption (remainder by SGLT1). Defects in SLC5A2 are the cause of renal glucosuria (GLYS1), an autosomal recessive renal tubular disorder (Calado et al. 2004). A separate sodium dependent glucose transporter NAGLT1, was identified in the multifacilitator superfamily (MFS) and could be a transporter of glucose in kidney proximal tubules. Its rat orthologue, Naglt1, has been shown to mediate tubular reabsorption of glucose (Horiba et al. 2003). By similarity, SLC5A1, 4 and 9 are predicted proteins that transport glucose in a Na+-dependent manner.

Literature References
PubMed ID Title Journal Year
12590146 Cloning and characterization of a novel Na+-dependent glucose transporter (NaGLT1) in rat kidney

Horiba, N, Masuda, S, Takeuchi, A, Takeuchi, D, Okuda, M, Inui, K

J. Biol. Chem. 2003
1415574 Cloning of a human kidney cDNA with similarity to the sodium-glucose cotransporter

Wells, RG, Pajor, AM, Kanai, Y, Turk, E, Wright, EM, Hediger, MA

Am J Physiol 1992
14614622 Novel compound heterozygous mutations in SLC5A2 are responsible for autosomal recessive renal glucosuria

Calado, J, Soto, K, Clemente, C, Correia, P, Rueff, J

Hum Genet 2004
Participants
Participant Of
Catalyst Activity
Catalyst Activity
Title
glucose:sodium symporter activity of SLC5As, NAGLT1 [plasma membrane]
Physical Entity
Activity
Orthologous Events
Authored
Reviewed
Created
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