TBC1D4

This gene is a member of the Tre-2/BUB2/CDC16 domain family. The protein encoded by this gene is a Rab-GTPase-activating protein, and contains two phopshotyrosine-binding domains (PTB1 and PTB2), a calmodulin-binding domain (CBD), a Rab-GTPase domain, and multiple AKT phosphomotifs. This protein is thought to play an important role in glucose homeostasis by regulating the insulin-dependent trafficking of the glucose transporter 4 (GLUT4), important for removing glucose from the bloodstream into skeletal muscle and fat tissues. Reduced expression of this gene results in an increase in GLUT4 levels at the plasma membrane, suggesting that this protein is important in intracellular retention of GLUT4 under basal conditions. When exposed to insulin, this protein is phosphorylated, dissociates from GLUT4 vesicles, resulting in increased GLUT4 at the cell surface, and enhanced glucose transport. Phosphorylation of this protein by AKT is required for proper translocation of GLUT4 to the cell surface. Individuals homozygous for a mutation in this gene are at higher risk for type 2 diabetes and have higher levels of circulating glucose and insulin levels after glucose ingestion. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Aug 2015]

Description

TBC1 domain family member 4

Tissue specificity

Tissue enhanced (skeletal muscle)

Subcell location

Cytosol

Predicted location

Intracellular

Protein family

Disease related genes
Mapped to neXtProt
Mapped to UniProt SWISS-PROT
Potential drug targets
Predicted intracellular proteins
Protein evidence (Ezkurdia et al 2014)
Protein evidence (Kim et al 2014)
Transporters

Chromosome

13 (75283503 - 75482169)

Ensembl ID

ENSG00000136111  (ver. 103.38)

Orthologs

Mouse Tbc1d4: ENSMUSG00000033083

UniProt

O60343

neXtProt

NX_O60343

Human splice variants
Mouse splice variants

Protein structure