Disease:May be involved in atopic dermatitis (AD) . ,Function:May act as a GTPase-activating protein for RAB2A , RAB8A , RAB10 and RAB14. Isoform 2 promotes insulin-induced glucose transporter SLC2A4/GLUT4 translocation at the plasma membrane , thus increasing glucose uptake. ,PTM:Insulin-stimulated phosphorylation is required for SLC2A4/GLUT4 translocation. ,PTM:Phosphorylated by AKT1; insulin-induced. ,PTM:Physiological hyperinsulinemia increases phosphorylation in skeletal muscle. Insulin-stimulated phosphorylation is reduced by 39% in type 2 diabetic patients. ,similarity:Contains 1 Rab-GAP TBC domain. ,similarity:Contains 2 PID domains. ,subcellular location:Isoform 2 shows a cytoplasmic perinuclear localization in a myoblastic cell line in resting and insulin-stimulated cells. ,tissue specificity:Widely expressed , but differential expression for isoforms 1 and 2 , with highest overall expression of isoform 2 in most tissues. Isoform 1 is highly expressed in skeletal muscle and heart , but was not detectable in the liver nor in adipose tissue. Isoform 2 strongly expressed in adrenal and thyroid gland , and also in lung , kidney , colon , brain and adipose tissue. Moderate isoform 2 expression in skeletal muscle. Expressed in pancreatic Langerhans islets , including beta cells (at protein level) . Expression is decreased by twofold in pancreatic islets in type 2 diabetes patients compared to control subjects. ,
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