Creatine transporter protein (CRT or CreaT)

The creatine transporter protein (CRT, also called CreaT, SLC6A8) is a plasma membrane transporter highly expressed in tissues with high energy demands, such as brain, heart, and skeletal muscle[1][4][5][6][7]. It belongs to the solute carrier family 6 (SLC6) of Na+/Cl--dependent neurotransmitter transporters, related to GABA and norepinephrine transporters[1][4][5]. CRT is required for cellular accumulation of creatine, a key metabolite for rapid ATP regeneration. CRT activity is essential for normal brain function, and mutations in the SLC6A8 gene lead to X-linked creatine transporter deficiency, associated with severe neurodevelopmental disorders, intellectual disability, and epilepsy[5][3][4]. CRT can exist in multiple conformational and glycosylation states, and its function and regulation involve ion gradients, phosphorylation state, and protein–protein interactions. Although creatine supplementation is widely used to boost energy metabolism, it is ineffective in CRT deficiency due to defective transporter function, making this protein a validated but pharmacologically challenging therapeutic target[6][5][3][4][7].

Other names

Creatine transporter 1SLC6A8CRT1CreaTSolute carrier family 6 member 8CRT

Facilitated diffusion (Na+/Cl--dependent symport) of creatine into cells; some experimental approaches use pharmacological chaperones to rescue misfolded transporter in genetic deficiency.