Na(+)/iodide (NIS) and Na(+)/multivitamin (SMVT) cotransporters, and related proteins; solute binding domain
NIS (encoded by the SLC5A5 gene) transports I-, and other anions including ClO4-, SCN-, and Br-. SMVT (encoded by the SLC5A6 gene) transports biotin, pantothenic acid and lipoate. This subfamily also includes SMCT1 and -2. SMCT1(encoded by the SLC5A8 gene) is a high-affinity transporter of various monocarboxylates including lactate and pyruvate, short-chain fatty acids, ketone bodies, nicotinate and its structural analogs, pyroglutamate, benzoate and its derivatives, and iodide. SMCT2 (encoded by the SLC5A12 gene) is a low-affinity transporter for short-chain fatty acids, lactate, pyruvate, and nicotinate. This subgroup belongs to the solute carrier 5 (SLC5) transporter family.
Comment:based on the structures of Vibrio parahaemolyticus vSGLT (SLC5), Aquifex aeolicus LeuT (SLC6), and the NCS1, Microbacterium liquefaciens Mhp1, bound with Na+, functional studies of Escherichia coli PutP (SLC5) and mammalian NIS (SLC5), and mutational analysis of vSGLT
Comment:one of two Na+ binding sites in Aquifex aeolicus LeuT, where it is referred to as the Na binding site 2
Jiyao W et al.(2023). "The conserved domain database in 2023.",