This fungal NCS1 subfamily includes various Saccharomyces cerevisiae transporters: nicotinamide riboside transporter 1 (Nrt1p, also called Thi71p), Dal4p (allantoin permease), Fui1p (uridine permease), Fur4p (uracil permease), and Thi7p (thiamine transporter). NCS1s are essential components of salvage pathways for nucleobases and related metabolites. NCS1s belong to a superfamily which also contains the solute carrier 5 family sodium/glucose transporters, and solute carrier 6 family neurotransmitter transporters.
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