NAGA and infection: Intriguingly, Mtb lacks the genetic machinery for phosphotransferase systems, and given the genomic organization of nagA, it is tantalizing to link the functional role of the Mtb SugI transporter to the import of phosphorylated carbohydrates, which subsequently acts in concert with the deactylase NagA enzyme to recycle and optimize the use of restricted carbohydrates during intracellular infection.