4.A.1.1.20
The N-acetylglucosamine PTS transporter/kinase, NagE2 (416 aas; IIC)/NagF (77 aas; IIB).  The IIA specific for glucose (Crr) is the IIA for this system, and activity depends on Enzyme I and HPr (Nothaft et al. 2010). The genes encoding these enzymes are regulated by two transcription factors, DasR and AtrA, and the system serves as a sensor as well as a transporter/kinase (Nothaft et al. 2010).