FIG. 1.

X. campestris pv. campestris N-acetylglucosamine (GlcNAc) utilization pathway. (A) Organization of genes in the proposed GlcNAc utilization pathway. NagR boxes are indicated by filled circles, and the NagQ box is indicated by an open circle. (B) GlcNAc is proposed to be transported through the outer membrane by TBDTs and then transported across the inner membrane by the MFS transporter NagP. GlcNAc would then be phosphorylated by nagK-II-encoded enzymes. Subsequent metabolism via the nagA-encoded (GlcNAc-6P deacetylase) and nagB-II-encoded (GlcN-6P deaminase) enzymes results in fructose 6-phosphate (Fru-6P) (48). MFS, major facilitator superfamily; PP, periplasm; TBDT, TonB-dependent transporter.