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(A) Metabolism of GlcN and GlcNAc. Both sugars are PTS sugars, so that their transport across the inner membrane (Mb) into the cytoplasm (CP) by the manXYZ- and nagE-encoded transporters results in their phosphorylation. Subsequent metabolism is via the nagA- and nagB-encoded enzymes, GlcNAc6P deacetylase and GlcN6P deaminase, which results in fructose 6-phosphate. (B) Organization of the divergent nagE-BACD operons. The function of nagD is unknown.
