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The assembly of the phosphoglyceride-linked form of enterobacterial common antigen (ECA(PG)) occurs by a mechanism that involves modulation of polysaccharide chain length. However, the genetic determinant of this modulation has not been identified. Site-directed mutagenesis of o349 of the Escherichia coli K-12 wec gene cluster revealed that this locus encodes a Wzz protein that specifically modulates the chain length of ECA(PG) polysaccharides, and we have designated this locus wzz(ECA). The Wzz(ECA)-mediated modulation of ECA(PG) polysaccharide chains is the first demonstrated example of Wzz regulation involving a polysaccharide that is not linked to the core-lipid A structure of lipopolysaccharide.

journal of bacteriology

The Modality of Enterobacterial Common Antigen Polysaccharide Chain Lengths Is Regulated by o349 of the wec Gene Cluster of Escherichia coli K-12