Three rhamnosyltransferases responsible for assembly of the A-band D-rhamnan polysaccharide in Pseudomonas aeruginosa: a fourth transferase, WbpL, is required for the initiation of both A-band and B-band lipopolysaccharide synthesis.
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WbpX, WbpY and WbpZ are the alpha-D-rhamnosyltransferases that assemble the A-band D-rhamnan.
"The A-band polysaccharide is assembled by the alpha-D-rhamnosyltransferases, WbpX, WbpY and WbpZ."
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wbpX, wbpY and wbpZ mutants make no A-band LPS; B-band is unaffected.
"these mutants are unable to synthesize A-band LPS, while B-band synthesis is unaffected"