Components of GDP

The rare 6-deoxysugard-rhamnose is a component of bacterial cell sur-face glycans, including the d-rhamnose homopolymer produced by Pseu-domonas aeruginosa, called A-band O polysaccharide. GDP-d-rhamnose synthesis from GDP-d-mannose is catalyzed by two enzymes. The first is a GDP-d-mannose-4,6-dehydratase (GMD). The second enzyme, RMD, reduces the GMD product (GDP-6-deoxy-d-lyxo-hexos-4-ulose) to GDP-d-rhamnose.

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