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Escherichia coli 3-Deoxy-D-manno-octulosonate 8-phosphate(KDO8P) synthase catalyzed the condensation reaction between D-arabinose 5-phosphate(A5P) and phosphoenolpyruvate(PEP) to form KDO8P and inorganic phosphate(Pi). The noncovalent tetrameric associati