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In Escherichia coli the coenzyme pyridoxal 5'-phosphate issynthesised de novo by a pathway that is thought to involve the condensation of 4-(phosphohydroxy)-L-threonine and 1-deoxy-D-xylulose, catalysed by the enzymes PdxA and PdxJ, to form either pyridoxine (vitamin B6) or pyridoxine 5'-phosphate [1].
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