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Biosynthetic pathway of PNP to the coenzyme PLP and the salvage pathway of PLP in E. coli. PNP is synthesized by the deoxyxylulose 5-phosphate (DXP)-dependent pathway. It is subsequently oxidized by PNP/PMP oxidase (PdxH) to produce PLP. PLP is recycled through a salvage pathway involving pyridoxal kinase (PdxK and PdxY), pyridoxal phosphatase (YbhA), and PdxH. The putative reactions in this pathway are represented by broken arrows.
