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Reactions catalyzed by PLK/HMPPK‐like enzymes. Pyridoxal kinase (PLK) activity phosphorylates pyridoxal using ATP as the phosphoryl donor to form pyridoxal phosphate, the active form of vitamin B6. While hydroxymethyl pyrimidine kinase (HMPK) activity also uses ATP to phosphorylate HMP, producing HMP‐P, an intermediate of vitamin B1 synthesis
