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Pyridoxal phosphate (PLP, pyridoxal 5'-phosphate, P5P), the active form of vitamin B 6, is a coenzyme in a variety of enzymatic reactions. The International Union of Biochemistry and Molecular Biology has catalogued more than 140 PLP-dependent activities, corresponding to ~4% of all classified activities. [ 5 ]
Vitamin B 6 Drug class Pyridoxal 5'-phosphate, the metabolically active form of vitamin B 6 Class identifiers Use Vitamin B 6 deficiency ATC code A11H Biological target enzyme cofactor Clinical data Drugs.com International Drug Names External links MeSH D025101 Legal status In Wikidata Vitamin B 6 is one of the B vitamins, and is an essential nutrient for humans. The term essential nutrient ...
Pyridoxal 5′-phosphate synthase (glutamine hydrolysing) (EC 4.3.3.6, PdxST) is an enzyme with systematic name D-ribose 5-phosphate,D-glyceraldehyde 3-phosphate ...
The enzyme pyridoxal phosphatase [1] [2] [3] (EC 3.1.3.74) catalyzes the reaction pyridoxal 5′-phosphate + H 2 O ⇌ {\displaystyle \rightleftharpoons } pyridoxal + phosphate This enzyme belongs to the family of hydrolases , specifically those acting on phosphoric monoester bonds.
Pyridoxine 5′-phosphate oxidase is an enzyme, encoded by the PNPO gene, [1] [2] [3] that catalyzes several reactions in the vitamin B 6 metabolism pathway. Pyridoxine 5′-phosphate oxidase catalyzes the final, rate-limiting step in vitamin B 6 metabolism, the biosynthesis of pyridoxal 5′-phosphate, the biologically active form of vitamin B 6 which acts as an essential cofactor. [4]
Pyridoxal kinase is an enzyme that in humans is encoded by the PDXK gene. [5] [6] The protein encoded by this gene phosphorylates vitamin B 6, a step required for the conversion of vitamin B 6 to pyridoxal-5-phosphate, an important cofactor in intermediary metabolism. The encoded protein is cytoplasmic and probably acts as a homodimer.
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