pyridoxal

The 4-aldehyde of pyridoxine, having a similar physiologic action. SEE ALSO: pyridoxine.

- p. kinase an enzyme that catalyzes the phosphorylation by ATP of p. to p. 5-phosphate and ADP, thus converting the nutrient to the active coenzyme.

- p. 5-phosphate (PLP) a coenzyme essential to many reactions in tissue, notably transaminations and amino acid decarboxylations.

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pyr·i·dox·al .pir-ə-'däk-.sal n a crystalline aldehyde C₈H₉NO₃ of the vitamin B₆ group that in the form of its phosphate is active as a coenzyme

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pyr·i·dox·al (pir″ĭ-dokґsəl) one of the forms of vitamin B_{6> (q.v.).}