NCIt definition : The active form of vitamin B6 and a coenzyme for many pyridoxal phosphate (PLP)-dependent
enzymes. PLP is involved in numerous enzymatic transamination, decarboxylation and
deamination reactions; it is necessary for the synthesis of amino acids and amino
acid metabolites, and for the synthesis and/or catabolism of certain neurotransmitters,
including the conversion of glutamate into gamma-aminobutyric acid (GABA) and levodopa
into dopamine. PLP can be used as a dietary supplement in cases of vitamin B6 deficiency.
Reduced levels of PLP in the brain can cause neurological dysfunction.;