Niacin Vitamin B3 and Nicotinamide Adenine Dinucleotide Phosphate NADP

1 Niacin (Vitamin B3) and Nicotinamide Adenine Dinucleotide Phosphate (NADP ) 

The role of a pyridinium ion and a 1 -dihydropyridine in enzyme-catalysed oxidation and reduction processes 

The vitamin is transformed into pyridoxal phosphate (PLP), which, as a pyridine, is basic at the ring nitrogen, and in the active form, is V-protonated. Enzymes containing PLP have various functions, all connected with amino acids. Amongst other activities, PLP-containing enzymes can (i) effect transfer of an amino group from an a-amino acid to an a-keto acid (ii) bring about decarboxylation of an a-amino acid or 

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