What is "aminolevulinic acid"

n. (context organic compound English) Any amino derivative of levulinic acid, but especially ''5-aminolevulinic acid'' which is an intermediate in the biosynthesis of porphyrin

δ-Aminolevulinic acid (dALA or δ-ALA or 5ala or 5-aminolevulinic acid ) is the first compound in the porphyrin synthesis pathway, the pathway that leads to heme in mammals and chlorophyll in plants.

In plants, production of δ-ALA is the step on which the speed of synthesis of chlorophyll is regulated. Plants that are fed by external δ-ALA accumulate toxic amounts of chlorophyll precursor, protochlorophyllide, indicating that the synthesis of this intermediate is not suppressed anywhere downwards in the chain of reaction. Protochlorophyllide is a strong photosensitizer in plants.