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Regulation of Magnesium Chelatase Activity during Excessive Accumulation of Porphyrins in Green Barley Leaves
Authors:Yaronskaya  E B  Rassadina  V V  Averina  N G
Institution:(1) Institute of Photobiology, National Academy of Sciences of Belarus, Akademicheskaya ul. 27, Minsk, 220072, Belarus
Abstract:Activity of magnesium chelatase was studied in green barley leaves treated with 5-aminolevulinic acid (ALA). After this treatment, leaves accumulated excessive amounts of porphyrinic precursors of chlorophyll : protoporphyrin IX (PP), magnesium-protoporphyrin IX (MgPP), its monomethyl ester (MgPPE), and protochlorophyllide. The enzyme activity was found to be inversely dependent on the amount of MgPP formed from exogenous ALA. A conclusion was drawn about the existence of a mechanism for the regulation of the enzyme activity in vivo via its inhibition by the reaction product.
Keywords:Hordeum vulgare  magnesium chelatase  5-aminolevulinic acid  protoporphyrin IX  magnesium-protoporphyrin IX  protochlorophyllide
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