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The chlorophyll biosynthesis is one of the most important pathways in chloroplast and its first and rate-limiting step is catalyzed by Mg chelatase.Mg chelatase is a heterotrimeric enzyme consisting of three subunits: CHLH,CHLI and CHLD subunits.Each of the subunits is necessary for Mg chelatase activity [1] and modulated by regulatory proteins.