... mblock@cea.frAbbreviations:Ado-met,S-adenosyl-L-methionine; MgPIXMT,S-adenosyl-L-methionine:Mg-protoporphyrin IX methyltransferase;MGDG, monogalactosyldiacylglycerol; MGD, monogalactosyldia-cylglycerol ... M., Masuda, T ., Bando, T., Yamagata, H., Ohta, H.& T akamiya, K. (1998) Cloning and expression of the s oybeanchlH gene encoding a s ubunit of Mg-chelatase an d localization of the M g 2+ concentration-depe ... hylakoids f ractions. The fractionswere analyzed by SDS/PAGE and C oomassie blue staining and MgPIXMT activity was compared to MGDG synthase activity a s a marker o fenvelope me mbranes and...