1.3.1.33 protochlorophyllide reductase etioplast prolamellar body - 9541 393833, 393834, 393837, 393842, 393843, 393844, 393845, 393851, 393855, 393857, 393858, 393861, 393866, 654842, 656908, 656982, 700758 1.3.1.33 protochlorophyllide reductase etioplast prolamellar body contains two photochemically active forms of the enzyme: protochlorophyllide oxidoreductase POR-PChlide640 and POR-PChlide650. Resuspension of prolamellar bodies in media with a pH below 6.8 leads to a rapid conversuion of POR-PChlide650 to POR-PChlide 640 and a dramatic reorganization of the membrane system of the prolamellar body. The disappearence of POR-PChlide 650 and the reorganization of the prolamellar body are irreversible 9541 393866 1.3.1.33 protochlorophyllide reductase etioplast prolamellar body peripheral membrane protein 9541 393858 2.1.1.11 magnesium protoporphyrin IX methyltransferase etioplast prolamellar body containing photoactive protochlorophyllide 9541 485111 2.5.1.32 15-cis-phytoene synthase etioplast prolamellar body under certain light conditions, e.g. far-red light, the increase in PSY mRNA and protein levels are not accompanied by an increase in enzymatic activity. Under those conditions the enzyme is localized in the prolamellar body fraction in a mostly enzymatically inactive form 9541 637886 2.5.1.62 chlorophyll synthase etioplast prolamellar body chlorophyll synthetase activity is relocated from transforming prolamellar bodies to developing thylakoids during irradiation of dark-grown Triticum aestivum 9541 639805 2.5.1.62 chlorophyll synthase etioplast prolamellar body enzyme is present in an inactive state 9541 639804