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Plant Physiology 52:50-53 (1973)
© 1973 American Society of Plant Biologists

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Enzymes of Phospholipid Metabolism in the Endoplasmic Reticulum of Castor Bean Endosperm 1

T. S. Moore, J. M. Lord2, T. Kagawa3 and Harry Beevers

a Thimann Laboratories, University of California, Santa Cruz, California 95060

The intracellular location of several enzymes concerned with phospholipid metabolism was investigated by examining their distribution in organelles separated on sucrose gradients from total homogenates of castor bean (Ricinus communis var. Hale) endosperm. The enzymes phosphatidic acid phosphatase, CDP-diglyceride-inositol transferase, and phosphatidyletha-nolamine-L-serine phosphatidyl transferase were all primarily or exclusively confined to membranes of the endoplasmic reticulum. These results and those reported previously on lecithin synthesis establish a major role of the endoplasmic reticulum in phospholipid and membrane synthesis in plant tissues.

2 Present address: Department of Biochemistry, The University, Leicester, England.

3 Present address: C.S.I.R.O., Division of Plant Industry, Canberra, Australia.

1 This work was supported by the Atomic Energy Commission Contract AT-1 04/3, National Science Foundation Grant GB-24961, and United States Public Health Services Postdoctoral Fellowship 1-F2-AM-51, 665-01 to T.M.




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R. Douce
Site of Biosynthesis of Galactolipids in Spinach Chloroplasts
Science, March 1, 1974; 183(4127): 852 - 853.
[Abstract] [PDF]


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Copyright © 1973 by the American Society of Plant Biologists