منابع مشابه
Spherosomes of Castor Bean Endosperm: MEMBRANE COMPONENTS, FORMATION, AND DEGRADATION.
The membrane components of the castor bean spherosomes were characterized. The storage triacylglycerols of isolated spherosomes were extracted with diethyl ether, and the membrane was isolated by sucrose gradient centrifugation. It had an apparent equilibrium density of 1.12 grams per cubic centimeter, and possessed an antimycin A-insensitive NADH cytochrome c reductase and an acid lipase. Phos...
متن کاملProteases and Peptidases of Castor Bean Endosperm
The endosperm of castor bean seeds (Rkinus comunuis L.) contains two -SH-dependent amptidases, one hydrolyzing L-leucine-,Bnaphthylamide optimally at pH 7.0, and the other hydrolyzing L-proline,B-naphthylamide optimally at pH 7.5. After germination the endosprm contains in addition an -SH-dependent hemoglobin protease, a serinedependent carboxypeptidase, and at least two -SH-dependent enzymes h...
متن کاملPhosphatidylethanolamine synthesis in castor bean endosperm.
Phosphatidylethanolamine synthesis by CDP-ethanolamine:1,2-diacylglycerol ethanolaminephosphotransferase (EC 2.7.8.1) from the endoplasmic reticulum of castor bean (Ricinus communis L. var. Hale) endosperm was characterized. The Michaelis-Menten constant of the enzyme for CDP-ethanolamine was approximately 8.0 micromolar. The pH optimum was 6.5 and a divalent cation was an absolute requirement ...
متن کاملPhosphatidylcholine synthesis in castor bean endosperm.
Three pathways for phosphatidylcholine synthesis were assayed in castor bean (Ricinus communis var. Hale) endosperm. Phosphatidylethanolamine: S-adenosylmethionine methyl transferase occurred predominantly in the endoplasmic reticulum fraction, but some activity appeared in the mitochondria. Phosphorylcholine glyceride transferase occurred exclusively in the endoplasmic reticulum. The phosphory...
متن کاملPhosphatidylserine synthesis in castor bean endosperm.
Phosphatidylserine synthesis by the endoplasmic reticulum fraction isolated from castor bean (Ricinus communis var. Hale) endosperm was assayed by measuring the incorporation of (14)C-l-serine into chloroform-soluble material. Both phosphatidylserine and phosphatidylethanolamine were identified as products. The incorporation required calcium ions and showed an optimum pH of 7.8 in 2 mm CaCl(2)....
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ژورنال
عنوان ژورنال: Plant Physiology
سال: 1980
ISSN: 0032-0889,1532-2548
DOI: 10.1104/pp.65.6.1176