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- W88603552 abstract "The surface are of cottonseed glyoxysomes increases about 4 fold within 36 h after imbibition. Membrane phospholipid must become available to glyoxysomes to accommodate expansion. Incubation of cotyledons (18-h-old) in 14C-choline (1 h) resulted in at least 85% recovery of 14C-phosphatidylcholine (PC) in membranes comigrating on sucrose gradients (20-59% w/w) with antimycin A-insensitive cytochrome c reductase (CCR) activity and choline- and ethanolaminephosphotransferase (CPT and EPT) activities (ER at about 24% w/w sucrose). Chase experiments with 3.4 M choline chloride for 2, 12, or 24 h led to increasing proportions of 14C-PC (36% after 24 h) recovery in mitochondria. No transfer of 14C-PC to enlarging glyoxysomes was detected. Incubations in 14C-ethanolamine yielded ER labeling after only 30 min. 14C-PE chased into mitochondria membranes more rapidly than PC (45% after 12 h), and no 14C-PE chased into glyoxysome membranes. Evidence for synthesis of 14C-PC from 14C-PE was found after 12 h chase with 1 M ethanolamine hydrochloride. Our results indicate that ER is the primary site of PC and PE synthesis in vivo and that ER contributes newly synthesized PC and PE to mitochondrial membranes but not to expanding glyoxysomal membranes. This is different from membrane biogenesis of glyoxysomes proliferating in castormore » bean endosperm.« less" @default.
- W88603552 created "2016-06-24" @default.
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- W88603552 date "1990-05-01" @default.
- W88603552 modified "2023-09-28" @default.
- W88603552 title "In vivo phospholipid biosynthesis in cotton cotyledons during glyoxysome enlargement" @default.
- W88603552 hasPublicationYear "1990" @default.
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