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- W1505628416 abstract "Abstract Tetrahymena cells decreased to half of their normal size during a 24 h starvation period, with a large reduction in total phospholipd content per cell. Upon transferring to the non-nutrient medium, there was a progressive increase in 2-aminoethylphosphonolipid (AEPL) concentration and a corresponding decrease in the phosphatidyletanolamine (PE), present solely in diacyl form, while the level of phosphatidylcholine (PC) fraction remained rather constant. The alkyl-acyl PC and alkyl-acyl and diacyl AEPL showed relatively strong resistance to catabolic attack in a nutrient-free medium, although diacyl types (PC and PE) were reduced drastically. γ-Linolenate, which is a principal fatty acid of starved cells, increased remarkably, with a compensatory decrease in palmitoleate. The hydrolysis with phospholipase A 2 revealed the characteristic segregation of saturated and unsaturated acids between the 1- and 2-position, respectively, of PE, diacyl PC and diacyl AEPL. The increase of pentadecyate at the 1-position and the decrease of palmitoleate at the 2-position were observed in diacyl forms of PE, PC and AEPL. On the other hand, the 2-position of 1- O -alkyl-2-acyl-phosphatidylcholine and 1- O - alkyl -2- acyl -(2- aminoethyl ) phosphonolipid was occupied mainly by γ-linolenate together with cilienate (18 : 2 Δ 6,11 ) and linoleate. γ-Linolenate at the 2-position of 1- O -alkyl-2-acyl-phosphatidylcholine was increased, with a decrease of linoleate, whereas an increase in unusual fatty acid, cilienate and a decrease in linoleate were observed with no alteration of 7-linolenate in 1- O -alkyl-2-acyl-(2-aminoethyl)phosphonolipid under starvation. These results indicate that hexadecyl/18 : 3-PC, saturated/18 : 1-AEPL and hexadecyl/18 : 2 Δ 6, 11 (or 18 : 3)-AEPL, which co either an ether linkage or a C-P bond, would play a crucial role in adaptation to nutrient-free environment in Tetrahymena ." @default.
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- W1505628416 date "1981-10-23" @default.
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- W1505628416 title "Adaptive modification of membrane lipids in Tetrahymena pyriformis during starvation. Alterations in phospholipid composition and positional distribution of fatty acyl chains." @default.
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