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• W1587788294 abstract "We devised an in situ assay method for the activity of serine palmitoyltransferase (SPT) that catalyzes the first step in sphingolipid biosynthesis and isolated a temperature-sensitive mutant of Chinese hamster ovary cells with thermolabile SPT. This mutant stopped growing at 40 degrees C after several generations, although the cells grew at 33 and 37 degrees C at rates similar to those of the parent. The SPT activity in cell homogenates of the mutant grown at low temperatures was 4-8% of that in the parent homogenates. When the cells were cultured for several generations at 40 degrees C, the activity in the mutant homogenate became negligible. When cell homogenates were incubated at 45 degrees C before enzyme assay, mutant SPT was more markedly inactivated than parental SPT, indicating that mutant SPT had become thermolabile. The rates of de novo synthesis of sphingolipids in the mutant were much slower at 40 degrees C than at lower temperatures, in contrast to those in the parent. The sphingomyelin content in the mutant cultivated at 40 degrees C for several generations was also less than that at low temperatures. These results indicate that SPT functions in the main pathway for sphingolipid biosynthesis. The temperature-sensitive growth of the mutant defective in sphingolipid synthesis suggests that sphingolipid(s) plays an essential role in cell growth." @default.
• W1587788294 created "2016-06-24" @default.
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• W1587788294 date "1990-12-01" @default.
• W1587788294 modified "2023-09-29" @default.
• W1587788294 title "A temperature-sensitive mammalian cell mutant with thermolabile serine palmitoyltransferase for the sphingolipid biosynthesis." @default.
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• W1587788294 doi "https://doi.org/10.1016/s0021-9258(18)45681-5" @default.
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