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- W1565332914 abstract "Phosphatidylglycerophosphate (PGP) synthase catalyzes a reaction involved in the synthesis of phosphatidylglycerol (PG), which serves as a metabolic precursor for cardiolipin (CL), found primarily in the mitochondrial membranes of eukaryotic cells. We isolated a Chinese hamster ovary cell mutant (designated PGS-S) with a specific lesion in PGP synthase by using an in situ enzymatic assay for the enzyme. This mutant was obtained by introducing a second mutation into mutant PGS-P that had been generated by first-step mutagenesis. The PGP synthase activities in cell extracts of mutant PGS-S grown at 33 and 40 degrees C were 14 and 1% of those in the wild type cells, respectively; in addition, PGP synthase in cell extracts of mutant PGS-S exhibited higher sensitivity to heat than that of the wild type. Mutant PGS-S also showed a temperature-dependent defect in the synthesis of PG and CL in vivo, together with temperature sensitivity for cell growth. A temperature-resistant revertant of mutant PGS-S simultaneously restored PGP synthase activity and the ability to synthesize PG and CL in vivo to nearly the same levels as those of mutant PGS-P. These results constitute genetic evidence that PGP synthase is responsible for PG synthesis and is essential for cell growth." @default.
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- W1565332914 creator A5051685552 @default.
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- W1565332914 date "1993-10-01" @default.
- W1565332914 modified "2023-10-15" @default.
- W1565332914 title "A somatic cell mutant defective in phosphatidylglycerophosphate synthase, with impaired phosphatidylglycerol and cardiolipin biosynthesis." @default.
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- W1565332914 doi "https://doi.org/10.1016/s0021-9258(18)41612-2" @default.
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