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Treatment of rats with thiamphenicol in a dose of 125 mg/kg per day for 60–64 h causes specific inhibition of mitochondrial protein synthesis, leading to a drastic decrease of the cytochrome c oxidase activity in intestinal epithelium. At the same time the mitochondrial ATPase activity becomes resistant to inhibition by oligomycin. Experiments with isolated intestinal mitochondria revealed that respiration in state 3 is diminished by 55% with succinate (5 mM) and by 40% with pyruvate (10 mM) plus L-malate (2 mM) as the substrates, both as compared to intestinal mitochondria isolated from control rats. P : O ratios as well as respiratory control indices are comparable in the two groups of animals. Uncoupled respiration is inhibited by 35% with succinate as the substrate, while the succinate cytochrome c reductase activity remains unaltered. No inhibition of uncoupled respiration with pyruvate plus L-malate as the substrates was observed. The ATP-Pi exchange activity in the mitochondria from the treated animals is diminished by about 75%. It is concluded that in the mitochondria of the treated animals the inhibition of the coupled respiration (state 3) is caused by the limitation of the ATP-generating capacity and that electron transport is rate limiting only with the rapidly oxidized substrates such as succinate, if respiration is uncoupled. 相似文献
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E De Clercq A Billiau V G Edy K L Kirk L A Cohen 《Biochemical and biophysical research communications》1978,82(3):840-846
2-Fluoro-L-Histidine inhibits protein synthesis in various cell cultures, as measured by 3H-leucine incorporation. This histidine analog also inhibits the cytopathogenicity of a number of RNA and DNA viruses in primary and continuous cell cultures; it blocks the transformation of normal mouse (MO) cells by murine sarcoma virus, and partially suppresses the release of murine leukemia virus by a continuously infected mouse cell line (JLSV5). In human skin fibroblasts, it reduces the interferon-inducing capacity of poly(I)·poly(C). Inhibition of cell protein synthesis may be the common cause of the various effects. 4-Fluoro-L-histidine is essentially inert in all of the test systems examined. 相似文献
997.
Incubation of rabbit kidney microsomes with pig pancreatic phospholipase A2 produced residual membrane preparations with very low activity. The activity could be restored by recombination with lipid vesicles of negatively-charged glycerophospholipids. Vesicles of pure phosphatidylcholine and phosphatidylethanolamine were virtually inactive in this respect, but could reactivate in the presence of cholate.Incubation of the microsomes with a combination of phospholipase C (Bacillus cereus) and sphingomyelinase C (Staphylococcus aureus) resulted in 90–95% release of the phospholipids. The residual membrane contained only phosphatidylinositol and still showed 50–100% of the activity. 相似文献
998.
Translation of mouse interferon mRNA in Xenopus laevis oocytes and in rabbit reticulocyte lysates 总被引:5,自引:0,他引:5
B Lebleu E Hubert J Content L De Wit I A Braude E De Clercq 《Biochemical and biophysical research communications》1978,82(2):665-673
Mouse interferon mRNA, extracted from NDV (Newcastle disease virus)-induced L-929 cells has been translated with high efficiency in oocytes and rabbit reticulocyte lysates. The translational efficiency of a crude RNA extract was 10 640 interferon units/mg RNA/hour for the oocytes and 4 012 interferon units/mg RNA/hour for the reticulocyte lysates. The translation product fulfilled the usual criteria for mouse interferon, species specificity and neutralization by specific anti-mouse interferon antiserum. Upon injection of crude interferon mRNA into oocytes, interferon activity appeared both in the oocyte homogenates and the oocyte incubation medium. When analyzed by velocity sedimentation in formamidesucrose, the mouse interferon mRNA showed a rather sharp peak halfway between the 4 S and 18 S RNA markers, as could be expected from a mRNA which codes for a 20,000 dalton protein. 相似文献
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