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Biomedical subjects

B Lebleu

Publications and source records attributed to B Lebleu.

At least 109 records · Page 6Linked to original sources
PubMed1974

Role of the polyadenylate segment in the translation of globin messenger RNA in Xenopus oocytes.

The translations of native messenger RNA for rabbit globin and that of poly(A)-free globin messenger RNA have been compared after injection into Xenopus oocytes. The initial rate of translation of poly(A)-free mRNA is close to that found with intact mRNA. However, at longer incubation periods, the rate of globin synthesis with poly(A)-free mRNA is considerably lower than with native mRNA. Similar differences in the template activity of the two mRNA preparations were found with a cell-free extract of Krebs II ascites tumor. It is concluded that the presence of the 3' poly(A)-rich sequence in mRNA is required to ensure high functional stability.

Adenine Nucleotides↗
PubMed1973

Discrimination between messenger ribonucleic acids by a mammalian translation initiation factor.

A factor from rabbit-reticulocyte ribosome, which stimulates by 5-fold initiation of hemoglobin mRNA translation in Krebs ascites cell extracts, was purified to homogeneity. The factor, a protein of about 65,000 molecular weight in sodium dodecyl sulfate, discriminates between various mRNAs: it stimulates translation of alpha globin mRNA and of tobacco mosaic virus RNA, but has only a small effect on beta globin mRNA and no effect at all on Mengo virus RNA translation.

Animals↗
PubMed1973

Correlation between the antiviral effect of interferon treatment and the inhibition of in vitro mRNA translation in noninfected L cells.

When noninfected L-cell suspension cultures are treated with interferon (specific activities superior to 10(6) reference units per mg of protein), the cell-free cytoplasmic extracts obtained are inactive for the translation of exogenous natural mRNAs. The dose-response curve shows that comparable amounts of interferon are required to produce a 50% reduction of Mengo virus multiplication in vivo and Mengo RNA translation in vitro. With higher doses of interferon, Mengo RNA translation is completely abolished, while poly U translation and endogenous protein synthesis are only slightly affected. The inactivation of Mengo RNA translation is reversible; after removal of interferon, normal translation activity is regained together with the ability to support Mengo virus multiplication. Fractionation of the cell-free extracts shows that the effect is localized in the fraction which can be washed off the ribosomes by high salt. These results establish that interferon induces a block in genetic translation in noninfected L cells.

Animals↗