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. 1976 May;18(2):401–410. doi: 10.1128/jvi.18.2.401-410.1976

RNA metabolism of murine leukemia virus. III. Identification and quantitation of endogenous virus-specific mRNA in the uninfected BALB/c cell line JLS-V9.

H Fan, N Mueller-Lantzsch
PMCID: PMC515564  PMID: 178886

Abstract

mRNA containing type C endogenous virus-specific sequences was indentified in JLS-V9 cells (an uninfected BALB/c-derived cell line) by annealing extracted RNA with 3H-labeled virus-specific DNA. The criterion for virus-specific RNA being mRNA was that it co-sedimented with polyribosomes in a sucrose gradient and that it changed to lower sedimentation value if polyribosomes were disagregated prior to centrifugation. It was not possible to identify virus-specific mRNA in unfractionated cytoplasm from JLS-V9 cells since large amounts of virus-specific ribonucleoprotein which was not mRNA had sedimentation values similar to polyribosomes and obscured the analysis. Virus-specific mRNA could be readily identified in polyribosomes which had been purified through a step gradient of 1 and 2 M sucrose, and consisted of two species with sedimentation values of 38S and 27S. The amount of virus-specific RNA in different JLS-V9 cell fractions was quantitated in comparison to cell fractions obtained from M-MuLV clone no. 1 cells (a line of NIH 3T3 cells producing Moloney murine leukemia virus). Approximately 40% of the total virus-specific mRNA was recovered in the purified polyribosomes in M-MuLV no. 1 cells. The amount of virus-specific RNA on polyribosomes appeared to be quite similar for JLS-V9 cells and M-MuLV clone no.1 cells .In contrast, the level of virus-specific protein in JLS-V9 cells (as monitored by radioimmunoassay of the internal structural protein p30) was less than 2% the level in the M-MuLV clone no. 1 cells.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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