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. 1988 Oct;85(19):7059–7063. doi: 10.1073/pnas.85.19.7059

Enhanced B2 transcription in simian virus 40-transformed cells is mediated through the formation of RNA polymerase III transcription complexes on previously inactive genes.

M F Carey 1, K Singh 1
PMCID: PMC282123  PMID: 2845394

Abstract

RNA polymerase III (pol III) transcribes the highly repeated murine B2 elements. We showed previously that the B2 RNAs are induced 4-fold in normal growing cells and 20-fold in simian virus 40-transformed cells relative to the levels in normal confluent cells. By employing chromatin as a template in a partially purified pol III transcription system, we now demonstrate that the augmented expression results from the formation of pol III transcription complexes on previously inactive B2 genes. Extracts prepared from normal growing cells and transformed cells transcribed cloned pol III templates 5-fold more efficiently than extracts from normal confluent cells. This increase was attributed to 5-fold greater levels of factor IIIC; the levels of pol III and factor IIIB were the same in all extracts. We discuss how the levels of IIIC and differing accessibility of this factor to repressed B2 genes mediate the formation of pol III transcription complexes in normal growing and transformed 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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