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. 1983 Dec;3(12):2172–2179. doi: 10.1128/mcb.3.12.2172

Initiation by RNA polymerase II and formation of runoff transcripts containing unblocked and unmethylated 5' termini.

H Ernst, W Filipowicz, A J Shatkin
PMCID: PMC370088  PMID: 6361523

Abstract

Transcription of cloned adenovirus, beta-globin, and retrovirus long terminal repeat DNAs in HeLa whole-cell lysate was inhibited by S-adenosylhomocysteine. However, full-length 1.7-kilobase transcripts made on adenovirus 2 late promoter DNA contained 5'-terminal GpppA, consistent with specific initiation and runoff synthesis in the absence of product methylation. Formation of runoff transcripts including retrovirus RNAs that normally contain 5'-m7GpppGmpC was not decreased by replacing GTP with non-hydrolyzable analogs, and Rous-associated virus-2 runoff products made in the presence of GTP-gamma-S contained 5'-terminal gamma-S-pppGpC. The results indicate that capping and specific transcript synthesis by RNA polymerase II are not obligatorily linked in HeLa whole-cell lysate. Accurate initiation is dependent on ATP hydrolysis, and in contrast to GTP, replacement of ATP by 5'-adenylyl-imidodiphosphate blocked specific initiation of transcripts that start with either GTP (Rous-associated virus-2, Rous-associated virus-0) or ATP (beta-globin, adenovirus).

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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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