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. 1988 Feb;8(2):747–753. doi: 10.1128/mcb.8.2.747

Effects of single-base substitutions within the Acanthamoeba castellanii rRNA promoter on transcription and on binding of transcription initiation factor and RNA polymerase I.

P Kownin 1, E Bateman 1, M R Paule 1
PMCID: PMC363200  PMID: 3352603

Abstract

Single-point mutations were introduced into the promoter region of the Acanthamoeba castellanii rRNA gene by chemical mutagen treatment of a single-stranded clone in vitro, followed by reverse transcription and cloning of the altered fragment. The promoter mutants were tested for transcription initiation factor (TIF) binding by a template commitment assay plus DNase I footprinting and for transcription by an in vitro runoff assay. Point mutations within the previously identified TIF interaction region (between -20 and -47, motifs A and B) indicated that TIF interacts most strongly with a sequence centered at -29 and less tightly with sequences upstream and downstream. Some alterations of the base sequence closer to the transcription start site (and outside the TIF-protected site) also significantly decreased specific RNA synthesis in vitro. These were within the region which is protected from DNase I digestion by polymerase I, but these mutations did not detectably affect the binding of polymerase to the promoter.

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Selected References

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