A test of 'polymerase handover' as a mechanism for stimulating initiation by RNA polymerase I.

Abstract:

:On the tandemly linked ribosomal genes of Xenopus laevis, the RNA polymerase transcribes past the 3' end of the 40S coding region and terminates at T3 just upstream of the gene promoter. The close proximity of T3 to the gene promoter, and the functional interdependence of these two elements, has led to the suggestion that polymerase terminating at T3 might be passed directly to the gene promoter. Such a mechanism might be necessary to maintain the characteristic high rate of transcription initiation seen on the ribosomal genes. We have performed a direct test of this model by introducing chain-terminating psoralen adducts into a circular plasmid containing a single gene promoter with its attendant T3 region upstream. We find that the psoralen adducts can completely prevent polymerase from traveling around the template circle (and thus prevent polymerase from approaching the promoter from upstream) without affecting the rate of transcription initiation at the gene promoter. This result suggests that recycling of polymerase from T3 to the promoter is not a significant mechanism in maintaining high initiation rates.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Lucchini R,Reeder RH

doi

10.1093/nar/17.1.373

subject

Has Abstract

pub_date

1989-01-11 00:00:00

pages

373-87

issue

1

eissn

0305-1048

issn

1362-4962

journal_volume

17

pub_type

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