Topoisomerases and yeast rRNA transcription: negative supercoiling stimulates initiation and topoisomerase activity is required for elongation.

Abstract:

:Previous work has shown that rRNA synthesis is strongly inhibited in yeast top1-top2 double mutants. Here, we show that inactivation of yeast topoisomerases can have paradoxical effects on transcription by RNA polymerase I. For example, transcription of ribosomal minigenes on extrachromosomal plasmids is greatly stimulated in top1-top2 cells while accumulation of full-length endogenous rRNA is strongly inhibited. We present evidence for a mechanism that can partly account for these opposing effects on transcription. On the one hand, transcription initiation can be stimulated owing to an accumulation of negative superhelicity because polymerase I prefers to initiate on negatively supercoiled templates. Conversely, synthesis of full-length rRNA is inhibited owing to the fact that chain elongation requires a DNA relaxing activity.

journal_name

Genes Dev

journal_title

Genes & development

authors

Schultz MC,Brill SJ,Ju Q,Sternglanz R,Reeder RH

doi

10.1101/gad.6.7.1332

subject

Has Abstract

pub_date

1992-07-01 00:00:00

pages

1332-41

issue

7

eissn

0890-9369

issn

1549-5477

journal_volume

6

pub_type

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