Escherichia coli single-stranded DNA-binding protein is a supercoiled template-dependent transcriptional activator of N4 virion RNA polymerase.

Abstract:

:Coliphage N4 is a double-stranded DNA virus that requires the sequential activity of three different RNA polymerases during infection. The N4 virion RNA polymerase, which is carried in the virion and is injected with the DNA at the start of infection, is responsible for the synthesis of N4 early RNAs. In vitro, the virion RNA polymerase can transcribe double-stranded N4 DNA accurately and efficiently but only when the DNA is denatured. We have shown previously that the activity of DNA gyrase is required for in vivo early N4 transcription. We report here that Escherichia coli single-stranded DNA-binding protein (SSB) is also required for N4 early transcription. In vitro, linear or relaxed templates cannot be activated by SSB; however, supercoiled template and SSB allow the virion polymerase to recognize its promoters on duplex DNA and activate transcription. The effects of supercoiling are limited to transcript initiation and are not required for transcript elongation. The activation is specific for SSB; no other single-stranded DNA-binding proteins can substitute. Therefore, SSB is one of a small number of proteins that function to stimulate both replication and transcription. The basis for the specificity of SSB, the mechanism of transcriptional activation by SSB and template supercoiling, and their role in the N4 transcriptional program during development are discussed.

journal_name

Genes Dev

journal_title

Genes & development

authors

Markiewicz P,Malone C,Chase JW,Rothman-Denes LB

doi

10.1101/gad.6.10.2010

subject

Has Abstract

pub_date

1992-10-01 00:00:00

pages

2010-9

issue

10

eissn

0890-9369

issn

1549-5477

journal_volume

6

pub_type

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