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PMID: 345092 Published · ppublish English Journal Article

Regional replication of the bacterial chromosome induced by derepression of prophage lambda. III. Role of the replication in escape synthesis of gal operon.

Molecular & general genetics : MGG ·Vol. 159 ·No. 2 ·1978-02-16 ·Pages 185-90

Fukasawa T, Obonai K

Abstract

Recent evidence suggests that the escape synthesis of gal operon following derepression of the prophage lambda in Escherichia coli K12 involves transcription originating at the lambda promoter (PL) to extend through gal under the conditions in which lambda DNA replication is prevented. Whether the observed expression of gal is due to transcription initiating at PL or at the bacterial promoter for gal (Pgal) was examined in the case of lambda DNA replication being normal. The experiments are based on that two types of transcription are distinguished from each other by the following properties: 1. Pgal-promoted transcription is inhibited by chloramphenicol, while PL-promoted transcription is not. 2. PL-promoted transcription suppresses the polar effect caused by nonsense mutation in a bacterial gene, while Pgal-promoted transcription does not do so. -he results have suggested that gal escape synthesis in lambda-induced lysogen results from transcription which initiates not only at PL but also at Pgal. The Pgal-promoted transcription may be a consequence, direct or indirect, of the concomitant replication of gal DNA.

MeSH Terms
Chloramphenicol/pharmacology Coliphages/genetics DNA Replication DNA, Bacterial/metabolism DNA, Viral Escherichia coli/genetics Galactose/genetics,metabolism Transcription, Genetic
Chemicals
DNA, Bacterial DNA, Viral Chloramphenicol Galactose
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Fukasawa T
Obonai K
References (31)
31 references, click to expand
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Article Info
Journal
Molecular & general genetics : MGG
Abbr.
Mol Gen Genet
ISSN
0026-8925
DOI
10.1007/BF00270892
Published
1978-02-16
Pages
185-90
Language
English
Region
Germany
NLM ID
0125036
Subset
IM
External Links
PubMed source DOI: 10.1007/BF00270892
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