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PMID: 796676 Published · ppublish English Journal Article

REPLICAtion of small plasmids in extracts of Escherichia coli: requirement for both DNA polymerases I and II.

Molecular & general genetics : MGG ·Vol. 149 ·No. 2 ·1976-12-08 ·Pages 151-8

Staudenbauer WL

Abstract

The role of the three E. coli DNA polymerases (pol I, II, and III) in the replication of Col E1 DNA and other small plasmids with similar replicative properties was investigated in a soluble in vitro system prepared by freeze-thaw lysis of chloramphenicol-treated cells (Staudenbauer, 1976). Extracts from isogenic mutants of the polA, polB and polC gene loci deficient in pol I, II, and III respectively were examined for their replicative capacity. It was found that polA and polC extracts are deficient in the synthesis of supercoiled plasmid DNA, whereas the polB mutation has not effect. Deficient extracts could be complemented by addition of purified pol I and pol III holoenzyme. Analysis of the in vitro synthesized DNA by alkaline gradient centrifugation indicates that pol I is involved in an early step of the replication cycle whereas pol III is required at a later stage. These conclusions are confirmed by inhibition studies employing arabionsylcytosine triphosphate (aCTP) which is shown to interfere with pol III as well as pol II. The strong inhibitory effect of aCTP on plasmid replication is not influenced by the polB mutation and mimicks the effects of thermal inactivation of polC extracts. It is suggested that aCTP blocks plasmid ENA replication in vitro by interfering with pol III function

MeSH Terms
Cytarabine/pharmacology DNA Polymerase I/metabolism DNA Polymerase II/metabolism DNA Replication DNA-Directed DNA Polymerase/metabolism Escherichia coli/enzymology Extrachromosomal Inheritance Hot Temperature In Vitro Techniques Mutation Plasmids Vidarabine/pharmacology
Chemicals
Cytarabine DNA Polymerase I DNA Polymerase II DNA-Directed DNA Polymerase Vidarabine
Authors & Affiliations
1 authors, click to expand affiliations / ORCID
Staudenbauer W L
References (48)
48 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/BF00332883
Published
1976-12-08
Pages
151-8
Language
English
Region
Germany
NLM ID
0125036
Subset
IM
External Links
PubMed source DOI: 10.1007/BF00332883
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