Replication arrest-stimulated recombination: Dependence on the RecA paralog, RadA/Sms and translesion polymerase, DinB.

Replication arrest-stimulated recombination: Dependence on the RecA paralog, RadA/Sms and translesion polymerase, DinB. Research Abstract Details 

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Replication arrest-stimulated recombination: Dependence on the RecA paralog, RadA/Sms and translesion polymerase, DinB. Abstract Text:

Susan T Lovett,

Difficulties in replication can lead to breakage of the fork. Recombinational reactions restore the integrity of the fork through strand-invasion of the broken chromosome with its sister. If this occurs in the context of repeated DNA sequences, genetic rearrangements can result. We have proposed that this process accounts for stimulation of chromosomal rearrangements by mutations in Escherichia coli's replicative DNA helicase, DnaB. At its permissive temperature for growth, a dnaB107 mutant is a 1000-fold more likely to experience a deletion of a 787bp tandem repeated segment inserted in the E. coli chromosome than is a wild-type strain. We have previously shown that enhanced deletion in a dnaB107 strain is reduced in recA, recB and recG102 (formerly known as radC102) derivatives. Here I show that this enhanced recombination is dependent on other factors: the RuvA Holliday junction helicase, the RecJ single-strand DNA exonuclease, the RadA/Sms RecA-paralog protein of unknown function and, surprisingly, the DinB translesion polymerase. The requirement for these factors in DnaB-stimulated rearrangements is much greater than that observed for recombinational events such as P1 transduction. This may be because strand invasion into the repeats limits the extent of heteroduplex DNA that can be formed in the initial stage of recombination. I propose that RadA, RecG and RuvAB are critically required to stabilize the strand-invasion intermediate and that DinB polymerase extends the invading 3' strand to aid in re-initiation. The role of DinB in bacteria may be analogous to translesion DNA polymerase eta in eukaryotes, recently shown to aid recombination.

Replication arrest-stimulated recombination: Dependence on the RecA paralog, RadA/Sms and translesion polymerase, DinB. Publishing Authors By Initials

ST Lovett,

For similar investigative techniques: genetic techniques: gene transfer techniques: transduction, genetic research abstracts see: investigative techniques: genetic techniques: gene transfer techniques: transduction, genetic research

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Replication arrest-stimulated recombination: Dependence on the RecA paralog, RadA/Sms and translesion polymerase, DinB. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: DNA repair

VOLUME: 5

Page Numbers: 1421-7

Journal Abbreviation: DNA Repair (Amst.)

ISSN: 1568-7864

DAY: 9

MONTH: 08

YEAR: 2006

Replication arrest-stimulated recombination: Dependence on the RecA paralog, RadA/Sms and translesion polymerase, DinB. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 101139138

Replication arrest-stimulated recombination: Dependence on the RecA paralog, RadA/Sms and translesion polymerase, DinB. Keywords Mesh Terms:

KEYWORDS: Transduction, Genetic

MESH TERMS: physiology

Chemical & Substance for Abstract: Replication arrest-stimulated recombination: Dependence on the RecA paralog, RadA/Sms and translesion polymerase, DinB. Information

Substance Name: DnaB Helicases

Registry Number: EC 3.1.-

Grant and Affiliation Information for Replication arrest-stimulated recombination: Dependence on the RecA paralog, RadA/Sms and translesion polymerase, DinB.

AFFILIATION: Department of Biology and Rosenstiel Basic Medical Sciences Research Center, Brandeis University, Waltham, MA 02454-9110, USA. Lovett@brandeis.edu

Country: Netherlands

AGENCY: United States NIGMS

GRANT: GM51753

ACRONYM: GM

MEDLINETA: DNA Repair (Amst)

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