PMID: 9159142May 27, 1997Paper

SOS factors involved in translesion synthesis

Proceedings of the National Academy of Sciences of the United States of America
R L NapolitanoR P Fuchs

Abstract

Mutations are permanent DNA sequence changes that can be induced when replication occurs on a damaged DNA template. In Escherichia coli, the process of translesion synthesis past a lesion that hinders replication requires the induction of SOS-controlled gene products, among which are those of the umuDC operon. To study translesion synthesis in vivo, we have constructed single-stranded vectors containing single 2-acetylaminofluorene adducts located within -1 and -2 frameshift mutation hot spots formed by short repetitive sequences. These adducts strongly hinder DNA replication as only 2-5% of the molecules give rise to progeny under non-SOS-induced conditions. Induction of the SOS response lead to a 10-fold increase in survival. Adducts present within repetitive sequences trigger the formation of misaligned primer/template replication intermediates which, upon elongation, will result in the fixation of frameshift errors (mutagenic translesion synthesis). Surprisingly we find that elongation from the nonslipped intermediate depends upon functional umuDC+ gene products, whereas elongation from the slipped intermediate is umuDC+ independent but requires another, as yet biochemically uncharacterized, SOS function. These data are dis...Continue Reading

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Citations

Nov 11, 1999·Mutation Research·A M Cordonnier, R P Fuchs
Feb 13, 1999·Molecular Microbiology·M Z Humayun
Jul 12, 2002·The EMBO Journal·Anne Bresson, Robert P P Fuchs
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Apr 30, 1998·Genetics·B T Smith, G C Walker

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