Effect of single DNA lesions on in vitro replication with DNA polymerase III holoenzyme. Comparison with other polymerases.

Abstract:

:In the present work, we have studied in vitro replication of N-2-acetylaminofluorene (AAF) or cis-diamminedichloroplatinum II (cis-DDP) single modified DNA templates. We used the holoenzyme (pol III HE) or the alpha subunit of DNA polymerase III, which is involved in SOS mutagenesis, and other DNA polymerases in order to compare enzymes having different biological roles and properties. Single-stranded oligonucleotides (63-mer) bearing a single AAF adduct at one of the different guanine residues of the NarI sequence (-G1G2CG3CC-) have been used in primer extension assays. Site-specifically platinated 5'd(ApG) or 5'd(GpG) oligonucleotides were constructed and similarly used in primer extension assays. In all cases, irrespective of both the chemical nature of the lesion (i.e. AAF or cis-DDP) and its local sequence context (i.e. the 3 different sites for AAF adducts within the NarI site) replication by pol III HE and pol I Klenow fragment (pol I Kf) stops one base prior to the adduct site. Removal of the 3'-->5' proofreading activity alone was not sufficient to trigger bypass of DNA lesions. Indeed, when proofreading activity of pol I is inactivated by a point mutation (pol I Kf (exo-)), the major replication product corresponds to the position opposite the adduct site showing that incorporation across from the AAF adduct is possible. These results suggest that a polymerase with proofreading activity is actually found to stop one nucleotide before the adduct not because it is unable to insert a nucleotide opposite the adduct but most likely because elongation past the adduct is strongly impaired, giving thus an increased time frame for the proofreading exonuclease to remove the base inserted across from the adduct. These results are discussed in terms of their implications for error-free and error-prone bypass in vivo.

journal_name

J Mol Biol

authors

Belguise-Valladier P,Maki H,Sekiguchi M,Fuchs RP

doi

10.1006/jmbi.1994.1125

subject

Has Abstract

pub_date

1994-02-11 00:00:00

pages

151-64

issue

1

eissn

0022-2836

issn

1089-8638

pii

S0022-2836(84)71125-9

journal_volume

236

pub_type

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