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DNA polymerase beta bypasses in vitro a single d(GpG)-cisplatin adduct placed on codon 13 of the HRAS gene.


Hoffmann, J S; Pillaire, M J; Maga, G; Podust, V N; Hübscher, U; Villani, G (1995). DNA polymerase beta bypasses in vitro a single d(GpG)-cisplatin adduct placed on codon 13 of the HRAS gene. Proceedings of the National Academy of Sciences of the United States of America (PNAS), 92(12):5356-5360.

Abstract

We have examined the capacity of calf thymus DNA polymerases alpha, beta, delta, and epsilon to perform in vitro translesion synthesis on a substrate containing a single d(GpG)-cisplatin adduct placed on codon 13 of the human HRAS gene. We found that DNA synthesis catalyzed by DNA polymerases alpha, delta, and epsilon was blocked at the base preceding the lesion. Addition of proliferating cell nuclear antigen to DNA polymerase delta and replication protein A to DNA polymerase alpha did not restore their capacity to elongate past the adduct. On the other hand, DNA polymerase beta efficiently bypassed the cisplatin adduct. Furthermore, we observed that DNA polymerase beta was the only polymerase capable of primer extension of a 3'-OH located opposite the base preceding the lesion. Likewise, DNA polymerase beta was able to elongate the arrested replication products of the other three DNA polymerases, thus showing its capacity to successfully compete with polymerases alpha, delta, and epsilon in the stalled replication complex. Our data suggest (i) a possible mechanism enabling DNA polymerase beta to bypass a d(GpG)-cisplatin adduct in vitro and (ii) a role for this enzyme in processing DNA damage in vivo.

We have examined the capacity of calf thymus DNA polymerases alpha, beta, delta, and epsilon to perform in vitro translesion synthesis on a substrate containing a single d(GpG)-cisplatin adduct placed on codon 13 of the human HRAS gene. We found that DNA synthesis catalyzed by DNA polymerases alpha, delta, and epsilon was blocked at the base preceding the lesion. Addition of proliferating cell nuclear antigen to DNA polymerase delta and replication protein A to DNA polymerase alpha did not restore their capacity to elongate past the adduct. On the other hand, DNA polymerase beta efficiently bypassed the cisplatin adduct. Furthermore, we observed that DNA polymerase beta was the only polymerase capable of primer extension of a 3'-OH located opposite the base preceding the lesion. Likewise, DNA polymerase beta was able to elongate the arrested replication products of the other three DNA polymerases, thus showing its capacity to successfully compete with polymerases alpha, delta, and epsilon in the stalled replication complex. Our data suggest (i) a possible mechanism enabling DNA polymerase beta to bypass a d(GpG)-cisplatin adduct in vitro and (ii) a role for this enzyme in processing DNA damage in vivo.

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Additional indexing

Item Type:Journal Article, refereed
Communities & Collections:05 Vetsuisse Faculty > Institute of Veterinary Biochemistry and Molecular Biology
Dewey Decimal Classification:570 Life sciences; biology
Language:English
Date:6 June 1995
Deposited On:11 Feb 2008 12:18
Last Modified:05 Apr 2016 12:16
Publisher:National Academy of Sciences
ISSN:0027-8424
Publisher DOI:10.1073/pnas.92.12.5356
Related URLs:http://www.pubmedcentral.nih.gov/picrender.fcgi?artid=41693&blobtype=pdf
PubMed ID:7777511
Permanent URL: http://doi.org/10.5167/uzh-831

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