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Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-824

Mossi, R; Ferrari, E; Hübscher, U (1998). DNA ligase I selectively affects DNA synthesis by DNA polymerases delta and epsilon suggesting differential functions in DNA replication and repair. Journal of Biological Chemistry, 273(23):14322-14330.

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The joining of single-stranded breaks in double-stranded DNA is an essential step in many important processes such as DNA replication, DNA repair, and genetic recombination. Several data implicate a role for DNA ligase I in DNA replication, probably coordinated by the action of other enzymes and proteins. Since both DNA polymerases delta and epsilon show multiple functions in different DNA transactions, we investigated the effect of DNA ligase I on various DNA synthesis events catalyzed by these two essential DNA polymerases. DNA ligase I inhibited replication factor C-independent DNA synthesis by polymerase delta. Our results suggest that the inhibition may be due to DNA ligase I interaction with proliferating cell nuclear antigen (PCNA) and not to a direct interaction with the DNA polymerase delta itself. Strand displacement activity by DNA polymerase delta was also affected by DNA ligase I. The DNA polymerase delta holoenzyme (composed of DNA polymerase delta, PCNA, and replication factor C) was inhibited in the same way as the DNA polymerase delta core, strengthening the hypothesis of a PCNA interaction. Contrary to DNA polymerase delta, DNA synthesis by DNA polymerase epsilon was stimulated by DNA ligase I in a PCNA-dependent manner. We conclude that DNA ligase I displays different influences on the two multipotent DNA polymerases delta and epsilon through PCNA. This might be of importance in the selective involvement in DNA transactions such as DNA replication and various mechanisms of DNA repair.


27 citations in Web of Science®
23 citations in Scopus®
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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
Date:5 June 1998
Deposited On:11 Feb 2008 12:18
Last Modified:05 Apr 2016 12:16
Publisher:American Society for Biochemistry and Molecular Biology
Publisher DOI:10.1074/jbc.273.23.14322
PubMed ID:9603940

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