Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-809
Maga, G; Villani, G; Ramadan, K; Shevelev, I V; Tanguy Le Gac, N; Blanco, L; Blanca, G; Spadari, S; Hübscher, U (2002). Human DNA polymerase lambda functionally and physically interacts with proliferating cell nuclear antigen in normal and translesion DNA synthesis. Journal of Biological Chemistry, 277(50):48434-48440.
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Proliferating cell nuclear antigen (PCNA) has been shown to interact with a variety of DNA polymerases (pol) such as pol delta, pol epsilon, pol iota, pol kappa, pol eta, and pol beta. Here we show that PCNA directly interacts with the newly discovered pol lambda cloned from human cells. This interaction stabilizes the binding of pol lambda to the primer template, thus increasing its affinity for the hydroxyl primer and its processivity in DNA synthesis. However, no effect of PCNA was detected on the rate of nucleotide incorporation or discrimination efficiency by pol lambda. PCNA was found to stimulate efficient synthesis by pol lambda across an abasic (AP) site. When compared with pol delta, human pol lambda showed the ability to incorporate a nucleotide in front of the lesion. Addition of PCNA led to efficient elongation past the AP site by pol lambda but not by pol delta. However, when tested on a template containing a bulky DNA lesion, such as the major cisplatin Pt-d(GpG) adduct, PCNA could not allow translesion synthesis by pol lambda. Our results suggest that the complex between PCNA and pol lambda may play an important role in the bypass of abasic sites in human cells.
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|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:||13 December 2002|
|Deposited On:||11 Feb 2008 12:18|
|Last Modified:||27 Nov 2013 17:00|
|Publisher:||American Society for Biochemistry and Molecular Biology|
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