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J. Biol. Chem., Vol. 277, Issue 50, 48434-48440, December 13, 2002
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Functionally and Physically Interacts
with Proliferating Cell Nuclear Antigen in Normal and Translesion
DNA Synthesis*
§,
,
**,
,
,
, and
From the Proliferating cell nuclear antigen (PCNA) has
been shown to interact with a variety of DNA polymerases (pol) such as
pol
Istituto di Genetica Molecolare-Consiglio
Nazionale delle Ricerche, Via Abbiategrasso 207, I-27100 Pavia, Italy, the ¶ Institut de Pharmacology et de
Biologie Structurale, Centre National de la Recherche Scientifique, 205 Route de Narbonne, 31077 Toulouse Cedex, France, the
Institute of Veterinary Biochemistry and Molecular Biology,
University of Zürich-Irchel, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland, the ** Department of
Molecular and Radiation Biophysics, Petersburg Nuclear Physics
Institute, Leningrad District, Gatchina 188300, Russia, and the

Centro di Biologia Molecular Severo Ochoa,
Consejo Superior de Investigaciones Cientificas-Universitad Autonoma,
Madrid 29089, Spain
, pol
, pol
, pol
, pol
, and pol
. Here we show
that PCNA directly interacts with the newly discovered pol
cloned
from human cells. This interaction stabilizes the binding of pol
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
. PCNA was found to stimulate efficient synthesis by pol
across an abasic (AP) site. When compared with pol
, human pol
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
but not by pol
. 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
. Our results suggest that the complex between PCNA and pol
may play an important role in the bypass of
abasic sites in human cells.
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