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J. Biol. Chem., Vol. 277, Issue 34, 31115-31123, August 23, 2002
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and
Proliferating Cell Nuclear Antigen*
,
,
,
, and
From the Proliferating cell nuclear antigen (PCNA) plays
an essential role in nucleic acid metabolism as a component of the DNA
replication and DNA repair machinery. As such, PCNA interacts with many
proteins that have a sequence motif termed the PCNA
interacting motif (PIM) and also with proteins
lacking a PIM. Three regions in human and rat DNA polymerases
Laboratory of Structural Biology, NIEHS,
National Institutes of Health,
Research Triangle Park, North Carolina 27709
(
-pol) that resemble the consensus PIM were identified, and we show
here that
-polymerase and PCNA can form a complex both in
vitro and in vivo. Immunoprecipitation experiments,
yeast two-hybrid analysis, and overlay binding assays were used to
examine the interaction between the two proteins. Competition
experiments with synthetic PIM-containing peptides suggested the
importance of a PIM in the interaction, and studies of a
-polymerase
PIM mutant, H222A/F223A, demonstrated that this alteration blocked the
interaction with PCNA. The results indicate that at least one of the
PIM-like sequences in
-polymerase appears to be a functional PIM and
was required in the interaction between
-polymerase and
PCNA.
To whom correspondence should be addressed: NIEHS, National
Institutes of Health, 111 T.W. Alexander Dr., Research Triangle Park,
NC 27709. Tel.: 919-541-3267; Fax: 919-541-3592; E-mail: wilson5@niehs.nih.gov.
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