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Molecular and Cellular Biology, November 2001, p. 7199-7206, Vol. 21, No. 21
Sealy Center for Molecular Science,
University of Texas Medical Branch, Galveston, Texas
77555-1061,1 and Department of
Molecular Biology and Virology, Memorial Sloan-Kettering Cancer
Center, New York, New York 10021-60072
Received 5 July 2001/Returned for modification 20 July
2001/Accepted 27 July 2001
Human DNA polymerase
0270-7306/01/$04.00+0 DOI: 10.1128/MCB.21.21.7199-7206.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Physical and Functional Interactions of Human DNA
Polymerase
with PCNA
(hPol
) functions in the error-free
replication of UV-damaged DNA, and mutations in hPol
cause
cancer-prone syndrome, the variant form of xeroderma pigmentosum.
However, in spite of its key role in promoting replication through a
variety of distorting DNA lesions, the manner by which hPol
is
targeted to the replication machinery stalled at a lesion site remains unknown. Here, we provide evidence for the physical interaction of
hPol
with proliferating cell nuclear antigen (PCNA) and show that
mutations in the PCNA binding motif of hPol
inactivate this interaction. PCNA, together with replication factor C and replication protein A, stimulates the DNA synthetic activity of hPol
, and steady-state kinetic studies indicate that this stimulation accrues from an increase in the efficiency of nucleotide insertion resulting from a reduction in the apparent
Km for the incoming nucleotide.
*
Corresponding author. Mailing address: Sealy
Center for Molecular Science, University of Texas Medical
Branch, 6.104 Blocker Medical Research Building, 11th and
Mechanic Streets, Galveston, TX 77555-1061. Phone: (409)
747-8602. Fax: (409) 747-8608. E-mail: sprakash{at}scms.utmb.edu.
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