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Mol. Cell. Biol., 10 1995, 5396-5402, Vol 15, No. 10
L Li, X Lu, CA Peterson and RJ Legerski
Replication protein A (RPA) is required for simian virus 40-directed DNA
replication in vitro and for nucleotide excision repair (NER). Here we
report that RPA and the human repair protein XPA specifically interact both
in vitro and in vivo. Mapping of the RPA-interactive domains in XPA
revealed that both of the largest subunits of RPA, RPA- 70 and RPA-34,
interact with XPA at distinct sites. A domain involved in mediating the
interaction with RPA-70 was located between XPA residues 153 and 176.
Deletion of highly conserved motifs within this region identified two
mutants that were deficient in binding RPA in vitro and highly defective in
NER both in vitro and in vivo. A second domain mediating the interaction
with RPA-34 was identified within the first 58 residues in XPA. Deletion of
this region, however, only moderately affects the complementing activity of
XPA in vivo. Finally, the XPA-RPA complex is shown to have a greater
affinity for damaged DNA than XPA alone. Taken together, these results
indicate that the interaction between XPA and RPA is required for NER but
that only the interaction with RPA-70 is essential.
Copyright © 1995, American Society for Microbiology
An interaction between the DNA repair factor XPA and replication protein A appears essential for nucleotide excision repair
Department of Molecular Genetics, University of Texas M. D. Anderson Cancer Center, Houston 77030, USA.
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