Characterization of a cDNA encoding the 70-kDa single-stranded DNA-binding subunit of human replication protein A and the role of the protein in DNA replication - PubMed (original) (raw)
. 1991 Jun 25;266(18):12090-8.
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- PMID: 2050703
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Characterization of a cDNA encoding the 70-kDa single-stranded DNA-binding subunit of human replication protein A and the role of the protein in DNA replication
L F Erdile et al. J Biol Chem. 1991.
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Erratum in
- J Biol Chem 1993 Jan 25;268(3):2268
Abstract
Replication protein A (RP-A) is a three-subunit single-stranded DNA-binding protein that has been isolated from human cells. RP-A is essential for SV40 DNA replication and may also be important in genetic recombination. The sequence of a cDNA encoding the 70-kDa subunit of human RP-A is reported. The 616-amino acid predicted open reading frame of the human protein is 31% identical with the 621-amino acid open reading frame of the 70-kDa subunit of RP-A from the yeast Saccharomyces cerevisiae. Both proteins share a highly conserved putative metal binding domain of the 4-cysteine type. The human cDNA directs production in Escherichia coli of a 70-kDa protein that reacts with a monoclonal antibody directed against the 70-kDa subunit of human RP-A. The recombinant 70-kDa subunit, purified from bacteria, exhibits single-stranded DNA binding activity comparable to that of the complete RP-A complex. The 70-kDa subunit is able to substitute for the complete human RP-A complex in stimulating the activity of DNA polymerase alpha-primase on a poly(dA).oligo(dT) template. However, the 70-kDa subunit alone cannot substitute for the complete RP-A complex in SV40 DNA replication in vitro, suggesting an important functional role for the other subunits.
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