Replication protein A (RP-A; also known as replication factor A and human SSB), is a single-stranded DNA-binding protein that is required for simian virus 40 DNA replication in vitro. RP-A isolated from both human and yeast cells is a very stable complex composed of 3 subunits (70, 32, and 14 kDa). We have analyzed the DNA-binding properties of both human and yeast RP-A in order to gain a better understanding of their role(s) in DNA replication. Human RP-A has high affinity for single-stranded DNA and low affinity for RNA and double-stranded DNA. The apparent affinity constant of RP-A for single-stranded DNA is in the range of 10(9) M-1. RP-A has a binding site size of approximately 30 nucleotides and does not bind cooperatively. The binding of RP-A to single-stranded DNA is partially sequence dependent. The affinity of human RP-A for pyrimidines is approximately 50-fold higher than its affinity for purines. The binding properties of yeast RP-A are similar to those of the human protein. Both yeast and human RP-A bind preferentially to the pyrimidine-rich strand of a homologous origin of replication: the ARS307 or the simian virus 40 origin of replication, respectively. This asymmetric binding suggests that RP-A could play a direct role in the process of initiation of DNA replication.
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| Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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| Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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| Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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| Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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| Site | Modification | Modifier | Source | Reference |
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| Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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| Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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| Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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| Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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