The evolutionarily conserved PIF1 DNA helicase family is important for the maintenance of genome stability in the yeast, Saccharomyces cerevisiae. There are two PIF1 family helicases in S. cerevisiae, Pif1p and Rrm3p that both possess 5'-->3' DNA helicase activity but maintain unique functions in telomerase regulation and semi-conservative DNA replication. Database analysis shows that the PIF1 helicase family is represented by a single homologue in higher eukaryotes. To analyze the function of PIF1 homologues in mammals, we cloned the full length human PIF (hPIF) cDNA. Comparison of hPIF with its S. cerevisiae homologues showed that human PIF is equally similar to Pif1p and Rrm3p. Human PIF was expressed at low levels in a variety of tissues and immunofluorescence analysis showed that ectopic hPIF was localized to nuclear foci. hPIF was expressed in late S/G2 phase of the cell cycle and this cell cycle regulated abundance was conferred by both cell cycle regulated mRNA accumulation and ubiquitin-mediated degradation. Furthermore, hPIF is likely a target of the anaphase promoting complex/cyclosome as its abundance was decreased when an activator of the APC/C was overexpressed. Finally, antibodies against hPIF immunoprecipitated telomerase activity from human cell lines, and we have observed a physical interaction between hPIF and the catalytic subunit of telomerase, hTERT. Our data suggest that human PIF, like S. cerevisiae Pif1p, plays a role in telomerase regulation.
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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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