YRF1-3/YGR296W Summary 
YRF1-3 BASIC INFORMATION
| Standard Name | YRF1-3 |
|---|---|
| Systematic Name | YGR296W |
| Alias | YRF1 |
| Feature Type | ORF, Verified |
| Description | Helicase encoded by the Y' element of subtelomeric regions, highly expressed in the mutants lacking the telomerase component TLC1; potentially phosphorylated by Cdc28p (1, 2 and see Summary Paragraph) 
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| GO Annotations | All YRF1-3 GO evidence and references |
|---|---|
| View Computational GO annotations for YRF1-3 | |
| Molecular Function | |
| Manually curated | |
| Biological Process | |
| Manually curated | |
| Cellular Component | |
| Manually curated |
| Interactions | YRF1-3 All interactions details and references |
|---|---|
| 4 total interaction(s) for 4 unique genes/features. | |
| Physical Interactions |
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| External Links | All Associated Seq | E.C. | Entrez Gene | Entrez RefSeq Protein | MIPS | UniProtKB |
|---|
| Primary SGDID | S000003528 |
|---|
YRF1-3 RESOURCES
| SGD ORF map | GBrowse |
|---|---|
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Click on histogram for expression summary
Expression Summary
ADDITIONAL INFORMATION for YRF1-3
REPEATED NOTE
| Name | Relevance | Description |
|---|---|---|
| YRF1-2 | Repeated | YRF1 is repeated several times in the genome. |
| YRF1-1 | Repeated | YRF1 is repeated several times in the genome. |
| YRF1-7 | Repeated | YRF1 is repeated several times in the genome. |
| YRF1-4 | Repeated | YRF1 is repeated several times in the genome. |
| YRF1-5 | Repeated | YRF1 is repeated several times in the genome. |
| YRF1-6 | Repeated | YRF1 is repeated several times in the genome. |
SUMMARY PARAGRAPH for YRF1-3
The YRF1 genes are found in telomeric Y' elements and encode a DNA helicase known as Y'-Help1 (Y'-HELicase Protein 1), which is induced in strains deficient for telomerase activity (1). Native Y' elements do not appear to be expressed in wild-type cells, probably due to the telomeric silencing effect (3). Thus, Y'-Help1 expression from shortened telomeres, in which silencing is no longer effective, seems to indicate the presence of a system for the compensation of telomeric loss by telomerase-independent mechanisms (1). It is proposed that the induction of Y'-Help1 promotes homologous DNA recombination among Y' elements, thereby facilitating their amplification, resulting in the lengthening of telomeric ends and prevention of chromosome loss and cell death. This amplification of Y' elements will further increase the production of Y'-Help1, establishing a positive feedback circuit for telomeric rescue in cells with shortened telomeres (1).
The N-terminal region of Y'-Help1 is composed of motifs conserved in the DEAD/DEAH (or DEXH) subfamily of helicases, and the central region of the protein contains several tandem repeats of the serine-threonine-rich 12-amino acid sequence SXTXATTTXSXX, the number of which varies between the different Y' elements (1). Y'-Help1 also shares regions of homology with the RNA helicase eukaryotic translation initiation factor 4A (Tif1p and Tif2p in S. cerevisiae), as well as the homologous DNA recombination protein RecG of the hyperthermophilic bacterium Aquifex (1).
Last updated: 2006-06-27
REFERENCES CITED ON THIS PAGE [View Complete Literature Guide for YRF1-3]
| 1) | Yamada M, et al. (1998) Y'-Help1, a DNA helicase encoded by the yeast subtelomeric Y' element, is induced in survivors defective for telomerase. J Biol Chem 273(50):33360-6 |
| 2) | Ubersax JA, et al. (2003) Targets of the cyclin-dependent kinase Cdk1. Nature 425(6960):859-64 |
| 3) | Gottschling DE, et al. (1990) Position effect at S. cerevisiae telomeres: reversible repression of Pol II transcription. Cell 63(4):751-62 |
