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- Title
The proteasome factor Bag 101 binds to Rad22 and suppresses homologous recombination.
- Authors
Yuichiro Saito; Jun Takeda; Masahiro Okada; Junya Kobayashi; Akihiro Kato; Kouji Hirota; Masato Taoka; Tomohiro Matsumoto; Kenshi Komatsu; Toshiaki Isobe
- Abstract
Although RAD52 plays a critical role in the initiation of homologous recombination (HR) by facilitating the replacement of RPA with RAD51, the mechanism controlling RAD52 remains elusive. Here, we show that Bag101, a factor implicated in proteasome functioning, regulates RAD52 protein levels and subsequent HR. LC-MS/MS analysis identified Bag101 which binds to Rad22, the fission yeast homologue of RAD52. Bag101 reduced HR frequency through its overexpression and conversely, HR frequencies were enhanced when it was deleted. Consistent with this observation, Rad22 protein levels was reduced in cells where bag101 was overexpressed even when Rad22 transcription was up-regulated, suggesting the operation of proteasome-mediated Rad22 degradation. Indeed, Rad22 protein levels were stabilized in proteasome mutants. Rad22 physically interacted with the BAG domain of Bag101, and a lack of this domain enhanced HR frequency. Similarly, radiation exposure triggered the dissociation of these proteins so that Rad22 was stabilized and able to enhance HR.
- Subjects
PROTEASOMES; IMMUNOSUPPRESSION; HOMOLOGOUS chromosomes; EDIBLE fungi; RADIATION exposure
- Publication
Scientific Reports, 2013, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/srep02022