c-myc and p53 networks control proliferation, differentiation, and apoptosis and are responsive to, and cross-regulate a variety of stresses and metabolic and biosynthetic processes. At c-myc, the far upstream element binding protein (FBP) and FBP-interacting repressor (FIR) program transcription by looping to RNA polymerase II complexes engaged at the promoter. Another FBP partner, JTV1/AIMP2, a structural subunit of a multi-aminoacyl-tRNA synthetase (ARS) complex, has also been reported to stabilize p53 via an apparently independent mechanism. Here, we show that in response to oxidative stress, JTV1 dissociates from the ARS complex, translocates to the nucleus, associates with FBP and co-activates the transcription of a new FBP target, ubiquitin-specific peptidase 29 (USP29). A previously uncharacterized deubiquitinating enzyme, USP29 binds to, cleaves poly-ubiquitin chains from, and stabilizes p53. The accumulated p53 quickly induces apoptosis. Thus, FBP and JTV1 help to coordinate the molecular and cellular response to oxidative stress.
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