Abstract:
:Ubiquitylation is fundamental for the regulation of the stability and function of p53 and c-Myc. The E3 ligase Pirh2 has been reported to polyubiquitylate p53 and to mediate its proteasomal degradation. Here, using Pirh2 deficient mice, we report that Pirh2 is important for the in vivo regulation of p53 stability in response to DNA damage. We also demonstrate that c-Myc is a novel interacting protein for Pirh2 and that Pirh2 mediates its polyubiquitylation and proteolysis. Pirh2 mutant mice display elevated levels of c-Myc and are predisposed for plasma cell hyperplasia and tumorigenesis. Consistent with the role p53 plays in suppressing c-Myc-induced oncogenesis, its deficiency exacerbates tumorigenesis of Pirh2(-/-) mice. We also report that low expression of human PIRH2 in lung, ovarian, and breast cancers correlates with decreased patients' survival. Collectively, our data reveal the in vivo roles of Pirh2 in the regulation of p53 and c-Myc stability and support its role as a tumor suppressor.
journal_name
PLoS Genetjournal_title
PLoS geneticsauthors
Hakem A,Bohgaki M,Lemmers B,Tai E,Salmena L,Matysiak-Zablocki E,Jung YS,Karaskova J,Kaustov L,Duan S,Madore J,Boutros P,Sheng Y,Chesi M,Bergsagel PL,Perez-Ordonez B,Mes-Masson AM,Penn L,Squire J,Chen X,Jurisica Idoi
10.1371/journal.pgen.1002360subject
Has Abstractpub_date
2011-11-01 00:00:00pages
e1002360issue
11eissn
1553-7390issn
1553-7404pii
PGENETICS-D-11-00625journal_volume
7pub_type
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