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Control of human PIRH2 protein stability: Involvement of TIP60 and the proteasome

Lookup NU author(s): Dr Ian Logan, Dr Vasileia Sapountzi, Dr Luke Gaughan, Professor David Neal, Professor Craig Robson

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Abstract

Murine PIRH2 (mPIRH2) was recently identified as a RING finger-containing ubiquitin-protein isopeptide ligase that interacts with both p53 and the human androgen receptor. mpirh2 is a p53-responsive gene that is up-regulated by UV, and mPIRH2 protein has the capacity to polyubiquitylate p53, perhaps leading to p53 destruction. mpirh2 therefore has properties similar to those of the oncogene mdm2. Here, we have identified human PIRH2 (hPIRH2) as a TIP60-interacting protein. To investigate its regulation, we characterized hPIRH2 in parallel with hPIRH2 variants possessing mutations of conserved RING finger residues. We observed that wild-type hPIRH2 is an unstable protein with a short half-life and is a target for RING domain-dependent proteasomal degradation. Accordingly, we found that hPIRH2 was ubiquitylated in cells. The TIP60-hPIRH2 association appeared to regulate hPIRH2 stability; coexpression of TIP60 enhanced hPIRH2 protein stability and altered hPIRH2 subcellular localization. These results suggest that hPIRH2 activities can be controlled, at the post-translational level, in multiple ways.


Publication metadata

Author(s): Logan, I. R., Sapountzi, V., Gaughan, L., Neal, D. E., Robson, C. N.

Publication type: Article

Publication status: Published

Journal: Journal of Biological Chemistry

Year: 2004

Volume: 279

Issue: 12

Pages: 11696-11704

Print publication date: 19/03/2004

ISSN (print): 0021-9258

ISSN (electronic): 1083-351X

URL: http://dx.doi.org/10.1074/jbc.M312712200

DOI: 10.1074/jbc.M312712200

PubMed id: 14701804


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