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HAUSP, a deubiquitinating enzyme for p53, is polyubiquitinated, polyneddylated, and dimerized
Author(s) -
Lee Hye-Jin,
Kim Myung-Sun,
Kim Yu-Kyung,
Oh Yu-Kyoung,
Baek Kwang-Hyun
Publication year - 2005
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2005.07.048
Subject(s) - deubiquitinating enzyme , ubiquitin , immunoprecipitation , proteasome , mdm2 , microbiology and biotechnology , suppressor , enzyme , biology , chemistry , biochemistry , gene
The tumor suppressor protein p53 is ubiquitinated and neddylated by MDM2 and then degraded by 26S proteasome. However, p53 is stabilized by the HAUSP (Herpes‐virus‐associated ubiquitin‐specific protease) deubiquitinating enzyme. In this study, we discovered that rat HAUSP (rHAUSP) is polyubiquitinated, polyneddylated, and dimerized using co‐immunoprecipitation assays. This suggests that rHAUSP may function as a dimer or multimer and is also degraded through the proteasome‐mediated degradation. Transfection of rHAUSP into RGC‐Lac‐Z cell line with the integrated p53 response element revealed that rHAUSP contributed to p53 stabilization, and a rHAUSP (C224S) mutant contributed to p53 destabilization in a dose‐dependent manner.