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Journal of Biochemistry Advance Access published online on October 9, 2008
Journal of Biochemistry, doi:10.1093/jb/mvn135
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© 2008 The Japanese Biochemical Society

PPM1D430, a Novel Alternative Splicing Variant of the Human PPM1D, can Dephosphorylate p53 and Exhibits Specific Tissue Expression

Yoshiro Chuman, Wataru Kurihashi, Yohei Mizukami, Takehiro Nashimoto, Hiroaki Yagi and Kazuyasu Sakaguchi*

Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan

*Corresponding Author: Prof. Kazuyasu Sakaguchi, PhD. Laboratory of Biological Chemistry, Department of Chemistry Faculty of Science, Hokkaido University Kita 10 Nishi 8, Kita-Ku, Sapporo 060-0810, Japan, Phone: 81-11-706-2698, Fax: 81-11-706-4683, Email: kazuyasu{at}sci.hokudai.ac.jp.

Received July 25, 2008; Accepted September 25, 2008


  Abstract

PPM1D is a PPM1 type protein phosphatase and is induced in response to DNA damage. PPM1D-deficient mice show defects in spermatogenesis and lymphoid cell functions but the mechanisms underlying these phenotypes remain unknown. In our current study, we identify and characterize an alternative splicing variant (denoted PPM1D430) of human PPM1D at both the mRNA and protein level. PPM1D430 comprises the common 420 residues of the known PPM1D protein (PPM1D605) and contains a stretch of PPM1D430-specific 10 amino acids. Semi-quantitative RT-PCR analysis revealed that PPM1D430 mRNA is also induced in response to the genotoxic stress in a p53-dependent manner. In vitro phosphatase analysis and PPM1D430-specific RNA interference analysis further indicated that PPM1D430 can dephosphorylate Ser15 of human p53 both in vitro and in vivo. On the other hand, expression profiling of this gene by RT-PCR analysis of a human tissue cDNA panel revealed that PPM1D430 is expressed exclusively in testes and in leukocytes whereas PPM1D605 is ubiquitous. In addition, PPM1D430 shows a different subcellular localization pattern and protein stability when compared with PPM1D605 under some conditions. Our current findings thus suggest that PPM1D430 may exert specific functions in immune response and/or spermatogenesis.

Key Words: alternative splicing variant, p53, phosphatase, PPM1D, tissue-specific expression


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