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Updated: Jul 16, 2026

A Mass Spectrometry-Based Approach to Identify Phosphoprotein Phosphatases and their Interactors
Published on: April 29, 2022
Identification of a novel isoform of iASPP and its interaction with p53
Xinwei Zhang1, Shiyong Diao, Qing Rao
1State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Science and Peking Union Medical College, Tianjin 300020, China.
Abstract:
iASPP is an inhibitory member of ASPP (apoptosis stimulating protein of p53, or Ankyrin repeats, SH3 domain and proline-rich region contain Protein) family. As reported previously, it at least includes two isoforms, one is iASPP/RAI (351 amino acids, aa) and the other is iASPP (828 aa).Here, we identified a novel open reading frame of human iASPP, which encodes a 407 aa protein and highly matches with the C terminus of iASPP (828 aa, CAI60219). Hereafter, iASPP (407 aa) will be referred to as iASPP-SV (iASPP splice variant). In further study, we found that iASPP-SV is a nuclear protein, and is capable of binding to p53 in vivo. Moreover, overexpression of iASPP-SV can inhibit the transcriptional activity of p53 on the promoters of both Bax and p21.
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