Cancer-associated point mutations within the extracellular domain of PTPRD affect protein stability and HSPG interaction

Yu Matsui, Ayako Tabata, Hironori Izumi, Misato Yasumura, Teruhiko Makino, Tadamichi Shimizu, Makoto Sato, Hisashi Mori, Tomoyuki Yoshida*

*この論文の責任著者

研究成果: ジャーナルへの寄稿学術論文査読

2 被引用数 (Scopus)

抄録

PTPRD, a well-established tumor suppressor gene, encodes the protein tyrosine phosphatase-type D. This protein consists of three immunoglobulin-like (Ig) domains, four to eight fibronectin type 3 (FN) domains, a single transmembrane segment, and two cytoplasmic tandem tyrosine phosphatase domains. PTPRD is known to harbor various cancer-associated point mutations. While it is assumed that PTPRD regulates cellular functions as a tumor suppressor through the tyrosine phosphatase activity in the intracellular region, the function of its extracellular domain (ECD) in cancer is not well understood. In this study, we systematically examined the impact of 92 cancer-associated point mutations within the ECD. We found that 69.6% (64 out of 92) of these mutations suppressed total protein expression and/or plasma membrane localization. Notably, almost all mutations (20 out of 21) within the region between the last FN domain and transmembrane segment affected protein expression and/or localization, highlighting the importance of this region for protein stability. We further found that some mutations within the Ig domains adjacent to the glycosaminoglycan-binding pocket enhanced PTPRD's binding ability to heparan sulfate proteoglycans (HSPGs). This interaction is proposed to suppress phosphatase activity. Our findings therefore suggest that HSPG-mediated attenuation of phosphatase activity may be involved in tumorigenic processes through PTPRD dysregulation.

本文言語英語
論文番号e23609
ジャーナルFASEB Journal
38
7
DOI
出版ステータス出版済み - 2024/04/15

ASJC Scopus 主題領域

  • バイオテクノロジー
  • 生化学
  • 分子生物学
  • 遺伝学

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