ArticleAmerican journal of cancer research2024
Protein tyrosine phosphatase PTPH1 potentiates receptor tyrosine kinase HER2 oncogenesis via a PDZ-coupled and phosphorylation-driven scaffold.
Article in American journal of cancer research, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Cancer cell overexpresses numerus proteins, however, how these up-regulated proteins, especially those enzymatically opposite kinases and phosphatases, act together to promote oncogenesis is unknown. Here, we reported that protein tyrosine phosphatase H1 (PTPH1) is a scaffold protein for receptor tyrosine kinase (HER2) to potentiate breast tumorigenesis. PTPH1 utilizes its PDZ domain to bind HER2, p38γ, PBK, and YAP1 and to increase HER2 nuclear translocation, stemness, and oncogenesis. PTPH1 de-phosphorylates HER2 and reciprocally increases HER2 protein expression dependent on cellular content. PTPH1 itself can be phosphorylated at S459 by redundant kinases p38γ and/or PBK, thereby distinctively regulating expression and/or turnover of scaffold proteins. Moreover, PTPH1 and HER2 cooperate to increase PBK and Yap1 transcription thus acting as an additional mechanism to activate the scaffold. PTPH1 protein levels are higher in HER2
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