ArticleJournal of microbiology (Seoul, Korea)2026
Molecular analysis of the interaction between ubiquitin-specific protease 7 and large T antigen of Merkel cell polyomavirus.
Article in Journal of microbiology (Seoul, Korea), 2026. 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
Merkel cell polyomavirus (MCPyV) is the primary causative agent of Merkel cell carcinoma, a rare but highly aggressive neuroendocrine skin cancer. Large T antigen (LT), one of two oncoproteins encoded by MCPyV, sustains the proliferation of MCPyV-infected tumor cells. LT contains multiple protein-binding motifs that mediate interactions with diverse host proteins essential for its function. Among these, ubiquitin-specific protease 7 (Usp7), a deubiquitinase that regulates the stability of multiple substrates, including p53, is a recently identified LT-interacting protein. In the present study, we characterized the intermolecular interaction between Usp7 and MCPyV LT using biochemical analyses and AlphaFold-based structural modeling. Our results demonstrate that MCPyV LT directly interacts with the TRAF domain of Usp7 via a unique binding motif that is distinct from the canonical sequence. Moreover, MCPyV LT attenuates the p53-deubiquitinating activity of Usp7, providing insights into the molecular function of this viral oncoprotein.
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