Keiji Tanaka

Tokyo Metropolitan Institute of Medical Science

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About

Keiji Tanaka is a pioneering figure in the molecular biology of protein degradation systems, with a career-spanning focus on ubiquitin and ubiquitin-like modifiers. His seminal work has illuminated the structural and functional mechanisms of the ubiquitin-proteasome pathway, but he is perhaps best known for his discovery and characterization of the Ufm1 system—a novel ubiquitin-like modifier. In his highly cited 2008 study (59 citations), Tanaka elucidated the structural basis for Ufm1 processing by the protease UfSP1, revealing how this modifier is activated for conjugation to target proteins. This work opened a new frontier in understanding cellular stress responses and protein homeostasis. Beyond this, Tanaka's contributions to the proteasome field have been transformative, with his research collectively amassing tens of thousands of citations. His achievements include pioneering the biochemical purification of the 26S proteasome and identifying key regulatory subunits. A recipient of numerous international awards, Tanaka's legacy lies in decoding the intricate machinery that governs protein turnover—a cornerstone of modern cell biology and a critical target for therapeutic intervention in cancer and neurodegenerative diseases.