Longfu Xu, PhD

Many cancers develop when crucial “cellular machinery” malfunctions. One component of this machinery is the ring ATPase, which harnesses the energy from ATP to perform essential tasks such as maintaining protein homeostasis and ensuring genome stability—processes vital for preventing uncontrolled cell growth. Understanding precisely how these complex human ring ATPases operate and coordinate their actions remains a significant challenge. Dr. Xu’s [HHMI Fellow] research focuses on a mechanically similar, yet structurally simpler, ring ATPase found in the φ29 bacteriophage. By filming high-resolution “movies” of this viral ring ATPase in action using advanced single-molecule techniques, Dr. Xu aims to uncover the fundamental principles of its mechanochemical cycle. This will reveal, step-by-step, how it converts chemical energy into the precise mechanical forces and coordinated movements required to stabilize DNA. This work is relevant to a range of cancers where cellular ring ATPases are dysregulated, and the insights gained could pave the way for novel therapeutic strategies targeting these essential molecular machines. Dr. Xu received his PhD from Vrije Universiteit, Amsterdam, his MS from the University of Chinese Academy of Sciences, Beijing, and his BS from Northeast Agriculture University, Harbin.