Download MendeleyDiscovering Targetable Conformation of RhoA Mutant by Integrating Native Mass Spectrometry, Ultraviolet Photodissociation, and X-ray Diffraction.
Wu, H., Liu, Z., Jiang, H., Zhao, H., Dong, C., Lu, Y., Zu, S., Guo, Y., Lai, C., Luo, P., Xu, K., Yang, Y., Yang, Y., Sun, Z., Huang, Q., Xiong, H., Zhou, L., Luo, Y., Zeng, Y., Du, D., Liang, Z., Xiao, W., Zhao, S., Zhang, W., Tang, Y., Xiao, C., Chen, K., Yang, X., Wang, F., Luo, C.(2026) J Am Chem Soc
- PubMed: 41837560
- DOI: https://doi.org/10.1021/jacs.5c20067
- Primary Citation Related Structures:
8ZNY, 8ZO0, 9VNG, 9VNH, 9VNI - PubMed Abstract:
Pathogenic mutations in "undruggable" Ras superfamily proteins challenge drug development by inducing subtle, dynamic conformational changes. Here, we integrated X-ray crystallography with native mass spectrometry and ultraviolet photodissociation (nMS-UVPD) to reveal a cryptic conformation in the oncogenic Y42C mutant of RhoA. While crystallography alone resolved two ambiguous structures, nMS-UVPD determined the dominant conformation by directly mapping the mutant's conformational dynamics, identifying an enhanced Mg 2+ -locked conformation. We explored the mechanism of mutation impairing GTP hydrolysis. This state unmasks a previously hidden, druggable pocket adjacent to Cys42, guiding our identification of a covalent inhibitor. Our integrated approach establishes a roadmap for targeting pathogenic protein mutants previously considered "undruggable" due to their highly dynamic nature.
- State Key Laboratory of Discovery and Utilization of Functional Components in Traditional Chinese Medicine, Guizhou Medical University, Guiyang 561113, China.
Organizational Affiliation:
