Download MendeleyComprehensive profiling of the catalytic conformations of human Guanylate kinase.
Wang, L., Li, Z., Xuan, Y., Qin, J., Li, S., Zhong, F., Song, Y., Yang, K., Lv, M., Li, F., Jiahai, Z., Pan, Y., Guang, S., Zhao, Y., Shi, Y., Liu, X., Du, Y., Gao, J., Ruan, K.(2025) Nat Commun 16: 6859-6859
- PubMed: 40715061
- DOI: https://doi.org/10.1038/s41467-025-61732-y
- Primary Citation of Related Structures:
9J8L, 9JAB, 9JAC, 9JAD, 9JAE, 9JAF, 9JAG, 9JAH, 9JAI, 9JAJ, 9LO3, 9LO6 - PubMed Abstract:
Human guanylate kinase (GMPK) as the sole enzyme for GDP biosynthesis plays pivotal roles in antiviral prodrug activation and tumorigenesis. Despite its biological significance, the catalytic mechanism remains poorly understood. Here, we resolve crystal structures of GMPK in free and GMP-bound form, revealing the interdomain motions of GMPBD and LID relative to the CORE domain. Biochemical assays demonstrate potassium's dual functionality in substrate recognition and phosphoryl transfer catalysis. Structural analyses uncover intradomain conformational motion within the LID domain and essential interactions for ADP/ATP binding. Notably, the cooperative ATPγS binding potentiated by prior GMP binding are structurally elucidated. Three key complexes, pre-reaction state (GMP/ATPγS), transition state (AlF 4 - mimic), and post-reaction state (GDP/ADP), collectively delineate the reversible catalytic pathway. This comprehensive structural characterization of GMPK's dynamic landscape establishes a foundation for developing conformation-specific inhibitors through structure-guided drug design.
- Department of Oncology, the First Affiliated Hospital & School of Life Sciences, Ministry of Education Key Laboratory for Membrane-less Organelles & Cellular Dynamics, Hefei National Research Center for Interdisciplinary Sciences at the Microscale, Biomedical Sciences and Health Laboratory of Anhui Province, Center for Advanced Interdisciplinary Science and Biomedicine of IHM, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230027, China.
Organizational Affiliation:
