Intrinsic GTPase activity of K-RAS monitored by native mass spectrometry
Open accessAbstract
Mutations in RAS are associated with many different cancers and have been a therapeutic target for more than three decades. RAS cycles from an active to inactive state by both intrinsic and GTPase-activating protein (GAP)-stimulated hydrolysis. The activated enzyme interacts with downstream effectors, leading to tumor proliferation. Mutations in RAS associated with cancer are insensitive to GAP, and the rate of inactivation is limited to their intrinsic hydrolysis rate. Here, we use high-resolution native mass spectrometry (MS) to determine the kinetics and transition state thermodynamics of intrinsic hydrolysis for K-RAS and its oncogenic mutants. MS data reveal heterogeneity where both 2'-deoxy and 2'-hydroxy forms of GDP (guanosine diphosphate) and GTP (guanosine triphosphate) are bound to the recombinant enzyme. Intrinsic GTPase activity is directly monitored by the loss in mass of K-RAS bound to GTP, which corresponds to the release of phosphate. The rates determined from MS are in direct agreement with those measured using an established solution-based assay. Our results show that the transition state thermodynamics for the intrinsic GTPase activity of K-RAS is both enthalpically and entropically unfavorable. The oncogenic mutants G12C, Q61H, and G13D unexpectedly exhibit a 2'-deoxy GTP intrinsic hydrolysis rate higher than that for GTP.
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Upon G12 and G13 mutation, GAP-mediated K-Ras inactivation is hampered, resulting in accumulation of GTP-bound active K-Ras.
“Upon G12 and G13 mutation, GAPs-mediated K-Ras inactivation is hampered, resulting in the accumulation of GTP-bound active K-Ras.24,39”
From Overcoming Resistance to Drugs Targeting KRAS Mutation (2020) · cites this paper as [39]
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Self-citationZhao, D.-R., Yang, J.-T., Liu, M.-T., Yang, L.-Q., & Sang, P. (2025) · RSC Advances · doi:10.1039/d4ra07924h · Cited by 8 · see citing works
Progress in Targeting KRAS Directly
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Brønsted-basic small molecules activate GTP hydrolysis in KRAS-Q61 mutants
Wang, Y., Chen, S., Cao, Y., Wu, Y., Shi, Z., Wang, C. D., Norinskiy, M. A., Celik, H., & Zhang, Z. (2026) · Nature Chemical Biology · doi:10.1038/s41589-026-02291-1 · Cited by 2 · see citing works
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Time-Resolved Native Mass Spectrometry for Direct Measurement of Biomolecular Kinetics
James, V. K., Stover, L., Bahramimoghaddam, H., Khandelwal, T., Chang, J., Downing, J., Scott, E., Bailey, K. O., Russell, D. H., Baker, L. A., et al. (2026) · Journal of the American Chemical Society · doi:10.1021/jacs.5c21842 · Cited by 1 · see citing works
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Real time characterization of the MAPK pathway using native mass spectrometry
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Self-citationBindingDB Entry 50014692: Discovery of a Bicyclic Peptidyl Pan-Ras Inhibitor.
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- Authors
- Moghadamchargari, Z., Huddleston, J., Shirzadeh, M., Zheng, X., Clemmer, D. E., M. Raushel, F., Russell, D. H., & Laganowsky, A.
- Affiliations
- Texas A&M University (US)
- Indiana University Bloomington (US)
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
- Corresponding author
- Laganowsky, Arthur
- Venue
- Biochemistry
- Publisher
- American Chemical Society (ACS)
- Published
- 2019-07-15
- Volume
- 58
- Issue
- 31
- Pages
- 3396-3405
- ISSN
- 0006-2960 (ISSN-L)
- 1520-4995
- PMC
- PMC7196336
- OpenAlex
- W2956719127
- Cited by
- 38
- References
- 75
- Citations by year
- 2026: 5 · 2025: 5 · 2024: 6 · 2023: 7 · 2022: 3 · 2021: 6 · 2020: 6
- FWCI
- 1.32
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Licence
- Locations
- Biochemistry (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Funders
- U.S. Department of Health and Human Services (P41GM128577, RO1GM121751)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
- Physical Sciences › Chemistry › Spectroscopy › Mass Spectrometry Techniques and Applications
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Tyrosine Phosphatases
- Keywords
- KRAS, transition state thermodynamics, oncogenic Ras mutations, GTPase-activating protein, native mass spectrometry
- MeSH terms
- Deoxyguanine Nucleotides, Enzyme Activation, Hydrolysis, Mutation, Mass Spectrometry, Thermodynamics, Proto-Oncogene Proteins p21(ras), GTP Phosphohydrolases, Carcinogenesis
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