Cited by 39Protein Kinase Regulation and GTPase SignalingMass Spectrometry Techniques and ApplicationsProtein Tyrosine Phosphatases

Intrinsic GTPase activity of K-RAS monitored by native mass spectrometry

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Moghadamchargari, Zahra, Huddleston, Jamison, Shirzadeh, Mehdi, Zheng, Xueyun, Clemmer, David E., M. Raushel, Frank, Russell, David H., Laganowsky, Arthur·2019·Biochemistry

Abstract

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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Crossref · 10.1021/acs.biochem.9b00532

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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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Research works printed but not linked: 2

  1. [12]Vetter IR, and Wittinghofer A (2001) The guanine nucleotide-binding switch in three dimensions. Science 294, 1299– 1304. 11701921
  2. [38]Hilton GR, and Benesch JL (2012) Two decades of studying non-covalent biomolecular assemblies by means of electrospray ionization mass spectrometry. J. R. Soc., Interface 9, 801– 816. 22319100 PMC3306659

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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
Published
2019-07-15
Volume
58
Issue
31
Pages
3396-3405
ISSN
  • 0006-2960 (ISSN-L)
  • 1520-4995
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
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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