Cited by 117Protein Kinase Regulation and GTPase SignalingEvolution and Genetic DynamicsProtein Structure and Dynamics

Deconstruction of the Ras switching cycle through saturation mutagenesis

Open access
Bandaru, Pradeep, Shah, Neel H, Bhattacharyya, Moitrayee, Barton, John P, Kondo, Yasushi, Cofsky, Joshua C, Gee, Christine L, Chakraborty, Arup K +3 more·2017·eLife

Abstract

Ras proteins are highly conserved signaling molecules that exhibit regulated, nucleotide-dependent switching between active and inactive states. The high conservation of Ras requires mechanistic explanation, especially given the general mutational tolerance of proteins. Here, we use deep mutational scanning, biochemical analysis and molecular simulations to understand constraints on Ras sequence. Ras exhibits global sensitivity to mutation when regulated by a GTPase activating protein and a nucleotide exchange factor. Removing the regulators shifts the distribution of mutational effects to be largely neutral, and reveals hotspots of activating mutations in residues that restrain Ras dynamics and promote the inactive state. Evolutionary analysis, combined with structural and mutational data, argue that Ras has co-evolved with its regulators in the vertebrate lineage. Overall, our results show that sequence conservation in Ras depends strongly on the biochemical network in which it operates, providing a framework for understanding the origin of global selection pressures on proteins.

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Crossref · 10.7554/elife.27810

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  • RAS mutants were once thought to be locked in the GTP-bound on state and undruggable, but detailed structural and biochemical analyses have revealed differences among RAS mutants in GTPase activity, GDP-GTP exchange and effector binding.

    “RAS mutants were once viewed as being ‘locked’ in the GTP-bound ‘on’ state, impervious to GAP-stimulated or intrinsic GTP hydrolysis, and hence undruggable. However, detailed structural and biochemical analyses of various RAS mutants associated with cancer and ‘RASopathies’”
  • Some oncogenic KRAS mutants, notably KRASG12C and to a lesser extent KRASG12D, retain significant intrinsic GTPase activity.

    “Some oncogenic mutants, notably KRASG12C (G12C) and, to a lesser extent, KRASG12D (G12D), retain significant intrinsic GTPase activity.”

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Authors
Bandaru, P., Shah, N. H., Bhattacharyya, M., Barton, J. P., Kondo, Y., Cofsky, J. C., Gee, C. L., Chakraborty, A. K., Kortemme, T., Ranganathan, R., & Kuriyan, J.
Affiliations
  • QB3 (US)
  • Ragon Institute of MGH, MIT and Harvard (US)
  • University of California, San Francisco (US)
  • The University of Texas Southwestern Medical Center (US)
Corresponding author
  • Ranganathan, Rama
  • Kuriyan, John
Venue
eLife
Published
2017-07-07
Volume
6
ISSN
2050-084X (ISSN-L)
OpenAlex
W2727251566
Cited by
117
References
91
Citations by year
2026: 7 · 2025: 16 · 2024: 7 · 2023: 14 · 2022: 16 · 2021: 19 · 2020: 11 · 2019: 11 · 2018: 13 · 2017: 3
FWCI
4.25
Type
journal article
Language
en
Open access
Locations
  • eLife (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • Howard Hughes Medical Institute
  • Damon Runyon Cancer Research Foundation
  • National Institutes of Health
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Evolution and Genetic Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
Keywords
Ras proteins, deep mutational scanning, saturation mutagenesis, GTPase-activating protein, nucleotide exchange factor, mutational tolerance, sequence conservation
MeSH terms
DNA Mutational Analysis, Humans, Mutagenesis, Conserved Sequence, ras Proteins, Evolution, Molecular, Protein Interaction Maps

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