Cited by 700Protein Kinase Regulation and GTPase SignalingProtein Tyrosine PhosphatasesMelanoma and MAPK Pathways

Allele-specific inhibitors inactivate mutant KRAS G12C by a trapping mechanism

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Lito, Piro, Solomon, Martha, Li, Lian-Sheng, Hansen, Rasmus, Rosen, Neal·2016·Science

Abstract

Cancer therapy by entrapment: Mutations in the KRAS oncogene occur at high frequency in several of the most lethal human cancers, including lung and pancreatic cancer. Substantial effort has thus been directed toward developing KRAS inhibitors. KRAS encodes an enzyme that binds the nucleotide GTP and hydrolyzes it to GDP. It had been thought that oncogenic mutations disable this hydrolytic activity, locking KRAS in the GTP-bound, active state. Surprisingly, Lito et al. found that a certain KRAS mutant (G12C) retains hydrolytic activity and continues to cycle between its active and inactive states. They describe a compound that inhibits KRAS(G12C) signaling and tumor cell growth by binding to the GDPbound form of KRAS, trapping it in its inactive state. Science , this issue p. 604

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Crossref · 10.1126/science.aad6204

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  • Early preclinical studies with KRASG12C inhibitors such as ARS-1620 suggested adaptive feedback as a potential resistance mechanism.

    “early preclinical studies with KRASG12C inhibitors, such as ARS-1620, have suggested a potential role for adaptive feedback as a mechanism of resistance (7) (15).”

    From Vertical Pathway Inhibition Overcomes Adaptive Feedback Resistance to KRASG12C Inhibition (2020) · cites this paper as [7]

    The paper’s indexed text (section labeled Abstract; page unavailable) reports that feedback-related RTK activation attenuated the inhibitory effect of ARS853 and suggests ways resistance to this class of drugs might emerge. It studies ARS853, not the cited example ARS-1620, so it does not directly support the claim for that compound. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Increased RTK activity may lead to increased cycling of KRASG12C to its active GTP-bound form that hinders the binding of most KRASG12C inhibitors, which bind specifically to the inactive GDP-bound form.

    “First, as described by Lito et al, increased RTK activity may lead to increased cycling of KRASG12C to its active GTP-bound form that hinders the binding of most KRASG12C inhibitors, which bind specifically to the inactive GDP-bound form (7).”

    From Vertical Pathway Inhibition Overcomes Adaptive Feedback Resistance to KRASG12C Inhibition (2020) · cites this paper as [7]

    In the supplied copy (section labeled Abstract; no page given), Lito et al. report that RTK-mediated nucleotide exchange affects inhibition and that increased exchange lowers the GDP-bound KRASG12C available for ARS853 binding. This supports the proposed mechanism for ARS853, but the paper does not establish that most KRASG12C inhibitors bind specifically to the GDP-bound form. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Compounds bind covalently to cysteine 12 in the switch II pocket of GDP-bound KRASG12C, preventing oncogenic signaling and causing tumor regressions in preclinical models.

    “compounds have been identified that bind covalently to cysteine 12 within the switch II pocket of the GDP-bound form of the KRASG12C protein, preventing oncogenic signaling and causing potent tumor regressions in preclinical models.3-7”

    From Acquired Resistance to KRAS <sup>G12C</sup> Inhibition in Cancer (2021) · cites this paper as [4]

    The paper’s main text (indexed under Abstract; page unavailable) reports that ARS853 preferentially binds GDP-bound KRASG12C and suppresses KRAS-GTP and downstream signaling in mutant lung cancer cells. The passages do not establish covalent binding specifically to cysteine 12 in the switch II pocket, and they report cell-line growth inhibition and apoptosis—not potent tumor regressions in preclinical models. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • The appreciable degree of nucleotide cycling observed in KRASG12C-mutant protein proved critical for the development of clinically active KRASG12C-selective inhibitors which bind the GDP-bound conformation and lock KRAS in the inactive state.

    “Moreover, the appreciable degree of nucleotide cycling observed in KRAS G12C -mutant protein proved critical for the development of clinically active KRAS G12C -selective inhibitors which bind the GDP-bound conformation and lock KRAS in the inactive state [7-9].”

    From Anti-tumor efficacy of a potent and selective non-covalent KRASG12D inhibitor (2022) · cites this paper as [8]

    Split into 2 atoms — 1 confirmed, 1 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

    Experimental — accuracy not yet measured
  • EGFR is a major mediator of adaptive feedback in colorectal cancer.

    “Preclinical studies have identified EGFR as a major mediator of adaptive feedback, and concomitant blockade of EGFR has been shown to enhance the antitumor activity of KRAS G12C inhibition12,15.”

    From Divarasib plus cetuximab in KRAS G12C-positive colorectal cancer: a phase 1b trial (2024) · cites this paper as [15]

    The paper reports that EGFR inhibition enhanced the effects of the KRAS G12C inhibitor ARS853 in two lung cancer cell lines (Abstract, page not provided). It does not establish EGFR as a major mediator of adaptive feedback in colorectal cancer; it says the relevant receptor signaling in lung cancer varies from tumor to tumor. (LLM, conf=0.87)

    Experimental — accuracy not yet measured

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Research works printed but not linked: 1

  1. [24]Patel G MacDonald MJ Khosravi-Far R Hisaka MM Der CJ Oncogene 7 283 288 1992 1549350

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Authors
Lito, P., Solomon, M., Li, L.-S., Hansen, R., & Rosen, N.
Affiliations
  • Memorial Sloan Kettering Cancer Center (US)
  • Wellspring Biosciences (United States) (US)
Corresponding author
  • Lito, Piro
  • Rosen, Neal
Venue
Science
Published
2016-02-05
Volume
351
Issue
6273
Pages
604-608
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W2233032895
Cited by
691
References
38
Citations by year
2026: 53 · 2025: 62 · 2024: 69 · 2023: 75 · 2022: 86 · 2021: 92 · 2020: 71 · 2019: 58 · 2018: 47 · 2017: 49 · 2016: 29
FWCI
31.89
Type
journal article
Language
en
Open access
Locations
  • Science (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health (P01CA129243-06, K08CA191082-01A1)
  • Memorial Sloan Kettering Cancer Center Experimental Therapeutics (SKI12103)
  • LUNGevity Foundation Career Development Award
  • V Foundation
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Tyrosine Phosphatases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Melanoma and MAPK Pathways
Keywords
KRAS G12C, GTPase activity, nucleotide exchange, KRAS-driven cancers, tyrosine kinase signaling, tumor cell growth inhibition
MeSH terms
Adenocarcinoma of Lung, Adenocarcinoma, Alleles, Antineoplastic Agents, Azetidines, Cysteine, Cytidine Diphosphate, Enzyme Inhibitors, Glycine, Guanosine Triphosphate, Humans, Lung Neoplasms, Mutation, Piperazines, Protein Conformation, Time Factors, Proto-Oncogene Proteins p21(ras), Cell Line, Tumor, HEK293 Cells, Molecular Targeted Therapy

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