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Structural insights of the complex formed by KRAS G12V and a novel TIG3 peptide

Min Seon Ha1, Chang Woo Han2, Mi Suk Jeong2

  • 1Department of Molecular Biology, College of Natural Sciences, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Republic of Korea.

Biochimica Et Biophysica Acta. Proteins and Proteomics
|August 2, 2025
PubMed

Insights

Researchers developed a novel peptide from TIG3 protein that targets KRAS G12V mutations in pancreatic cancer. This peptide shows potential as a KRAS inhibitor, offering new therapeutic avenues for pancreatic ductal adenocarcinoma.

Area of Science:

  • Oncology
  • Molecular Biology
  • Structural Biology

Background:

  • Pancreatic cancer has a poor prognosis, with KRAS mutations being common and crucial therapeutic targets.
  • The KRAS protein's structure poses significant challenges for developing effective anti-cancer drugs.
  • Type II tumor suppressors, like TIG3, are being explored for novel therapeutic strategies.

Purpose of the Study:

  • To develop and characterize a novel peptide inhibitor targeting KRAS G12V mutations.
  • To investigate the binding mechanism and structural impact of the peptide on KRAS G12V.
  • To evaluate the therapeutic potential of the TIG3-derived peptide in KRAS G12V-mutated cancer cells.

Main Methods:

  • Peptide development from TIG3 protein.
  • Binding affinity assays to confirm interaction with KRAS G12V.
  • X-ray crystallography to determine the peptide-KRAS G12V complex structure.
  • Cell viability assays on cancer cell lines harboring KRAS G12V.

Main Results:

  • A novel peptide derived from TIG3 demonstrated moderate affinity binding to KRAS G12V.
  • X-ray crystallography revealed peptide binding near the Switch II domain, inducing conformational changes in KRAS G12V.
  • The peptide significantly reduced the viability of cancer cell lines with KRAS G12V mutations.

Conclusions:

  • The novel TIG3-derived peptide is a promising candidate for KRAS G12V-targeted cancer therapy.
  • The study provides crucial structural insights for developing therapeutics against pancreatic ductal adenocarcinoma.
  • This peptide represents a potential new strategy for targeting KRAS-driven malignancies.
Keywords:
KRAS G12V mutantPeptidesTIG3X-ray crystallography

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