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Updated: May 22, 2025

A Method for Screening and Validation of Resistant Mutations Against Kinase Inhibitors
12:40

A Method for Screening and Validation of Resistant Mutations Against Kinase Inhibitors

Published on: December 7, 2014

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USP7 V517F mutation as a mechanism of inhibitor resistance

Yu-Ling Miao1, Fengying Fan2,3, Yong-Jun Cheng1

  • 1State Key Laboratory of Drug Research, Cancer Research Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 501 Haike Road, Shanghai, 201203, China.

Nature Communications
|March 15, 2025
PubMed

Insights

A specific mutation (V517F) in USP7 causes resistance to USP7 inhibitors by altering the drug binding site. Understanding this mechanism is key for developing new cancer therapies.

Area of Science:

  • Oncology
  • Molecular Biology
  • Drug Discovery

Background:

  • Developing targeted cancer therapies requires anticipating and overcoming drug resistance.
  • USP7 inhibitors represent a promising class of oncology drugs, but resistance mechanisms need elucidation.

Purpose of the Study:

  • To proactively identify resistance mechanisms against USP7 inhibitors.
  • To characterize the structural and functional impact of mutations conferring resistance to USP7 inhibitors.

Main Methods:

  • Utilized structural analysis and AlphaFold2 predictions to investigate USP7 mutations.
  • Employed biochemical assays to assess binding affinity between USP7 variants and inhibitors.
  • Generated and tested engineered cell lines harboring specific USP7 mutations.

Main Results:

  • Identified a treatment-emergent heterozygous mutation, V517F in USP7, as a primary cause of resistance to USP7-797.
  • Structural analysis revealed V517F alters the binding pocket conformation, leading to steric hindrance and reduced inhibitor affinity.
  • Engineered cell lines with V517F mutation demonstrated significant resistance to USP7 inhibition, while smaller substitutions showed minimal impact.

Conclusions:

  • The V517F mutation in USP7 confers resistance to USP7 inhibitors through steric hindrance in the binding pocket.
  • These findings support patient stratification strategies and the development of next-generation USP7 inhibitors to overcome resistance mutations.

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