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Molecular insight into the T798M gatekeeper mutation-caused acquired resistance to tyrosine kinase inhibitors in ErbB2-positive breast cancer

Published: 01 February 2019 Publication History

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Molecular mechanism of T798M-caused drug resistance in ErbB2-positive breast cancer therapy is investigated.
Mutation-introduced hindrance effect is responsible for the acquired resistance to wide type-selective inhibitors.
Mutation can form additional nonbonded interactions with wide type-sparing inhibitors.
A S-involving halogen bond between Bosutinib and the sulfide group of Met798 residue is observed.

Abstract

Human epidermal growth factor receptor 2 (ErbB2) is an attractive therapeutic target for metastatic breast cancer. The kinase has been clinically observed to harbor a gatekeeper mutation T798M in its active site, which causes acquired resistance to the first-line targeted breast cancer therapy with small-molecule tyrosine kinase inhibitors. Previously, several theories have been proposed to explain the molecular mechanism of gatekeeper mutation-caused drug resistance, such as blocking of inhibitor binding and increasing of ATP affinity. In the current study, the direct binding of three wild type-selective inhibitors (Lapatinib, AEE788 and TAK-285) and two wild type-sparing inhibitors (Staurosporine and Bosutinib) to the wild-type ErbB2 and its T798M mutant are investigated in detail by using rigorous computational analysis and binding affinity assay. Substitution of the polar threonine with a bulky methionine at residue 798 can impair and improve the direct binding affinity of wild type-selective and wild type-sparing inhibitors, respectively. Hindrance effect is responsible for the affinity decrease of wild type-selective inhibitors, while additional nonbonded interactions contribute to the affinity increase of wild type-sparing inhibitors, thus conferring selectivity to the inhibitors for mutant over wild type. The binding affinity of Staurosporine and Bosutinib to ErbB2 kinase domain is improved by 11.9-fold and 2.1-fold upon T798M mutation, respectively. Structural analysis reveals that a nonbonded network of S–π contact interactions (for Staurosporine) or an S-involving halogen bond (for Bosutinib) forms with the sulfide group of mutant Met798 residue.

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          cover image Computational Biology and Chemistry
          Computational Biology and Chemistry  Volume 78, Issue C
          Feb 2019
          513 pages

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          Elsevier Science Publishers B. V.

          Netherlands

          Publication History

          Published: 01 February 2019

          Author Tags

          1. Epidermal growth factor receptor 2
          2. Gatekeeper mutation
          3. Tyrosine kinase inhibitor
          4. Acquired resistance
          5. Breast cancer

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