Molecular Basis for Redox Activation of Epidermal Growth Factor Receptor Kinase

Thu H. Truong, Peter Man Un Ung, Prakash B. Palde, Candice E. Paulsen, Avner Schlessinger, Kate S. Carroll

Research output: Contribution to journalArticlepeer-review

88 Scopus citations

Abstract

Epidermal growth factor receptor (EGFR) is a target of signal-derived H2O2, and oxidation of active-site cysteine 797 to sulfenic acid enhances kinase activity. Although a major class of covalent drugs targets C797, nothing is known about its catalytic importance or how S-sulfenylation leads to activation. Here, we report the first detailed functional analysis of C797. In contrast to prior assumptions, mutation of C797 diminishes catalytic efficiency in vitro and cells. The experimentally determined pKa and reactivity of C797 toward H2O2 correspondingly distinguish this residue from the bulk of the cysteinome. Molecular dynamics simulation of reduced versus oxidized EGFR, reinforced by experimental testing, indicates that sulfenylation of C797 allows new electrostatic interactions to be formed with the catalytic loop. Finally, we show that chronic oxidative stress yields an EGFR subpopulation that is refractory to the FDA-approved drug afatinib. Collectively, our data highlight the significance of redox biology to understanding kinase regulation and drug pharmacology.

Original languageEnglish (US)
Pages (from-to)837-848
Number of pages12
JournalCell Chemical Biology
Volume23
Issue number7
DOIs
StatePublished - Jul 21 2016
Externally publishedYes

Bibliographical note

Funding Information:
We thank Crystal Yan for technical assistance. This work was supported by the NIH grants GM102187 (K.S.C.), CA174986 (K.S.C.), and R01 GM108911 (A.S. and P.M.-U.U.) and in part through computational resources and staff expertise provided by the Department of Scientific Computing at the Icahn School of Medicine at Mount Sinai (P.M.-U.U. and A.S.).

Publisher Copyright:
© 2016 Elsevier Ltd

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