RESUMO
Aberrant signaling of ErbB family members human epidermal growth factor 2 (HER2) and epidermal growth factor receptor (EGFR) is implicated in many human cancers, and HER2 expression is predictive of human disease recurrence and prognosis. Small molecule kinase inhibitors of EGFR and of both HER2 and EGFR have received approval for the treatment of cancer. We present the first high resolution crystal structure of the kinase domain of HER2 in complex with a selective inhibitor to understand protein activation, inhibition, and function at the molecular level. HER2 kinase domain crystallizes as a dimer and suggests evidence for an allosteric mechanism of activation comparable with previously reported activation mechanisms for EGFR and HER4. A unique Gly-rich region in HER2 following the α-helix C is responsible for increased conformational flexibility within the active site and could explain the low intrinsic catalytic activity previously reported for HER2. In addition, we solved the crystal structure of the kinase domain of EGFR in complex with a HER2/EGFR dual inhibitor (TAK-285). Comparison with previously reported inactive and active EGFR kinase domain structures gave insight into the mechanism of HER2 and EGFR inhibition and may help guide the design and development of new cancer drugs with improved potency and selectivity.
Assuntos
Receptor ErbB-2/química , Regulação Alostérica/efeitos dos fármacos , Regulação Alostérica/genética , Antineoplásicos/química , Antineoplásicos/uso terapêutico , Cristalografia por Raios X , Desenho de Fármacos , Ativação Enzimática/efeitos dos fármacos , Ativação Enzimática/genética , Receptores ErbB/química , Receptores ErbB/genética , Receptores ErbB/metabolismo , Humanos , Neoplasias/tratamento farmacológico , Neoplasias/enzimologia , Neoplasias/genética , Inibidores de Proteínas Quinases/química , Inibidores de Proteínas Quinases/uso terapêutico , Estrutura Terciária de Proteína , Receptor ErbB-2/antagonistas & inibidores , Receptor ErbB-2/genética , Receptor ErbB-2/metabolismo , Receptor ErbB-4 , Relação Estrutura-AtividadeRESUMO
[This corrects the article DOI: 10.1021/acsmedchemlett.6b00481.].
RESUMO
Apoptosis signal-regulating kinase 1 (ASK1/MAP3K) is a mitogen-activated protein kinase family member shown to contribute to acute ischemia/reperfusion injury. Using structure-based drug design, deconstruction, and reoptimization of a known ASK1 inhibitor, a lead compound was identified. This compound displayed robust MAP3K pathway inhibition and reduction of infarct size in an isolated perfused heart model of cardiac injury.