6-Ethynylthieno[3,2-d]- and 6-ethynylthieno[2,3-d]pyrimidin-4-anilines as tunable covalent modifiers of ErbB kinases.

Wood ER, Shewchuk LM, Ellis B, Brignola P, Brashear RL, Caferro TR, Dickerson SH, Dickson HD, Donaldson KH, Gaul M, Griffin RJ, Hassell AM, Keith B, Mullin R, Petrov KG, Reno MJ, Rusnak DW, Tadepalli SM, Ulrich JC, Wagner CD, Vanderwall DE, Waterson AG, Williams JD, White WL, Uehling DE
Proc Natl Acad Sci U S A. 2008 105 (8): 2773-8

PMID: 18287036 · PMCID: PMC2268535 · DOI:10.1073/pnas.0708281105

Analysis of the x-ray crystal structure of mono-substituted acetylenic thienopyrimidine 6 complexed with the ErbB family enzyme ErbB-4 revealed a covalent bond between the terminal carbon of the acetylene moiety and the sulfhydryl group of Cys-803 at the solvent interface. The identification of this covalent adduct suggested that acetylenic thienopyrimidine 6 and related analogs might also be capable of forming an analogous covalent adduct with EGFR, which has a conserved cysteine (797) near the ATP binding pocket. To test this hypothesis, we treated a truncated, catalytically competent form of EGFR (678-1020) with a structurally related propargylic amine (8). An investigation of the resulting complex by mass spectrometry revealed the formation of a covalent complex of thienopyrimidine 8 with Cys-797 of EGFR. This finding enabled us to readily assess the irreversibility of various inhibitors and also facilitated a structure-activity relationship understanding of the covalent modifying potential and biological activity of a series of acetylenic thienopyrimidine compounds with potent antitumor activity. Several ErbB family enzyme and cell potent 6-ethynyl thienopyrimidine kinase inhibitors were found to form covalent adducts with EGFR.

MeSH Terms (18)

Alkynes Aniline Compounds Animals Cell Proliferation Crystallography, X-Ray Dose-Response Relationship, Drug ErbB Receptors Female Isatin Mass Spectrometry Mice Mice, SCID Models, Molecular Molecular Structure Pyrimidines Receptor Protein-Tyrosine Kinases Structure-Activity Relationship Xenograft Model Antitumor Assays

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