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. 1994 Mar;85(3):253–259. doi: 10.1111/j.1349-7006.1994.tb02090.x

BE‐23372M, a Novel and Specific Inhibitor for Epidermal Growth Factor Receptor Kinase

Seiichi Tanaka 1, Takayoshi Okabe 1, Shinya Chieda 1, Kaori Endo 1, Tomoko Kanoh 1, Akira Okura 1, Eisaku Yoshida 1,✉
PMCID: PMC5919452  PMID: 8188523

Abstract

The fungal metabolite BE‐23372M is a structurally novel protein kinase inhibitor. Its IC50 for epidermal growth factor (EGF) receptor kinase was 0.03 μM. IC50 values of BE‐23372M for other protein tyrosine kinases, erbB‐2, p43v‐abl, insulin receptor kinase, and p60c‐src were 0.42, 1.0, 3.3, and 4.5 μM, respectively, and the IC50 for protein kinase C, a serine/threonine kinase, was 4.1 μM. Cdc2 kinase, casein kinases I and II and cAMP‐dependent protein kinase were not inhibited by 20 μM BE23372M. A kinetic study showed that BE‐23372M was competitive with respect to the substrate peptide and to ATP. Autophosphorylation of solubilized EGF receptor kinase was clearly inhibited by 0.1 μM BE‐23372M. Autophosphorylation of EGP receptor in A431 cells was also inhibited. These results show that BE‐23372M is a potent and specific EGF receptor kinase inhibitor. It should be a valuable tool for EGF receptor kinase research.

Keywords: EGF receptor, Protein tyrosine kinase, Inhibitor

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