Tyr-863 phosphorylation enhances focal adhesion kinase autophosphorylation at Tyr-397

Tzeng Horng Leu, Ming Chei Maa

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32 Citations (Scopus)


Tyr-397 phosphorylation is important for focal adhesion kinase (FAK)-mediated signalling. In vitro FAK immunocomplex kinase experiments demonstrated that both FAK Tyr-576/577 and Tyr-863 phosphorylation regulated FAK Tyr-397 phosphorylation. While the former increased the intermolecular transphosphorylation activity of FAK, the latter was crucial for its cis-phosphorylation. This observation was further supported by the reduced complex formation between Src and 3F-FAK (576F/577F/863F-FAK) as compared to that between Src and 576F/577F-FAK or Src and 863F-FAK. Regulation of cis- and transphosphorylation activities of FAK by such a differential tyrosyl phosphorylation mechanism is unprecedented. Furthermore, in fibronectin-stimulated cells, both Tyr-576/577 and Tyr-863 phosphorylation could enhance FAK Tyr-397 phosphorylation. This observation implies that integrin-mediated FAK Tyr-397 phosphorylation was also regulated through both FAK cis- and transphosphorylation mechanisms.

Original languageEnglish
Pages (from-to)6992-7000
Number of pages9
Issue number46
Publication statusPublished - 2002 Jan 1

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Genetics
  • Cancer Research

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