Tyr-317 Phosphorylation Increases Shc Structural Rigidity and Reduces Coupling of Domain Motions Remote from the Phosphorylation Site as Revealed by Molecular Dynamics Simulations

Atsushi Suenaga, Anatoly B. Kiyatkin, Mariko Hatakeyama, Noriyuki Futatsugi, Noriaki Okimoto, Yoshinori Hirano, Tetsu Narumi, Atsushi Kawai, Ryutaro Susukita, Takahiro Koishi, Hideaki Furusawa, Kenji Yasuoka, Naoki Takada, Yousuke Ohno, Makoto Taiji, Toshikazu Ebisuzaki, Jan B. Hoek, Akihiko Konagaya, Boris N. Kholodenko

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27 Citations (Scopus)

Abstract

Activated receptor tyrosine kinases bind the Shc adaptor protein through its N-terminal phosphotyrosine-binding (PTB) and C-terminal Src homology 2 (SH2) domains. After binding, Shc is phosphorylated within the central collagen-homology (CH) linker region on Tyr-317, a residue remote to both the PTB and SH2 domains. Shc phosphorylation plays a pivotal role in the initiation of mitogenic signaling through the Ras/Raf/MEK/ERK pathway, but it is unclear if Tyr-317 phosphorylation affects Shc-receptor interactions through the PTB and SH2 domains. To investigate the structural impact of Shc phosphorylation, molecular dynamics simulations were carried out using special-purpose Molecular Dynamics Machine-Grape computers. After a 1-nanosecond equilibration, atomic motions in the structures of unphosphorylated Shc and Shc phosphorylated on Tyr-317 were calculated during a 2-nanosecond period. The results reveal larger phosphotyrosine-binding domain fluctuations and more structural flexibility of unphosphorylated Shc compared with phosphorylated Shc. Collective motions between the PTB-SH2, PTB-CH, and CH-SH2 domains were highly correlated only in unphosphorylated Shc. Dramatic changes in domain coupling and structural rigidity, induced by Tyr-317 phosphorylation, may alter Shc function, bringing about marked differences in the association of unphosphorylated and phosphorylated Shc with its numerous partners, including activated membrane receptors.

Original languageEnglish
Pages (from-to)4657-4662
Number of pages6
JournalJournal of Biological Chemistry
Volume279
Issue number6
DOIs
Publication statusPublished - 2004 Feb 6

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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    Suenaga, A., Kiyatkin, A. B., Hatakeyama, M., Futatsugi, N., Okimoto, N., Hirano, Y., Narumi, T., Kawai, A., Susukita, R., Koishi, T., Furusawa, H., Yasuoka, K., Takada, N., Ohno, Y., Taiji, M., Ebisuzaki, T., Hoek, J. B., Konagaya, A., & Kholodenko, B. N. (2004). Tyr-317 Phosphorylation Increases Shc Structural Rigidity and Reduces Coupling of Domain Motions Remote from the Phosphorylation Site as Revealed by Molecular Dynamics Simulations. Journal of Biological Chemistry, 279(6), 4657-4662. https://doi.org/10.1074/jbc.M310598200