Characterization of the interaction between Toxoplasma gondii rhoptry neck protein 4 and host cellular β-tubulin

Hitoshi Takemae, Tatsuki Sugi, Kyousuke Kobayashi, Haiyan Gong, Akiko Ishiwa, Frances C. Recuenco, Fumi Murakoshi, Tatsuya Iwanaga, Atsuko Inomata, Taisuke Horimoto, Hiroomi Akashi, Kentaro Kato

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24 Citations (Scopus)


Toxoplasma rhoptry neck protein 4 (TgRON4) is a component of the moving junction macromolecular complex that plays a central role during invasion. TgRON4 is exposed on the cytosolic side of the host cell during invasion, but its molecular interactions remain unclear. Here, we identified host cellular β-tubulin as a binding partner of TgRON4, but not Plasmodium RON4. Coimmunoprecipitation studies in mammalian cells demonstrated that the C-terminal 15-kDa region of β-tubulin was sufficient for binding to TgRON4, and that a 17-kDa region in the proximal C-terminus of TgRON4 was required for binding to the C-terminal region of β-tubulin. Analysis of T. gondii-infected lysates from CHO cells expressing the TgRON4-binding region showed that the C-terminal region of β-tubulin interacted with TgRON4 at early invasion step. Our results provide evidence for a parasite-specific interaction between TgRON4 and the host cell cytoskeleton in parasite-infected cells.

Original languageEnglish
Article number3199
JournalScientific reports
Publication statusPublished - 2013
Externally publishedYes

ASJC Scopus subject areas

  • General


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