Hgs (Hrs), a FYVE domain protein, is involved in Smad signaling through cooperation with SARA

S. Miura, T. Takeshita, H. Asao, Y. Kimura, K. Murata, Y. Sasaki, J. I. Hanai, H. Beppu, T. Tsukazaki, J. L. Wrana, K. Miyazono, K. Sugamura

Research output: Contribution to journalArticlepeer-review

148 Citations (Scopus)


Smad proteins are effector molecules that transmit signals from the receptors for the transforming growth factor β (TGF-β) superfamily to the nucleus; of the Smad proteins, Smad2 and Smad4 are essential components for mouse early embryogenesis. We demonstrated that Hgs, a FYVE domain protein, binds to Smad2 in its C-terminal half and cooperates with another FYVE domain protein, the Smad anchor for receptor activation (SARA), to stimulate activin receptor-mediated signaling through efficient recruitment of Smad2 to the receptor. Furthermore, a LacZ knock-in allele of the C-terminal half-deletion mutant of mouse Hgs was created by gene targeting. The introduced mutation causes an embryonic lethality between embryonic days 8.5 and 10.5. Mutant cells showed significantly decreased responses to stimulation with activin and TGF-β. These findings suggest that the two FYVE domain proteins, Hgs and SARA, are prerequisites for receptor-mediated activation of Smad2.

Original languageEnglish
Pages (from-to)9346-9355
Number of pages10
JournalMolecular and cellular biology
Issue number24
Publication statusPublished - 2000

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology


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