This domain is found at the C-terminal end of a group of animal zinc finger FYVE domain-containing proteins, including Smad anchor for receptor activation (SARA), which plays a significant role in TGF-mediated signalling. This domain is involved in the interaction with the TGF-beta receptor [1,2]. This domain is found associated with Pfam:PF01363.

1: SARA, a FYVE domain protein that recruits Smad2 to the TGFbeta receptor. Tsukazaki T, Chiang TA, Davison AF, Attisano L, Wrana JL; Cell. 1998;95:779-791. PMID:9865696

2: Structural basis of Smad2 recognition by the Smad anchor for receptor activation. Wu G, Chen YG, Ozdamar B, Gyuricza CA, Chong PA, Wrana JL, Massague J, Shi Y; Science. 2000;287:92-97. PMID:10615055