This family of proteins is predominantly found in Saccharomycetales, including YNR034W-A (also known as Ego4) and YCR075W-A (Ego2) from Saccharomyces cerevisiae. Ego2 is a component of the yeast EGO complex (EGOC), which is responsible for the amino acid-dependent activation of the target of rapamycin complex 1 (TORC1). Ego2 adopts a Roadblock domain fold that consists of a central core beta-sheet of five anti-parallel beta-strands flanked by a long alpha-helix on the bottom side. Ego4 shows a similar configuration. It interacts with the GTPase Gtr2, but its specific function remains unknown [1,2].

1: Structural insights into the EGO-TC-mediated membrane tethering of the TORC1-regulatory Rag GTPases. Zhang T, Peli-Gulli MP, Zhang Z, Tang X, Ye J, De Virgilio C, Ding J; Sci Adv. 2019;5:eaax8164. PMID:31579828

2: Crystal structure of the Ego1-Ego2-Ego3 complex and its role in promoting Rag GTPase-dependent TORC1 signaling. Powis K, Zhang T, Panchaud N, Wang R, De Virgilio C, Ding J; Cell Res. 2015;25:1043-1059. PMID:26206314