This family includes the Septation protein etd1 from Schizosaccharomyces pombe, which activates the GTPase Spg1 to trigger signaling through the septum initiation network (SIN) pathway and onset of cytokinesis. The proper regulation of Etd1 is crucial for both activation of Spg1 in anaphase and inactivation of Spg1 when cytokinesis is complete [1]. It was suggested that Etd1 is the functional homologue of budding yeast Lte1 as they have the same function but a very low sequence similarity [1].

1: Proper timing of cytokinesis is regulated by Schizosaccharomyces pombe Etd1. Garcia-Cortes JC, McCollum D; J Cell Biol. 2009;186:739-753. PMID:19736319