E3 ubiquitin-protein ligase that accepts ubiquitin from E2 ubiquitin-conjugating enzymes, such as ubc-18, in the form of a thioester and then directly transfers the ubiquitin to targeted substrates. Ubiquitinates ify-1 and cyb-1 targeting them for degradation in post-meiotic embryos. S-ubiquitinyl-[E2 ubiquitin-conjugating enzyme]-L-cysteine + [acceptor protein]-L-lysine = [E2 ubiquitin-conjugating enzyme]-L-cysteine + N(6)-ubiquitinyl-[acceptor protein]-L-lysine. Protein modification; protein ubiquitination. Interacts with ify-1 and cyb-1. RNAi-mediated knockdown causes a reduction in progeny viability. ify-1 and cyb-1 accumulate in the cytoplasm during meiosis II. Also extents the length of meiosis II and causes retention of rec-8, a component of the cohesin complex, at sister chromatid cohesion. Causes a delay in oocyte budding.