E3 ubiquitin-protein ligase that mediates ubiquitination and subsequent proteasomal degradation of myosin regulatory light chain (MRLC) (By similarity). Regulates cell movements during gastrulation by acting downstream of fz7 to antagonize the frizzled-signaling pathway. 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 anxa5. Ubiquitous. Expression starts early during embryogenesis and is maintained through late embryogenesis and in the adult.