WAC interacts with RNF20/40 through its C-terminal coiled-coil region and promotes RNF20/40 s E3 ligase activity for H2B ubiquitination []. Drosophila WAC, also known as Wacky, promotes the interaction between TTT and Pontin/Reptin, thereby promoting mTORC1 activity by facilitating mTORC1 dimerization and mTORC1-Rag interaction [].
This entry represents a domain found in a group of microsporidia-specific proteins of unknown function. There is the possibility of very distant homology to the WAC domain.
ACF (for ATP-utilising chromatin assembly and remodeling factor) is a chromatin-remodeling complex that catalyzes the ATP-dependent assembly of periodic nucleosome arrays. This reaction utilises the energy of ATP hydrolysis by ISWI, the smaller of the two subunits of ACF. Acf1, the large subunit of ACF, is essential for the full activity of the complex. The WAC (WSTF/Acf1/cbp146) domain is an ~110-residue module present at the N-termini of Acf1-related proteins in a variety of organisms.It is found in association with other domains such as the bromodomain, the PHD-type zinc finger, DDT or WAKS. The DNA-binding region of Acf1 includes the WAC domain, which is necessary for the efficient binding of ACF complex to DNA. It seems probable that the WAC domain will be involved in DNA binding in other related factors [, ]. Some proteins known to contain a WAC domain are the Drosophila melanogaster (Fruit fly) ATP-dependent chromatin assembly factor large subunit Acf1, human WSTF (Williams syndrome transcription factor), mouse cbp146, yeast imitation switch two complex protein 1 (ITC1 or YGL133w), and yeast protein YPL216w.
Deubiquitinating protein VCPIP1, also known as VCIP135, is required for the p97/p47 and p97/p37 pathways and is involved in Golgi and ER membrane fusion. It reverses ubiquitination events that occurs during mitotic disassembly, regulating Golgi membrane dynamics during mitosis. This entry represents the N-terminal domain that interacts with WAC (the WW domain-containing adaptor with coiled coil). This interaction increases the deubiquitinating activity of VCPIP1 and is necessary for p97/p47-mediated Golgi membrane fusion [, ].
