Component of a deubiquitination module (DUB module) that specifically deubiquinates monoubiquinated histone H2B (H2Bub) (PubMed:29588169, PubMed:30192741). Does not seem to be a component of the TREX-2 complex (PubMed:29588169). Seems to act independently of the SAGA multiprotein complex (PubMed:30192741). The DUB module is responsible for the major H2Bub deubiquitinase activity in Arabidopsis (PubMed:30192741). Component of a deubiquitination module (DUB module) formed by ENY2, SGF11, and UBP22 in Arabidopsis (PubMed:29588169, PubMed:30192741). Interacts directly with ENY2 and UBP22 (PubMed:29588169, PubMed:30192741). Interacts with DDA1 (PubMed:30192741). Displays a rather patchy distribution forming a punctuated pattern in the euchromatin (PubMed:30192741). Does not localize in the heterochromatic chromocenters or nucleolus (PubMed:30192741). Ubiquitinated in DET1-dependent manner (PubMed:30192741). Ubiquitination probably leads to its subsequent proteasomal degradation (PubMed:30192741). Delayed flowering and increased levels of histone H2B monoubiquitination. Belongs to the SGF11 family.