UBE2E2 is a ubiquitin-conjugating enzyme (E2) that catalyzes the transfer of ubiquitin to target proteins in an E1-dependent manner 1. The enzyme facilitates multiple ubiquitination linkage types (Lys-11, Lys-48, and Lys-63) and mediates ISGylation of viral proteins 2. UBE2E2 contains a conserved UBC domain with an active site cysteine (Cys139) critical for catalytic function 3. In pancreatic β-cells, UBE2E2 regulates glucose homeostasis through ubiquitin-mediated protein modifications. Overexpression of UBE2E2 in β-cell-transgenic mice reduces β-cell mass and impairs glucose tolerance by suppressing β-cell proliferation and increasing p21 expression 4. In adipogenesis, loss of Ube2e2 function impairs adipocyte differentiation 5. UBE2E2 is associated with type 2 diabetes susceptibility; diabetes risk alleles correlate with elevated pancreatic UBE2E2 mRNA expression 4. Noncoding variation near UBE2E2 influences cardiometabolic phenotypes through polygenic regulatory effects on both UBE2E2 and neighboring genes including UBE2E1 6. In ovarian cancer, UBE2E2 promotes epithelial-mesenchymal transition and metastasis by stabilizing Snail through direct interaction with Nrf2 and inhibition of Snail ubiquitination 3.