UBE2G2 is an ubiquitin-conjugating enzyme (E2) that accepts ubiquitin from E1 and catalyzes covalent attachment to target proteins, with particular specialization in K48-linked polyubiquitination 1. It is ubiquitously expressed, with high levels in muscle tissue, and is located on chromosome 21.3 2. UBE2G2 plays a critical role in endoplasmic reticulum-associated degradation (ERAD), particularly in sterol-induced ubiquitination of HMG-CoA reductase for subsequent proteasomal degradation 34. Beyond ERAD, UBE2G2 functions in lipophagy, contributing to selective autophagy of lipid droplets in macrophage foam cells, with potential therapeutic implications for atherosclerosis 5. Structurally, UBE2G2 exhibits dynamic catalytic loops near its active site cysteine that require interaction with cognate E3 ligases for optimal conformational positioning and catalytic activity 46. Recently, UBE2G2 was identified as a component of the AUP1 complex that negatively regulates STING signaling to maintain immune homeostasis 7. Disease associations include atherosclerosis, where UBE2G2 knockdown reduces atherosclerotic plaque formation and inflammatory markers in ApoE-deficient mice through miR-204-5p regulation 8.