{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nUBE2I, which encodes the sole SUMO‐conjugating enzyme Ubc9, is central to the post‐translational modification process called SUMOylation. Through a conserved mechanism akin to ubiquitination, Ubc9 transfers the small ubiquitin‐like modifier (SUMO) onto specific lysine residues of a wide variety of substrate proteins. This modification alters targets’ activity, stability, subcellular localization, or protein–protein interactions and is essential for a spectrum of cellular functions including regulation of nuclear transport, transcriptional control, apoptosis, and responses to cellular stress. Structural and biochemical studies have revealed that Ubc9 binds directly to SUMO proteins and interacts with multiple E3 ligases—such as Nup358/RanBP2—to optimally position its thioester‐linked SUMO for efficient conjugation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "12"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond acting as a mere “SUMO donor,” UBE2I/Ubc9 is subject to multiple levels of regulation that fine‐tune SUMO conjugation. Its substrate discrimination can be modulated through auto‐modification events—for example, autoSUMOylation of Ubc9 alters its ability to engage distinct targets—and by its association with accessory proteins such as RSUME, which enhances SUMO binding and thioester formation. In addition, post‐translational modifications of Ubc9 (including phosphorylation, acetylation, and redox‐dependent modifications) regulate interactions with transcriptional regulators and nuclear receptors (for instance, affecting factors such as Elk-1, COUP-TF, and the mineralocorticoid receptor), thereby influencing nuclear retention, transcriptional output, and protein stability."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "13", "end_ref": "27"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAberrant regulation of UBE2I/Ubc9 has been implicated in a variety of pathological conditions. Elevated expression and altered activity of Ubc9 have been observed in cancers of the breast, ovary, lung, melanoma, and glioma where they correlate with aggressive tumor behavior, chemoresistance, apoptosis evasion, and enhanced metastasis. In parallel, several oncogenic viruses (including human papillomavirus, Epstein–Barr virus, SARS-CoV, and adenovirus) exploit Ubc9 to reprogram host SUMOylation, thereby modulating the stability and function of both viral and cellular proteins. Emerging data also link Ubc9 function to KRAS-driven transformation and even to metabolic adaptations such as adipocyte browning. Collectively, these studies indicate that defects in UBE2I-driven SUMOylation contribute to tumor progression, virus-induced cellular transformation, and resistance to therapy, highlighting UBE2I as a potential target for therapeutic intervention."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "28", "end_ref": "40"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Donghai Lin, Michael H Tatham, Bin Yu, et al. 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