{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSUMO2, one of the members of the small ubiquitin‐related modifier family, functions as a versatile regulator of protein activity by covalently modifying a broad spectrum of substrates. Structural and biochemical investigations have revealed that SUMO2 possesses distinct binding surfaces and interacts with defined SUMO‐interacting motifs that enable selective recognition of target proteins. High‐resolution studies of its conjugation and processing—with proteases such as SENP1—and mass spectrometry–based proteomic approaches have mapped numerous SUMO2 acceptor lysines on transcriptional regulators and chromatin‐associated factors. These insights underscore a pivotal role for SUMO2 in dictating subcellular localization and stabilizing oncogenic factors."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "9"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn response to various cellular stresses, SUMO2 conjugation is rapidly up‐regulated to fine‐tune the transcriptional programs that control stress adaptation. For example, SUMO2 modification of key transcription factors such as heat shock factor 1, the tumor suppressor p53, nuclear receptor RORα, and components of the activator protein‐1 complex adjusts their transcriptional potency, subnuclear distribution, and interactions with corepressor complexes (e.g. via CoREST1). In addition, cofactors like heat shock protein 27 modulate these modifications to impose feedback regulation, thereby ensuring a balanced cellular stress response."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "10", "end_ref": "14"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its role in stress adaptation, SUMO2 is integral to the maintenance of genome stability, cell cycle progression, and the orchestration of innate immune responses. In mitosis, SUMO2/3 localizes to centromeres and condensed chromosomes to facilitate proper kinetochore function and the regulation of architectural proteins such as CTCF and transcription factors like FoxM1. SUMO2 also modulates immune regulators by conjugating to distinct forms of interferon‐responsive factors—including IRF7 and IRF8—to influence interferon production while, in parallel, mediating responses to DNA damage through targeting repair scaffolds (for example, SLX4) and replication factors such as PCNA that resolve transcription–replication conflicts. 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