{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRNF111, also known as Arkadia, is a RING‐domain E3 ubiquitin ligase that functions as a potent positive regulator of transforming growth factor–β (TGF–β) superfamily signaling. By ubiquitinating inhibitory factors—such as Smad7, SnoN, and c‐Ski—RNF111 relieves negative feedback and thereby amplifies TGF–β–induced transcriptional responses. This enhancement of signaling is critical for processes like epithelial-to-mesenchymal transition and other differentiation events."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "4"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nRNF111 also plays an essential role during early embryonic development. It is required for proper node formation and mesendoderm induction—processes that underlie embryonic axis formation and the maintenance of anterior structures—thereby linking its ubiquitin ligase activity to developmental patterning."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its classical role in TGF–β signaling, RNF111 functions as a SUMO‐targeted ubiquitin ligase (STUbL). By employing multiple SUMO-interacting motifs, it specifically recognizes poly–SUMO2/3 chains and facilitates nonproteolytic K63-linked ubiquitination of substrates such as the damage recognition factor XPC. RNF111 is also implicated in the regulation of neddylation events, thereby integrating SUMO and ubiquitin signaling in the cellular response to DNA damage."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "11"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn the oncogenic context, RNF111 exhibits context-dependent roles. On one hand, its ability to remove transcriptional repressors may restore or potentiate tumor-suppressive TGF–β responses—impeding proliferation and soft agar growth—whereas in other settings, particularly in lung and colorectal cancers, altered RNF111 function is associated with enhanced metastatic behavior. Cooperative interactions with additional cofactors further refine its impact on tumor progression."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "12", "end_ref": "18"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nHigh-resolution structural and mechanistic studies have provided critical insights into RNF111 function. Its RING domain not only recruits the E2 ubiquitin-conjugating enzyme but also directly binds free ubiquitin—stabilizing the E2∼ubiquitin conjugate in a ‘closed’ conformation optimized for ubiquitin transfer. In addition, a series of SUMO-interacting motifs and a unique M domain guide substrate recognition and dictate the assembly of specific polyubiquitin chains."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "19", "end_ref": "22"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nRNF111 further intersects with receptor-mediated pathways by interacting with components of the clathrin-adaptor complex. This interaction promotes the ubiquitination of proteins involved in endocytosis, thereby regulating the internalization and turnover of receptors such as the epidermal growth factor receptor (EGFR) and contributing to the fine-tuning of signal transduction."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "23"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nThe activity of RNF111 is also linked to tissue remodeling and fibrosis. In fibrotic conditions, such as those affecting the liver and heart, altered RNF111 expression and activity modulate the degradation of transcriptional repressors, thereby impacting TGF–β–driven extracellular matrix synthesis and the overall balance between tissue repair and pathological fibrosis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "24"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nEmerging evidence further implicates RNF111 in the regulation of alternative splicing, with important ramifications for tumor suppression. In clear-cell renal cell carcinoma, RNF111 interacts with key splicing regulators to modulate exon inclusion events, and this cooperative axis appears to counteract tumor growth."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "26"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFinally, RNF111 is critical for reproductive biology. Deleterious monoallelic variants in RNF111 compromise its E3 ligase function and disrupt TGF–β/BMP signaling within the ovary, leading to a reduced ovarian reserve and premature ovarian insufficiency. These findings underscore its essential role in female fertility."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "27"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Daizo Koinuma, Masahiko Shinozaki, Akiyoshi Komuro, et al. 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