{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nTyrosyl‑DNA phosphodiesterase 1 (TDP1) is a highly conserved DNA repair enzyme that catalyzes the hydrolysis of the 3′‑phosphodiester bond linking a tyrosyl moiety—derived from trapped topoisomerase I (Top1)–DNA complexes—to the DNA terminus. Structural and biochemical studies have revealed that TDP1 belongs to the phospholipase D superfamily, employing two conserved HKD motifs for its catalytic mechanism. Mutations in key active‐site residues (for example, the H493R change) compromise catalytic function and lead to the neurodegenerative disorder spinocerebellar ataxia with axonal neuropathy (SCAN1). In addition, comparative analyses have highlighted that TDP1 functions in tandem with related enzymes such as TDP2 to process topoisomerase–DNA adducts."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "7"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond processing stalled Top1–DNA complexes, TDP1 exhibits a broad substrate specificity that extends to various 3′ blocking lesions. It efficiently removes oxidative damage–induced 3′‑phosphoglycolates, cleaves abasic site linkages, and excises chain‑terminating nucleosides from both nuclear and mitochondrial DNA. Kinetic and binding studies indicate that TDP1 preferentially targets single‑stranded or blunt‑ended DNA substrates, and biochemical analyses show its involvement in multiple repair pathways—including base excision repair, non‑homologous end joining, and even mitochondrial DNA repair. Moreover, recent work has demonstrated that TDP1 can resolve protein–DNA cross‑links generated by aberrant topoisomerase activity, underscoring its versatility in maintaining genomic integrity."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "8", "end_ref": "18"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nTDP1 function is further modulated by an array of post‑translational modifications that influence its stability, subcellular localization, and interactions with key repair partners. Phosphorylation by ATM and DNA‑PK, SUMOylation, and arginine methylation have all been reported to promote TDP1 recruitment to DNA damage sites and to enhance its interactions with factors such as XRCC1, Ligase III, Ku, and XLF. These regulatory events have profound implications for cellular responses to Top1 poisons and other genotoxic agents, with altered TDP1 expression or catalytic trapping of TDP1–DNA intermediates modulating sensitivity to anticancer therapies. Recent fragment‑based screening campaigns and studies with natural product derivatives (for example, usnic acid analogues) underscore the emerging potential of TDP1 as a therapeutic target, especially in tumors exhibiting reliance on TDP1‑mediated repair. Collectively, these findings highlight the central role of TDP1 in coordinating repair of both nuclear and mitochondrial DNA damage and its promise as a modulator of therapeutic responses."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "19", "end_ref": "34"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "J J Pouliot, K C Yao, C A Robertson, et al. 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