{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nPAPSS2 is a bifunctional enzyme that catalyzes the formation of 3′‐phosphoadenosine‐5′‐phosphosulfate (PAPS), the unique and universal sulfate donor required for all sulfation reactions. Its activity is central to numerous biochemical processes, including the sulfation of steroids such as dehydroepiandrosterone (DHEA), extracellular matrix proteoglycans, and xenobiotic compounds. PAPSS2 displays isoform‐specific characteristics – for instance, its predominant cytoplasmic localization contrasts with that of the nuclear PAPSS1, and its activity is finely regulated by distinctive promoter elements and unique structural features (e.g., an unusual phenylalanine “flipping” mechanism in the ATP‐sulfurylase domain). Moreover, biochemical studies have demonstrated that PAPSS2 interacts directly with key sulfotransferases (e.g., SULT2A1), underscoring its selective role in processes such as androgen sulfation and phase II metabolism, including the bioactivation of toxic aristolactams."}, {"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": "\nGenetic and clinical investigations have revealed that PAPSS2 is critical for normal skeletal and cartilage development. Loss‐of‐function mutations in PAPSS2 are causative for a spectrum of brachyolmia and spondylo‐epimetaphyseal dysplasias, disorders characterized by short stature, spinal deformities, and abnormal epiphyseal or metaphyseal morphology. In addition, impaired sulfation due to PAPSS2 deficiency has been linked to osteoarthritic changes in cartilage metabolism. These findings underscore the enzyme’s importance in skeletal growth and joint homeostasis, as well as its potential role as a determinant in diverse chondrodysplasias."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "8", "end_ref": "13"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its roles in normal physiology, PAPSS2 has emerged as a contributor to various pathological conditions. In breast cancer, for example, oncogenic signals (mediated by the transcription factor Snail) can induce PAPSS2 expression, thereby enhancing chondroitin sulfate production and promoting tumor cell migration and metastasis. Similarly, altered PAPSS2 function has been implicated in colonic carcinogenesis and may serve as a genetic marker in prostate cancer recurrence through its impact on androgen metabolism. Intriguingly, recent genome‐wide association studies have also suggested links between PAPSS2 and traits as diverse as leisure time exercise behavior, serum magnesium homeostasis in children, and even longevity. Collectively, these observations highlight the diverse pathobiological contexts in which PAPSS2 function is relevant."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "14", "end_ref": "19"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Chikara Shimizu, Hirotoshi Fuda, Young C Lee, et al. 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