{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n Heparan sulfate glucosaminyl 3‐O‐sulfotransferase 2 (HS3ST2) is a key enzyme that catalyzes the 3‐O‐sulfation of heparan sulfate chains, thereby generating rare sulfated motifs that modulate protein interactions at the cell surface and in the extracellular matrix. In several epithelial malignancies—including esophageal adenocarcinoma, gastric cancer, and non‐small cell lung cancer—aberrant hypermethylation of the HS3ST2 promoter is frequently observed, leading to its silencing; such epigenetic inactivation has been associated with early neoplastic progression and poorer clinical outcomes, suggesting that HS3ST2 may function as a tumor suppressor in these contexts."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "5"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In contrast, within the nervous system HS3ST2 is predominantly expressed in neurons and plays a critical role in generating specific 3‐O‐sulfated heparan sulfate domains. These unique modifications not only serve as binding sites for proteins such as the herpes simplex virus glycoprotein D, as seen in studies of neural 3‐OST isoforms"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": ", but they have also been implicated in the pathogenesis of tauopathies. In Alzheimer’s disease models, for example, the HS3ST2‐generated 3‐O‐sulfated heparan sulfates are internalized by neurons where they interact with tau protein, thus promoting its abnormal phosphorylation and contributing to neurofibrillary pathology."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Furthermore, HS3ST2 has been identified as a target of microRNA‐mediated regulation in tumor cells; its de-repression upon antagonism of miR‐100 activates Notch‐linked apoptotic pathways, thereby influencing cellular fate in gastric cancer."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": " In addition, studies of enzyme subcellular localization have revealed that, unlike other 3‐O‐sulfotransferase isoforms that remain confined to the Golgi apparatus, HS3ST2 can be targeted to the plasma membrane through interactions with syndecan‑2. This specific cell surface localization is thought to be important for its role in modulating extracellular signals and cell adhesion."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Finally, biochemical analyses in various tissues have demonstrated that HS3ST2, along with other relevant isoforms, contributes to the synthesis of distinct di‑sulfated disaccharide units in heparan sulfate that are differentially distributed among tissues, further underscoring its tissue‑specific and multifaceted functions."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Collectively, these findings establish HS3ST2 as a multifunctional enzyme whose epigenetic regulation, subcellular localization, and unique sulfation activity are critical for maintaining normal cellular signaling in the nervous system and for suppressing tumorigenesis in epithelial tissues."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}, {"type": "fg_f", "ref": "7"}, {"type": "fg_f", "ref": "3"}, {"type": "fg_f", "ref": "6"}, {"type": "fg_f", "ref": "8"}, {"type": "fg_f", "ref": "4"}, {"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": "\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Karsten Schulmann, Anca Sterian, Agnes Berki, et al. 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