{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nHuman SULT1A3 is a critical cytosolic sulfotransferase that catalyzes the sulfate conjugation of catecholamines—most notably dopamine—as well as structurally related drugs. As a member of the broader SULT enzyme family that mediates phase II metabolism of both xenobiotics and endogenous compounds, SULT1A3 exhibits unique substrate specificity and stereoselectivity. Its catalytic efficiency depends on key active‐site residues and is markedly enhanced by divalent metal ions (e.g., Mn²⁺), while genetic variants and gene duplication with its paralog SULT1A4 contribute to considerable interindividual variability in enzyme activity and protein stability."}, {"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": "\nAt the genetic and transcriptional levels, SULT1A3 is subject to regulation that markedly impacts its metabolic role. Several studies have identified nonsynonymous single nucleotide polymorphisms (cSNPs) that alter protein stability, substrate affinity, and catalytic efficiency, thereby affecting the sulfonation of catecholamines and chiral drug substrates. In addition, hormonal cues—such as those mediated by glucocorticoids—as well as bile acid–activated receptors like FXR, have been shown to modulate SULT1A3 expression in various tissues including liver, lung, and even neoplastic cells, which may in turn influence disease prognosis and drug pharmacokinetics."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "8", "end_ref": "14"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nHigh‐resolution structural investigations—including crystallography, molecular dynamics simulations, and molecular docking—have shed light on the mechanistic basis for SULT1A3’s exquisite substrate selectivity. Critical amino acid residues, such as Glu146 and Asp86, are essential for proper substrate binding and for the Mn²⁺‐mediated stimulation of sulfonation. These studies also reveal how SULT1A3 accomplishes exclusive regioselectivity in the sulfonation of compounds like flavonoids, and they identify allosteric modulators (for example, tetrahydrobiopterin) that can fine‑tune enzyme function. Such mechanistic insights are also relevant to the enzyme’s role in modulating dopamine neurotoxicity and in processes linked to tumor progression."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "15", "end_ref": "23"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its catalytic and regulatory roles, SULT1A3 is instrumental in facilitating the detoxification and elimination of both endogenous and xenobiotic compounds. By converting substrates such as acetaminophen, dextrorphan, and several analgesics into more water‑soluble sulfate conjugates, SULT1A3 primes these molecules for excretion—often in concert with efflux transporters like BCRP and MRP4. Altered SULT1A3 expression and activity have been implicated in diverse pathological contexts, including hepatocellular carcinoma and neurodegenerative disorders, highlighting its dual role in cellular protection and disease progression."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "24", "end_ref": "29"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "T Govind Pai, Kei Ohkimoto, Yoichi Sakakibara, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Manganese stimulation and stereospecificity of the Dopa (3,4-dihydroxyphenylalanine)/tyrosine-sulfating activity of human monoamine-form phenol sulfotransferase. Kinetic studies of the mechanism using wild-type and mutant enzymes."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2002)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M200785200"}], "href": "https://doi.org/10.1074/jbc.M200785200"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "12228221"}], "href": "https://pubmed.ncbi.nlm.nih.gov/12228221"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "T Govind Pai, Ila Oxendine, Takuya Sugahara, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Structure-function relationships in the stereospecific and manganese-dependent 3,4-dihydroxyphenylalanine/tyrosine-sulfating activity of human monoamine-form phenol sulfotransferase, SULT1A3."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2003)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M203108200"}], "href": "https://doi.org/10.1074/jbc.M203108200"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "12424257"}], "href": "https://pubmed.ncbi.nlm.nih.gov/12424257"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Takuya Sugahara, T Govind Pai, Masahito Suiko, et al. 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