| 2003 |
Crystal structure of human DHEA-ST (SULT2A1) in complex with androsterone (ADT) solved at 2.7 Å, revealing that ADT binds with a different orientation than DHEA despite similar overall complex structure, and demonstrating that SULT2A1 catalyzes androsterone sulfation with similar kinetics but ~2-fold higher specificity and stronger substrate inhibition than DHEA. |
X-ray crystallography (2.7 Å), in vitro enzymatic kinetics with purified recombinant protein |
The Journal of biological chemistry |
High |
14573603
|
| 2007 |
Active-site mutagenesis of SULT2A1 identified Tyr-238 and Met-137 as the two amino acids critical for substrate inhibition: Tyr-238 regulates release of bound substrate (Y238A mutation abolishes substrate inhibition for ADT and increases Ki for DHEA), while Met-137 controls substrate binding orientation of both DHEA and ADT. Crystal structures of Met-137 mutants confirmed these binding orientation changes. |
Site-directed mutagenesis, in vitro enzymatic assays, X-ray crystallography of mutant proteins |
Molecular pharmacology |
High |
18042734
|
| 2014 |
Complete quantitative kinetic mechanism of SULT2A1 determined: the mechanism comprises eight enzyme forms interconverting via 22 rate constants, each determined independently, providing a full description of sulfuryl transfer from PAPS to acceptor hydroxyls/amines. |
Comprehensive kinetic analysis with independently determined rate constants; in vitro enzymatic assays |
The Journal of biological chemistry |
High |
25056952
|
| 2010 |
SULT2A1 functions as a homodimer; a monomeric MBP-SULT2A1 fusion protein retains similar Km and Vmax for DHEA but lacks substrate inhibition. Intrinsic fluorescence showed two DHEA molecules bind each subunit (one catalytic, one allosteric); dimerization increases DHEA binding at the allosteric site, which is responsible for substrate inhibition. |
Size exclusion chromatography, intrinsic fluorescence binding assays, initial-rate kinetics with purified recombinant protein |
Hormone molecular biology and clinical investigation |
High |
21822453 25961208
|
| 2010 |
Substrate inhibition of SULT2A1 by DHEA is mechanistically explained by formation of non-productive ternary dead-end complexes involving the nucleotide product PAP; equilibrium binding and initial velocity studies showed negative cooperativity in DHEA binding, consistent with involvement of both DHEA and DHEA-sulfate in these complexes. |
Initial velocity studies, equilibrium binding assays, in vitro enzymatic assays with purified recombinant hSULT2A1 |
Archives of biochemistry and biophysics |
Medium |
21187059
|
| 2018 |
SULT2A1 physically interacts with PAPS synthase 2 (PAPSS2) but only weakly with PAPSS1, as demonstrated by proximity ligation assay; molecular docking identified a putative binding site for SULT2A1 within the PAPSS2 APS kinase domain. Knockdown experiments confirmed PAPSS2, but not PAPSS1, is required for efficient DHEA sulfation in adrenocortical NCI-H295R1 cells, establishing a direct protein–protein interaction underlying selective PAPS channeling to SULT2A1. |
Proximity ligation assay, siRNA knockdown in NCI-H295R1 cells, molecular docking |
The Journal of biological chemistry |
Medium |
29743239
|
| 2002 |
Three non-synonymous coding SNPs in SULT2A1 (found in African-American subjects) significantly decrease enzyme activity; decreased immunoreactive protein levels are the major mechanism, though apparent Km values also vary. One variant disrupts the dimerization interface causing the allozyme to behave as a monomer by gel filtration. |
Heterologous expression in COS-1 cells, Western blot, gel filtration chromatography, enzyme activity assays |
The pharmacogenomics journal |
Medium |
11990382
|
| 2010 |
SULT2A1 sulfates 15 human bile acids with Michaelis–Menten kinetics; sulfation affinity (Km) is inversely proportional to the number of hydroxyl groups—lithocholic acid (monohydroxy) shows highest affinity and cholic acid (trihydroxy) the lowest. DHEA sulfation Km = 3.8 µM, Vmax = 130.8 pmol/min/mg in stably transfected HEK293 cells. |
Stable HEK293 cell expression system, kinetic enzymatic assays |
Xenobiotica |
Medium |
20102295
|
| 2009 |
SULT2A1 is the sole human cytosolic sulfotransferase responsible for N-sulfoconjugation of quinolone drugs (ciprofloxacin, moxifloxacin, garenoxacin) and other amine-containing drugs (desipramine, metoclopramide); the other five SULT isoforms tested showed no activity. Human liver cytosol N-sulfation kinetics were monophasic with Km values matching those of recombinant SULT2A1. |
In vitro enzymatic assays with purified recombinant SULTs and human liver cytosols, kinetic analysis |
Drug metabolism and disposition |
Medium |
19420132
|
| 2005 |
Vitamin D receptor (VDR) induces SULT2A1 transcription through a composite element containing an imperfect inverted-repeat VDRE and a C/EBP-alpha binding site 9 bp downstream. C/EBP-alpha is essential for this induction: mutations abolish induction, C/EBP-alpha-deficient cells require cotransfected C/EBP-alpha, and C/EBP-beta cannot substitute. VDR and C/EBP-alpha form a DNA-dependent, coimmunoprecipitable complex at the element, with concurrent recruitment of coactivators p300, SRC-1, and SRC-2 (but not SRC-3). |
Reporter gene assays, EMSA, DNase I footprinting, antibody supershift, chromatin immunoprecipitation (ChIP), co-immunoprecipitation, site-directed mutagenesis |
Molecular endocrinology |
High |
16357103
|
| 2007 |
HNF4α plays a central role in SULT2A1 transcription: two HNF4α-binding sites in the SULT2A1 5'-flanking region (-6160 and -54) were identified by in vitro binding and site-directed mutagenesis; HNF4α binds the endogenous gene (confirmed by ChIP). Rifampicin-activated PXR suppresses SULT2A1 by interfering with HNF4α activity; PXR knockdown by RNAi diminished this suppression. |
Transient transfection reporter assays, in vitro binding, site-directed mutagenesis, ChIP, siRNA knockdown in HepG2 cells, primary human hepatocytes |
The Journal of pharmacology and experimental therapeutics |
High |
17687072
|
| 2005 |
Estrogen-related receptor alpha (ERRα) activates SULT2A1 transcription in adrenal cells: three functional ERRα-binding cis-elements (sharing SF1 similarity) were identified in the SULT2A1 5'-flanking region by serial deletion and EMSA; ERRα stimulated SULT2A1 promoter activity more strongly than SF1. |
Reporter gene assays, EMSA, serial deletion analysis, cotransfection experiments |
Endocrinology |
Medium |
15878968
|
| 2012 |
RORα and RORγ transactivate SULT2A1 gene expression through a ROR response element in the SULT2A1 promoter (overlapping with a previously identified CAR response element), as demonstrated by reporter assays, EMSA, and ChIP; siRNA knockdown of RORα/RORγ reduced endogenous SULT2A1 expression in human hepatocytes. |
Promoter reporter assays, EMSA, ChIP, siRNA knockdown in primary human hepatocytes |
Molecular endocrinology |
Medium |
23211525
|
| 2014 |
LXRα (NR1H3) transactivates SULT2A1 via specific binding to the -500 to -258 bp region of the SULT2A1 promoter; LXRα siRNA knockdown showed LXRα, but not LXRβ, dominantly regulates SULT2A1 expression at mRNA, protein, and enzymatic levels. |
Promoter reporter assays, ChIP, siRNA knockdown, enzyme activity assays in HepG2 cells and primary human hepatocytes |
Drug metabolism and disposition |
Medium |
25028566
|
| 2011 |
ERRα represses SULT2A1 promoter transcription in HepG2 cells through two ERRα response elements (ERRE188 and ERRE155) in the -188 to -130 bp region that overlap with IR2 and DR4 nuclear receptor elements; ERRα competes with other nuclear receptors for binding to these elements, confirmed by EMSA and ChIP. |
Reporter gene assays with deletion analysis, EMSA, ChIP in HepG2 cells |
Chemico-biological interactions |
Medium |
21513704
|
| 2019 |
hsa-miR-495-3p and hsa-miR-486-5p post-transcriptionally suppress SULT2A1 expression by binding directly to miRNA response elements in the SULT2A1 3'-UTR and decreasing mRNA stability; this was demonstrated by RNA EMSA, luciferase reporter assays, and gain/loss-of-function experiments in HepG2 cells. |
Fluorescence-based RNA EMSA, luciferase reporter assays, miRNA overexpression/inhibition in HepG2 cells |
Biochemical pharmacology |
Medium |
31445882
|
| 2006 |
Hydroxylated PCB metabolites (OHPCBs) act as both substrates and inhibitors of purified recombinant SULT2A1: 4-OH PCB 34 and 4'-OH PCB 68 are substrates (with 4-OH PCB 34 showing substrate inhibition similar to DHEA), while 4'-OH PCB 9 is an inhibitor but not a substrate. |
In vitro enzymatic assays with purified recombinant SULT2A1 |
Chemical research in toxicology |
Medium |
17112228
|
| 2004 |
During the LPS-induced acute-phase response in mice, hepatic Sult2A1 mRNA and enzyme activity are suppressed in a time- and dose-dependent manner, accompanied by decreased serum DHEA-S; TNF and IL-1 mediate this suppression in human Hep3B cells, suggesting that inflammatory cytokine-driven suppression of FXR/PXR/CAR leads to decreased SULT2A1-mediated DHEA sulfation. |
LPS treatment in mice, RT-PCR, enzyme activity assay, serum steroid measurement, cytokine treatment of Hep3B cells |
American journal of physiology. Endocrinology and metabolism |
Medium |
15198932
|
| 2010 |
Glycyrrhetinic acid (the active component of liquorice) directly inhibits adrenal SULT2A1 activity with an IC50 of ~7 µM, decreasing sulfoconjugation of DHEA and deoxycorticosterone in adrenocortical H295 cells without altering SULT2A1 mRNA levels, increasing free DHEA and deoxycorticosterone. |
Adrenocortical H295 cell incubations, radiolabeled steroid conjugation assays, mRNA analysis |
Molecular and cellular endocrinology |
Medium |
21184804
|
| 2021 |
Metformin suppresses CAR-induced (but not basal) SULT2A1 expression by blocking CAR nuclear translocation via an AMPK-dependent mechanism in HepaRG cells. |
Western blot, cell viability assay, nuclear fractionation, HepaRG cell model with pharmacological activators/inhibitors |
International journal of endocrinology |
Low |
33643408
|
| 2014 |
Dopamine D1 receptor (DRD1) activation in HepG2 cells upregulates SULT2A1 mRNA, protein, and enzyme activity via elevated cAMP; this effect is partially blocked by DRD1 antagonist SCH23390 and reduced by DRD1-specific siRNA knockdown. |
RT-PCR, Western blot, HPLC enzyme activity assay, cAMP measurement, siRNA knockdown in HepG2 cells |
Acta pharmacologica Sinica |
Low |
24909515
|
| 2004 |
Alpha-hydroxytamoxifen (alpha-OHTAM) stereoisomers are all substrates for human SULT2A1 (unlike rat STa where only one enantiomer is a substrate); Z-enantiomers show higher kcat/Km values with SULT2A1 than E-enantiomers, demonstrating stereospecificity in SULT2A1-catalyzed sulfation. |
In vitro enzymatic assays with highly purified recombinant SULT2A1, kinetic analysis of stereoisomers |
Drug metabolism and disposition |
Medium |
15371299
|