GO:0050427 3'-phosphoadenosine 5'-phosphosulfate metabolic process: Sulfation Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0050427 describes the chemical reactions and pathways involving 3'-phosphoadenosine 5'-phosphosulfate (PAPS), a universal sulfate donor for sulfotransferases.
• PAPS is synthesized from ATP and inorganic sulfate by PAPS synthase (PAPSS1/PAPSS2) and is consumed by sulfotransferases to sulfonate substrates.
• PAPS levels are tightly regulated because sulfation modulates the activity of hormones, neurotransmitters, drugs, and xenobiotics.
• Dysregulation of PAPS metabolism is linked to liver toxicity, cancer, and developmental disorders.
• PAPS allosterically regulates sulfotransferase turnover, providing a feedback mechanism to maintain sulfation homeostasis.
• CRISPR-based models (knockout, point mutation, knock-in, overexpression) enable causal interrogation of PAPS metabolic genes in human disease.
Description
3'-phosphoadenosine 5'-phosphosulfate (PAPS) is a high-energy sulfate donor that serves as the obligate co-substrate for all sulfotransferase reactions in eukaryotes and prokaryotes. The metabolic process that produces, utilizes, and recycles PAPS is annotated as GO:0050427, and it is central to the sulfation of carbohydrates, proteins, lipids, and xenobiotics. Because sulfation alters the biological activity, solubility, and half-life of countless molecules, PAPS metabolism is a key node in drug metabolism, hormone regulation, and cellular detoxification. Research into PAPS metabolism spans biochemistry, genetics, and pharmacology. The pathway is essential for the sulfation of cholecystokinin in the brain, the modification of plant peptide hormones, and the detoxification of drugs in the liver. Defects in PAPS synthesis cause genetic deficiencies in humans, and inhibition of PAPS-dependent sulfation can prevent oxidative hepatotoxicity. Understanding the enzymes and regulatory loops that control PAPS levels is therefore critical for developing therapies that target sulfation pathways. This article integrates authoritative QuickGO annotation data with verified PubMed literature to provide a research-grade overview of GO:0050427. It covers the definition, molecular mechanism, key genes, disease associations, and state-of-the-art methods including CRISPR genome editing for functional studies.
3'-phosphoadenosine 5'-phosphosulfate metabolic process At A Glance
| GO ID | GO:0050427 |
|---|---|
| GO term | 3'-phosphoadenosine 5'-phosphosulfate metabolic process |
| Ontology | biological_process |
| Synonym | PAPS metabolic process; PAPS metabolism; 3'-phosphoadenylyl-sulfate metabolic process; adenosine 3'-phosphate 5'-phosphosulfate metabolic process; phosphoadenosine phosphosulfate metabolic process |
| Major function | Synthesis, utilization, and turnover of PAPS, the universal sulfate donor for sulfotransferase reactions |
| Key enzymes | PAPS synthase (PAPSS1, PAPSS2), sulfotransferases (SULT family), 3'(2'),5'-bisphosphate nucleotidase (BPNT1) |
| Substrates | ATP, inorganic sulfate, acceptor molecules (hormones, neurotransmitters, drugs, xenobiotics) |
| Products | Sulfated acceptor molecules, PAP, and downstream sulfate conjugates |
| Pathway relevance | Drug metabolism, hormone regulation, detoxification, brain signaling, plant hormone sulfation |
What Is GO:0050427?
GO:0050427, 3'-phosphoadenosine 5'-phosphosulfate metabolic process, is defined by QuickGO as the chemical reactions and pathways involving 3'-phosphoadenosine 5'-phosphosulfate, a naturally occurring mixed anhydride that serves as an intermediate in the formation of a variety of sulfo compounds in biological systems. In practice, this process encompasses the biosynthesis of PAPS from ATP and sulfate, its transport, its utilization by sulfotransferases to transfer sulfate to acceptor molecules, and the degradation or recycling of the resulting adenosine 3',5'-bisphosphate (PAP).
Why Is 3'-phosphoadenosine 5'-phosphosulfate metabolic process Important in Cell Biology?
PAPS metabolism is essential because it supplies the sulfate group for all sulfotransferase-mediated reactions, which regulate the activity of hormones, neurotransmitters, and drugs, and facilitate the detoxification of xenobiotics. Perturbations in PAPS synthesis or utilization are associated with human genetic deficiencies, liver injury, and cancer, making this pathway a target for therapeutic intervention and a critical consideration in drug development.
• PAPS is the obligate sulfate donor for all sulfotransferase reactions, controlling the bioactivity of hormones and neurotransmitters.
• Sulfation is a major phase II detoxification pathway for drugs and xenobiotics, and PAPS availability determines detoxification capacity.
• Genetic deficiency in PAPS synthase causes skeletal and endocrine abnormalities in humans.
• Inhibition of p53 sulfoconjugation via PAPS metabolism prevents oxidative hepatotoxicity and acute liver failure.
• PAPS allosterically regulates sulfotransferase turnover, linking donor supply to enzyme stability.
• Sulfated plant peptide hormones require PAPS for growth and development, highlighting evolutionary conservation.
• PAPS metabolism in the brain supports sulfation of cholecystokinin by tyrosylprotein sulfotransferase.
• 3'(2'),5'-bisphosphate nucleotidase (BPNT1) degrades PAP, preventing inhibition of sulfotransferases and maintaining pathway flux.
• Dysregulated PAPS metabolism is implicated in cancer, neurodegeneration, and metabolic disorders.
• CRISPR screens targeting PAPS pathway genes can identify novel regulators of drug metabolism and disease.
What Happens During 3'-phosphoadenosine 5'-phosphosulfate metabolic process?
PAPS Biosynthesis
In simple terms: The cell builds PAPS, the sulfate donor, from ATP and sulfate.
PAPS is synthesized in two sequential reactions catalyzed by PAPS synthase (PAPSS1 and PAPSS2 in humans). First, ATP sulfurylase converts ATP and inorganic sulfate to adenosine 5'-phosphosulfate (APS) and pyrophosphate. Second, APS kinase phosphorylates APS at the 3'-position to form PAPS, consuming a second molecule of ATP. This dual activity resides in a single bifunctional enzyme in mammals, and its deficiency leads to impaired sulfation.
Sulfate Transfer by Sulfotransferases
In simple terms: Sulfotransferases take the sulfate from PAPS and attach it to target molecules.
Cytosolic and membrane-bound sulfotransferases (SULT family) catalyze the transfer of the sulfonate group from PAPS to hydroxyl or amino groups on acceptor substrates, producing a sulfated product and adenosine 3',5'-bisphosphate (PAP). This reaction is essential for the sulfation of steroids, catecholamines, thyroid hormones, and xenobiotics, thereby modulating their activity and excretion.
PAP Degradation and Recycling
In simple terms: The leftover PAP is broken down so the pathway can continue.
The byproduct PAP is a potent inhibitor of sulfotransferases and must be removed. 3'(2'),5'-bisphosphate nucleotidase (BPNT1) hydrolyzes PAP to adenosine 5'-monophosphate (AMP) and inorganic phosphate, relieving inhibition and allowing sulfation to proceed. This step is critical for maintaining flux through the PAPS metabolic process.
Allosteric Regulation by PAPS
In simple terms: PAPS itself can control how long sulfotransferases last in the cell.
Beyond its role as a donor, PAPS acts as an allosteric regulator of sulfotransferase turnover. Binding of PAPS to sulfotransferases can stabilize or destabilize the enzymes, providing a feedback mechanism that matches enzyme abundance to donor availability. This regulation ensures that sulfation capacity is tuned to cellular needs.
Tissue-Specific and Developmental Roles
In simple terms: Different tissues use PAPS for specialized functions.
In the brain, PAPS is required for the sulfation of cholecystokinin by tyrosylprotein sulfotransferase, which affects neuropeptide activity. In plants, PAPS-dependent sulfation of peptide hormones regulates growth and development. These examples illustrate the broad biological importance of PAPS metabolism across kingdoms.
Key Genes Involved in GO:0050427 3'-phosphoadenosine 5'-phosphosulfate metabolic process
The following genes encode enzymes and regulators that directly participate in or control the 3'-phosphoadenosine 5'-phosphosulfate metabolic process.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PAPSS1 | Bifunctional ATP sulfurylase/APS kinase; synthesizes PAPS | Target for modulating PAPS supply in cancer and drug metabolism |
| PAPSS2 | Bifunctional ATP sulfurylase/APS kinase; synthesizes PAPS | Mutations cause skeletal dysplasia and androgen excess |
| SULT1A1 | Cytosolic sulfotransferase; sulfates phenols and drugs | Drug metabolism and carcinogen activation |
| SULT1E1 | Estrogen sulfotransferase; sulfates estrogens | Hormone-dependent cancers and endocrine regulation |
| SULT2A1 | Dehydroepiandrosterone sulfotransferase | Steroid hormone regulation and liver function |
| SULT4A1 | Brain-specific sulfotransferase | Neurotransmitter sulfation and brain function |
| BPNT1 | 3'(2'),5'-bisphosphate nucleotidase; degrades PAP | Prevents sulfotransferase inhibition; maintains pathway flux |
| TPST1 | Tyrosylprotein sulfotransferase 1 | Protein sulfation in secretory pathway |
| TPST2 | Tyrosylprotein sulfotransferase 2 | Protein sulfation and viral entry |
| CHST1 | Carbohydrate sulfotransferase 1 | Keratan sulfate biosynthesis |
| CHST3 | Carbohydrate sulfotransferase 3 | Chondroitin sulfate biosynthesis |
| GAL3ST1 | Galactose-3-O-sulfotransferase 1 | Sulfatide biosynthesis in myelin |
| UST | Uronyl 2-sulfotransferase | Glycosaminoglycan sulfation |
| HS6ST1 | Heparan sulfate 6-O-sulfotransferase 1 | Heparan sulfate modification and signaling |
| NDST1 | N-deacetylase/N-sulfotransferase 1 | Heparan sulfate biosynthesis |
| PAPSS1/2 | PAPS synthase complex | Coordinate regulation of PAPS supply |
| SULT1B1 | Thyroid hormone sulfotransferase | Thyroid hormone metabolism |
| SULT1C2 | Sulfotransferase family 1C member 2 | Xenobiotic metabolism |
How Is 3'-phosphoadenosine 5'-phosphosulfate metabolic process Regulated?
PAPS metabolism is regulated at multiple levels. The expression of PAPS synthase (PAPSS1 and PAPSS2) is controlled by developmental and hormonal signals, and its activity can be modulated by feedback inhibition from PAP. PAPS levels allosterically regulate sulfotransferase stability, creating a feedback loop that adjusts enzyme turnover to donor availability. Additionally, BPNT1 activity determines the rate of PAP degradation, which in turn influences sulfotransferase activity. In the liver, p53 sulfoconjugation via PAPS-dependent sulfation is a regulatory node that affects oxidative stress responses. Together, these mechanisms maintain PAPS homeostasis and ensure appropriate sulfation capacity.
3'-phosphoadenosine 5'-phosphosulfate metabolic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PAPSS2 | Skeletal dysplasia, androgen excess | Knockout mouse, patient iPSC-derived chondrocytes |
| TP53 | Acute liver failure, oxidative hepatotoxicity | Liver-specific knockout, point mutation (sulfation site) |
| SULT1E1 | Breast and endometrial cancer | Knockout and overexpression in cancer cell lines |
| SULT2A1 | Adrenal and liver tumors | Knockout in hepatocyte models |
| BPNT1 | Sulfation imbalance, developmental defects | Knockout zebrafish and mouse models |
PAPS Synthase Deficiency and Skeletal Dysplasia
Biallelic mutations in PAPSS2 cause a rare autosomal recessive disorder characterized by skeletal dysplasia, androgen excess, and premature pubarche. The deficiency impairs PAPS synthesis, leading to reduced sulfation of steroids and glycosaminoglycans, which affects bone development and endocrine function.
p53 Sulfoconjugation and Acute Liver Failure
Inhibition of p53 sulfoconjugation, a process dependent on PAPS, prevents oxidative hepatotoxicity and acute liver failure. This suggests that PAPS metabolism is a critical determinant of p53 activity and liver injury, and that targeting this pathway could be therapeutic.
Cancer and Hormone-Dependent Tumors
Sulfotransferases that consume PAPS regulate the activity of estrogens and androgens. Altered expression of SULT1E1 and SULT2A1 has been observed in hormone-dependent cancers, and PAPS availability can influence tumor growth and drug resistance.
Neurodegeneration and Brain Sulfation
PAPS is required for the sulfation of cholecystokinin and other neuropeptides in the brain. Dysregulation of PAPS metabolism may contribute to neurodegenerative conditions by altering neuropeptide signaling.
From 3'-phosphoadenosine 5'-phosphosulfate metabolic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of PAPSS1 reduce PAPS levels and sulfation? | PAPSS1 knockout cell lines (HepG2, HEK293) |
| Does a point mutation in the PAPS binding site of SULT1E1 alter substrate specificity? | Point-mutation knock-in via CRISPR |
| Can overexpression of PAPSS2 rescue sulfation defects? | Overexpression cell models |
| What is the role of BPNT1 in PAP turnover? | BPNT1 knockout and tagged knock-in for localization |
| Does p53 sulfation site mutation affect liver injury? | Knock-in mice with p53 sulfation-site mutation |
| Which genes regulate PAPS metabolism in a genome-wide screen? | CRISPR library screening in hepatocytes |
How to Study the 3'-phosphoadenosine 5'-phosphosulfate metabolic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| LC-MS/MS | PAPS and PAP concentrations | Quantifying pathway flux in cells and tissues |
| CRISPR knockout screening | Gene essentiality and modifiers | Identifying regulators of PAPS metabolism |
| RNA-seq | Transcript levels of PAPS pathway genes | Expression profiling across disease models |
| Proteomics | Protein abundance of PAPSS, SULTs, BPNT1 | Validating expression changes |
| Sulfotransferase activity assay | Enzyme kinetics with PAPS | Functional characterization of variants |
| Metabolomics | Sulfated metabolites | Drug metabolism and biomarker discovery |
| Immunofluorescence | Subcellular localization of PAPS enzymes | Studying compartmentalization |
| CRISPR point mutation | Specific amino acid function | Dissecting catalytic and regulatory residues |
Biochemical Assays for PAPS Synthesis and Utilization
PAPS levels can be measured using HPLC or LC-MS/MS after extraction from cells or tissues. PAPS synthase activity is assayed by monitoring the conversion of ATP and sulfate to PAPS using radiolabeled sulfate or by coupling to sulfotransferase reactions.
Genetic and CRISPR Screens
CRISPR knockout and activation screens can identify genes that regulate PAPS metabolism and sulfation. For example, a genome-wide screen in hepatocytes can reveal modifiers of p53 sulfoconjugation and oxidative stress.
Transcriptomics and Proteomics
RNA-seq and proteomics can quantify expression of PAPSS1, PAPSS2, SULT family members, and BPNT1 across tissues and conditions. These methods help link PAPS metabolic gene expression to disease states.
Metabolomics and Sulfation Profiling
Untargeted and targeted metabolomics can measure sulfated metabolites (e.g., sulfated steroids, sulfated drugs) to infer PAPS metabolic flux. This approach is useful in drug metabolism studies and in characterizing genetic models.
How CRISPR Can Be Used to Study GO:0050427 3'-phosphoadenosine 5'-phosphosulfate metabolic process
Knockout
CRISPR knockout of PAPSS1, PAPSS2, or BPNT1 in cell lines (e.g., HepG2, HEK293) abolishes or reduces PAPS synthesis and sulfation capacity. These models are used to study the consequences of PAPS depletion on drug metabolism, hormone signaling, and cell survival.
Point Mutation
Point mutations can be introduced into the catalytic domains of PAPSS or sulfotransferases to dissect substrate binding and catalysis. For example, mutating the PAPS-binding site of SULT1E1 can reveal residues critical for sulfate transfer.
Knock-in
Knock-in of tagged versions of PAPSS1, PAPSS2, or BPNT1 (e.g., FLAG, GFP) allows for localization and interaction studies. Knock-in of disease-associated mutations (e.g., PAPSS2 variants) creates isogenic models for functional analysis.
Overexpression
Overexpression of PAPSS1 or PAPSS2 via CRISPR activation or lentiviral delivery increases PAPS levels and sulfation capacity. This is useful for rescue experiments and for studying the effects of enhanced sulfation on drug detoxification and hormone regulation.
How EDITGENE Supports 3'-phosphoadenosine 5'-phosphosulfate metabolic process Research
Researchers studying 3'-phosphoadenosine 5'-phosphosulfate metabolic process-related genes often need to determine whether a candidate gene is causally involved in sulfation, disease, or drug metabolism. EDITGENE provides a comprehensive suite of CRISPR services to generate precisely engineered cell models for such functional studies.
Contact EDITGENE today to design your custom CRISPR model for 3'-phosphoadenosine 5'-phosphosulfate metabolic process research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| ENPP1 Knockout HEK293 Cell Line | EDJ-KQ5436 | Human | 5167 | Details Get a Quote |
| TPST2 Knockout HEK293 Cell Line | EDJ-KQ5546 | Human | 8459 | Details Get a Quote |
| SULT1E1 Knockout HEK293 Cell Line | EDJ-KQ5855 | Human | 6783 | Details Get a Quote |
| SULT1A2 Knockout HEK293 Cell Line | EDJ-KQ5859 | Human | 6799 | Details Get a Quote |
| SULT1A1 Knockout HEK293 Cell Line | EDJ-KQ5864 | Human | 6817 | Details Get a Quote |
| SULT2A1 Knockout HEK293 Cell Line | EDJ-KQ5865 | Human | 6822 | Details Get a Quote |
| BPNT1 Knockout HEK293 Cell Line | EDJ-KQ7026 | Human | 10380 | Details Get a Quote |
| SULT1B1 Knockout HEK293 Cell Line | EDJ-KQ8742 | Human | 27284 | Details Get a Quote |
| ABHD14B Knockout HEK293 Cell Line | EDJ-KQ9445 | Human | 84836 | Details Get a Quote |
| SULT2B1 Knockout HEK293 Cell Line | EDJ-KQ12189 | Human | 6820 | Details Get a Quote |
| SULT1C3 Knockout HEK293 Cell Line | EDJ-KQ15563 | Human | 442038 | Details Get a Quote |
| TPST1 Knockout HEK293 Cell Line | EDJ-KQ15901 | Human | 8460 | Details Get a Quote |
| TPST1 Knockout A-549 Cell Line | EDJ-KQ18071 | Human | 8460 | Details Get a Quote |
| TPST2 Knockout A-549 Cell Line | EDJ-KQ30109 | Human | 8459 | Details Get a Quote |
| TPST2 Knockout HCT 116 Cell Line | EDJ-KQ30111 | Human | 8459 | Details Get a Quote |
Displaying Records 1 To 15 Of 57 Records
- 1
- 2
- Next Page »
Frequently Asked Questions About 3'-phosphoadenosine 5'-phosphosulfate metabolic process
What is 3'-phosphoadenosine 5'-phosphosulfate metabolic process?
It is the biological process (GO:0050427) that produces, uses, and recycles PAPS, the universal sulfate donor for sulfotransferase reactions.
What genes are involved in PAPS metabolism?
Key genes include PAPSS1, PAPSS2, BPNT1, and the SULT family of sulfotransferases.
What is the function of PAPS?
PAPS serves as the sulfate donor for sulfation of hormones, neurotransmitters, drugs, and xenobiotics, modulating their activity and excretion.
How is PAPS synthesized?
PAPS is synthesized from ATP and inorganic sulfate by the bifunctional enzyme PAPS synthase (PAPSS1/PAPSS2) in two steps.
What diseases are associated with PAPS metabolism?
PAPSS2 deficiency causes skeletal dysplasia and androgen excess; altered PAPS metabolism is linked to liver failure and cancer.
What is the role of BPNT1 in PAPS metabolism?
BPNT1 degrades PAP, the inhibitory byproduct of sulfation, to maintain sulfotransferase activity.
How can CRISPR be used to study PAPS metabolism?
CRISPR knockout, point mutation, knock-in, and overexpression models allow causal testing of PAPS pathway genes in disease and drug metabolism.
Is PAPS metabolism conserved in plants?
Yes, PAPS-dependent sulfation of peptide hormones regulates plant growth and development.
What methods measure PAPS levels?
LC-MS/MS, HPLC, and coupled enzyme assays are commonly used to quantify PAPS and PAP in biological samples.
Why is PAPS important for drug metabolism?
Many drugs are sulfated by sulfotransferases using PAPS, which affects their solubility, activity, and clearance.
Conclusion
GO:0050427, 3'-phosphoadenosine 5'-phosphosulfate metabolic process, is a fundamental pathway that supplies the sulfate donor for countless biological reactions. Its dysregulation is implicated in genetic disorders, liver injury, and cancer, making it a compelling target for therapeutic development. CRISPR-based models offer powerful tools to dissect the causal roles of PAPS metabolic genes, and EDITGENE provides end-to-end services to generate such models efficiently.
References
- 1. Ramaswamy SG et al.. 1987. (2')3',5'-Bisphosphate nucleotidase.. J Biol Chem 262(21):10044-7 PMID: 3038862
- 2. Venkatachalam KV. 2003. Human 3'-phosphoadenosine 5'-phosphosulfate (PAPS) synthase: biochemistry, molecular biology and genetic deficiency.. IUBMB Life 55(1):1-11 PMID: 12716056
- 4. Xu P et al.. 2022. Inhibition of p53 Sulfoconjugation Prevents Oxidative Hepatotoxicity and Acute Liver Failure.. Gastroenterology 162(4):1226-1241 PMID: 34954226
- 5. Vargas F et al.. 1994. 3'-Phosphoadenosine 5'-phosphosulfate biosynthesis and the sulfation of cholecystokinin by the tyrosylprotein-sulfotransferase in rat brain tissue.. Chem Biol Interact 92(1-3):281-91 PMID: 8033261
- 6. Kaufmann C et al.. 2019. Sulfated plant peptide hormones.. J Exp Bot 70(16):4267-4277 PMID: 31231771
- 7. Klaassen CD et al.. 1997. Sulfation and sulfotransferases 5: the importance of 3'-phosphoadenosine 5'-phosphosulfate (PAPS) in the regulation of sulfation.. FASEB J 11(6):404-18 PMID: 9194521
- 8. Wang T et al.. 2014. 3'-Phosphoadenosine 5'-phosphosulfate allosterically regulates sulfotransferase turnover.. Biochemistry 53(44):6893-900 PMID: 25314023
