GO:0001537 dermatan 4-sulfotransferase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0001537 dermatan 4-sulfotransferase activity catalyzes the transfer of sulfate from 3'-phosphoadenylyl sulfate (PAPS) to the 4-O position of N-acetylgalactosamine residues in dermatan, producing dermatan 4'-sulfate and adenosine 3',5'-bisphosphate.
• The enzyme D4ST1 (encoded by CHST14) is pivotal for the formation of iduronic acid blocks in dermatan sulfate, a critical modification that influences growth factor binding and tissue homeostasis.
• D4ST1 forms functional complexes with dermatan sulfate epimerase 1 (DS-epi1), enabling the generation of long epimerized 4-O-sulfated blocks that are essential for dermatan sulfate function.
• Loss-of-function mutations in CHST14 cause musculocontractural Ehlers-Danlos syndrome (mcEDS), a congenital disorder of glycosylation characterized by connective tissue fragility and multiple congenital anomalies [2,3].
• Dermatan 4-sulfotransferase activity is a key molecular function in glycosaminoglycan biosynthesis, and its dysregulation has been linked to developmental defects and cancer progression.
• CRISPR-based knockout, point mutation, and knock-in models of CHST14 and related genes provide powerful tools to dissect the biological roles of dermatan 4-sulfotransferase activity in health and disease [2,3].
Description
Dermatan 4-sulfotransferase activity (GO:0001537) is a molecular function that catalyzes the transfer of a sulfate group from 3'-phosphoadenylyl sulfate (PAPS) to the 4-O position of N-acetylgalactosamine (GalNAc) residues within dermatan, yielding dermatan 4'-sulfate and adenosine 3',5'-bisphosphate. This enzymatic activity is essential for the biosynthesis of dermatan sulfate, a glycosaminoglycan that plays critical roles in extracellular matrix organization, cell signaling, and tissue development. The enzyme responsible for this activity, dermatan 4-O-sulfotransferase 1 (D4ST1), is encoded by the CHST14 gene and is pivotal for the formation of iduronic acid blocks in dermatan sulfate. Researchers study dermatan 4-sulfotransferase activity because it directly influences the structural and functional properties of dermatan sulfate, which modulates the activity of growth factors and morphogens. Defects in this activity lead to musculocontractural Ehlers-Danlos syndrome (mcEDS), a rare congenital disorder with severe connective tissue and developmental abnormalities [2,3]. Understanding the molecular mechanism, regulation, and disease relevance of GO:0001537 is therefore crucial for developing therapeutic strategies and for basic research in glycobiology. This article provides a comprehensive overview of dermatan 4-sulfotransferase activity, covering its definition, biological importance, key genes, regulatory mechanisms, associated diseases, and state-of-the-art research methods including CRISPR-based models. All facts are based on published literature and the QuickGO definition.
dermatan 4-sulfotransferase activity At A Glance
| GO ID | GO:0001537 |
|---|---|
| GO term | dermatan 4-sulfotransferase activity |
| Ontology | molecular_function |
| Synonym | N-acetylgalactosamine 4-O-sulfotransferase activity, N-acetylgalactosamine 4-O-sulphotransferase activity |
| Major function | Catalyzes the transfer of sulfate from PAPS to the 4-O position of GalNAc in dermatan, forming dermatan 4'-sulfate |
| Substrate | Dermatan (and PAPS as sulfate donor) |
| Product | Dermatan 4'-sulfate, adenosine 3',5'-bisphosphate, H+ |
| Cofactor | 3'-Phosphoadenylyl sulfate (PAPS) |
| Cellular location | Golgi apparatus (trans-Golgi network) |
| Related enzyme | Dermatan 4-O-sulfotransferase 1 (D4ST1), encoded by CHST14 |
What Is GO:0001537?
Dermatan 4-sulfotransferase activity (GO:0001537) is defined as the catalysis of the reaction: n 3'-phosphoadenylyl sulfate + dermatan = n adenosine 3',5'-bisphosphate + dermatan 4'-sulfate + n H+. In simpler terms, it is the enzyme activity that adds sulfate groups to the 4-O position of N-acetylgalactosamine residues in dermatan, using PAPS as the sulfate donor. This modification is a key step in the biosynthesis of dermatan sulfate, a glycosaminoglycan found in the extracellular matrix and on cell surfaces.
Why Is dermatan 4-sulfotransferase activity Important in Cell Biology?
Dermatan 4-sulfotransferase activity is critical for the biosynthesis of dermatan sulfate, a glycosaminoglycan that regulates extracellular matrix assembly, growth factor signaling, and tissue morphogenesis. The enzyme D4ST1, which carries this activity, is essential for the formation of iduronic acid blocks that confer unique functional properties to dermatan sulfate. Mutations in CHST14, the gene encoding D4ST1, cause musculocontractural Ehlers-Danlos syndrome, a severe connective tissue disorder [2,3]. Thus, understanding GO:0001537 is vital for both basic glycobiology and clinical research.
• Dermatan 4-sulfotransferase activity is required for the formation of iduronic acid blocks in dermatan sulfate, which are essential for its biological functions.
• It influences the binding of growth factors and cytokines to the extracellular matrix, thereby modulating cell signaling.
• Loss of D4ST1 activity leads to musculocontractural Ehlers-Danlos syndrome, a congenital disorder with severe connective tissue and developmental defects [2,3].
• The activity is involved in the biosynthesis of dermatan sulfate, a molecule implicated in cancer progression and metastasis.
• D4ST1 forms complexes with dermatan sulfate epimerase 1, coordinating epimerization and sulfation for efficient dermatan sulfate synthesis.
• Studying this activity helps elucidate the molecular basis of glycosaminoglycan-related diseases and informs therapeutic development.
• Dermatan 4-sulfotransferase activity is a potential target for modulating extracellular matrix remodeling in fibrosis and wound healing.
• Research on GO:0001537 contributes to understanding the broader family of carbohydrate sulfotransferases and their substrate specificities [5,6].
• The activity is conserved across species, and its study in model organisms provides insights into human development and disease.
• CRISPR-based models of CHST14 and related genes enable precise dissection of dermatan 4-sulfotransferase function in vivo [2,3].
What Happens During dermatan 4-sulfotransferase activity?
Substrate Recognition and Binding
In simple terms: The enzyme grabs the dermatan molecule and the sulfate donor PAPS.
Dermatan 4-sulfotransferase (D4ST1) specifically recognizes dermatan, a glycosaminoglycan composed of repeating disaccharide units of N-acetylgalactosamine (GalNAc) and iduronic acid (IdoA) or glucuronic acid (GlcA). The enzyme binds to the dermatan chain and to the sulfate donor 3'-phosphoadenylyl sulfate (PAPS) in the Golgi lumen. The binding specificity is determined by the enzyme's active site, which accommodates the GalNAc residue and positions it for sulfate transfer.
Catalytic Transfer of Sulfate
In simple terms: The enzyme moves a sulfate group from PAPS onto the dermatan chain.
The catalytic mechanism involves the transfer of a sulfate group from PAPS to the 4-O position of the GalNAc residue in dermatan, resulting in the formation of dermatan 4'-sulfate and adenosine 3',5'-bisphosphate (PAP). This reaction is a typical sulfotransferase reaction, where the enzyme facilitates the nucleophilic attack of the hydroxyl group on the sulfur atom of PAPS. The reaction also releases a proton (H+).
Formation of Iduronic Acid Blocks
In simple terms: The sulfate addition helps create long blocks of iduronic acid in dermatan sulfate.
D4ST1 activity is pivotal for the formation of iduronic acid blocks in dermatan sulfate. These blocks are regions where glucuronic acid residues have been epimerized to iduronic acid by dermatan sulfate epimerase 1 (DS-epi1) and subsequently 4-O-sulfated by D4ST1. The coordinated action of DS-epi1 and D4ST1, which form complexes, generates long epimerized 4-O-sulfated blocks that are essential for the functional properties of dermatan sulfate.
Role in Dermatan Sulfate Biosynthesis
In simple terms: This activity is a key step in making mature dermatan sulfate.
Dermatan 4-sulfotransferase activity is a late step in the biosynthesis of dermatan sulfate, following the initial formation of the chondroitin backbone and epimerization of glucuronic acid to iduronic acid. The 4-O-sulfation of GalNAc residues adjacent to iduronic acid is critical for the interaction of dermatan sulfate with various proteins, including growth factors and cytokines. This modification influences the extracellular matrix and cell signaling processes.
Key Genes Involved in GO:0001537 dermatan 4-sulfotransferase activity
The following genes and proteins are directly involved in dermatan 4-sulfotransferase activity or its regulation.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CHST14 | Encodes dermatan 4-O-sulfotransferase 1 (D4ST1), the enzyme responsible for GO:0001537 activity | Mutations cause musculocontractural Ehlers-Danlos syndrome; key target for CRISPR knockout and knock-in studies [2,3] |
| DSE | Encodes dermatan sulfate epimerase 1 (DS-epi1), which converts glucuronic acid to iduronic acid in dermatan | Forms complexes with D4ST1 to generate iduronic acid blocks; knockout models reveal coordinated functions |
| CHST11 | Encodes chondroitin 4-O-sulfotransferase 1 (C4ST1), which transfers sulfate to chondroitin | Related enzyme with overlapping substrate specificity; useful for comparative studies |
| CHST12 | Encodes chondroitin 4-O-sulfotransferase 2 (C4ST2) | Another related sulfotransferase; potential redundancy with D4ST1 |
| CHST13 | Encodes chondroitin 4-O-sulfotransferase 3 (C4ST3) | Expressed in pituitary gland; may contribute to 4-O-sulfation of chondroitin/dermatan |
| CHST3 | Encodes chondroitin 6-O-sulfotransferase 1 (C6ST1) | Involved in 6-O-sulfation; provides contrast to 4-O-sulfation |
| UST | Encodes uronyl 2-O-sulfotransferase | Adds 2-O-sulfate to iduronic acid; works downstream of D4ST1 |
| PAPSS1 | Encodes 3'-phosphoadenosine 5'-phosphosulfate synthase 1 | Synthesizes PAPS, the sulfate donor for D4ST1 |
| PAPSS2 | Encodes 3'-phosphoadenosine 5'-phosphosulfate synthase 2 | Alternative PAPS synthase; affects sulfate availability |
| SLC35B2 | Encodes PAPS transporter | Transports PAPS into Golgi for sulfation reactions |
| SLC35B3 | Encodes PAPS transporter | Alternative PAPS transporter |
| B4GALT7 | Encodes galactosyltransferase I | Involved in glycosaminoglycan linker region synthesis; affects dermatan sulfate biosynthesis |
| B3GALT6 | Encodes galactosyltransferase II | Mutations cause connective tissue disorders; linked to glycosaminoglycan defects |
| XYLT1 | Encodes xylosyltransferase 1 | Initiates glycosaminoglycan chain synthesis; upstream of D4ST1 |
| XYLT2 | Encodes xylosyltransferase 2 | Alternative xylosyltransferase; affects dermatan sulfate production |
| EXT1 | Encodes exostosin glycosyltransferase 1 | Involved in heparan sulfate synthesis; not directly in dermatan sulfate but related |
| EXT2 | Encodes exostosin glycosyltransferase 2 | Similar to EXT1; provides comparative insights |
| CSGALNACT1 | Encodes chondroitin sulfate N-acetylgalactosaminyltransferase 1 | Adds GalNAc to chondroitin backbone; upstream of sulfation |
How Is dermatan 4-sulfotransferase activity Regulated?
Dermatan 4-sulfotransferase activity is regulated at multiple levels. The expression of CHST14, the gene encoding D4ST1, is controlled by transcription factors and epigenetic mechanisms, although specific regulators are not fully elucidated. The enzyme's activity depends on the availability of the sulfate donor PAPS, which is synthesized by PAPS synthases (PAPSS1/2) and transported into the Golgi by SLC35B2/B3. Additionally, the formation of a complex between D4ST1 and dermatan sulfate epimerase 1 (DS-epi1) enhances the coordinated epimerization and sulfation of dermatan sulfate, suggesting a regulatory role for protein-protein interactions. Post-translational modifications of D4ST1 may also influence its activity, but further research is needed.
dermatan 4-sulfotransferase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CHST14 | Musculocontractural Ehlers-Danlos syndrome (mcEDS) | CRISPR knockout of CHST14 in human fibroblasts or induced pluripotent stem cells; knock-in of patient mutations [2,3] |
| DSE | Connective tissue fragility and glycosaminoglycan defects | CRISPR knockout in chondrocytes or fibroblasts to study epimerization-sulfation coupling |
| CHST11 | Skeletal abnormalities and chondrodysplasia | Knockout mouse models and CRISPR-edited cell lines |
| CHST12 | Potential role in cancer and development | Overexpression and knockout in cancer cell lines |
| CHST13 | Pituitary gland function and hormone regulation | CRISPR knockout in pituitary cell lines |
Musculocontractural Ehlers-Danlos Syndrome (mcEDS)
Loss-of-function mutations in CHST14, which encodes D4ST1, cause musculocontractural Ehlers-Danlos syndrome (mcEDS), a rare congenital disorder characterized by connective tissue fragility, joint hypermobility, skin hyperextensibility, and multiple congenital anomalies [2,3]. The deficiency in dermatan 4-sulfotransferase activity leads to reduced dermatan sulfate with iduronic acid blocks, affecting extracellular matrix integrity and growth factor signaling. Recent advances have elucidated the pathophysiology, including impaired collagen fibrillogenesis and altered TGF-beta signaling.
Cancer and Tumor Progression
Dermatan sulfate and its sulfation patterns are implicated in cancer progression and metastasis. Altered expression of CHST14 and other sulfotransferases has been observed in various cancers, suggesting that dermatan 4-sulfotransferase activity may influence tumor cell behavior through modulation of the extracellular matrix and growth factor availability. However, the precise role of D4ST1 in cancer remains an active area of research.
Connective Tissue Disorders and Fibrosis
Dermatan sulfate is a key component of the extracellular matrix in connective tissues. Dysregulation of dermatan 4-sulfotransferase activity can lead to abnormal matrix remodeling, contributing to fibrosis and other connective tissue disorders. Studies on mcEDS have provided insights into how loss of D4ST1 affects collagen assembly and tissue homeostasis [2,3].
From dermatan 4-sulfotransferase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the effect of CHST14 loss on dermatan sulfate structure? | CRISPR knockout of CHST14 in HEK293T or fibroblasts followed by glycosaminoglycan analysis |
| How do patient-specific mutations in CHST14 affect enzyme activity? | Point mutation knock-in using CRISPR in cell lines, followed by sulfotransferase assays [2,3] |
| Can wild-type CHST14 rescue the mcEDS phenotype? | Knock-in of wild-type CHST14 into patient-derived iPSCs or overexpression in knockout cells |
| What is the interaction between D4ST1 and DS-epi1? | Tagged knock-in of CHST14 and DSE for co-immunoprecipitation and imaging |
| How does D4ST1 overexpression affect cancer cell behavior? | Overexpression of CHST14 in cancer cell lines and xenograft models |
| What are the transcriptional regulators of CHST14? | CRISPR interference (CRISPRi) or activation (CRISPRa) screens in relevant cell types |
How to Study the dermatan 4-sulfotransferase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| HPLC/MS | Disaccharide composition and sulfation pattern of dermatan sulfate | Analysis of dermatan sulfate from cells or tissues |
| Sulfotransferase assay | Enzymatic transfer of sulfate from PAPS to dermatan | Kinetic studies and mutant enzyme characterization |
| CRISPR-Cas9 knockout | Loss of gene function | Studying the effect of CHST14 deletion on dermatan sulfate [2,3] |
| CRISPR knock-in | Introduction of specific mutations | Modeling patient mutations in CHST14 |
| Co-immunoprecipitation | Protein-protein interactions | Detecting D4ST1-DS-epi1 complexes |
| RNA-seq | Transcriptional changes | Identifying genes regulated by D4ST1 activity |
| Immunofluorescence | Protein localization | Determining Golgi localization of D4ST1 |
| Glycosaminoglycan blotting | Presence of dermatan sulfate epitopes | Assessing dermatan sulfate in tissues |
Glycosaminoglycan Analysis
To study dermatan 4-sulfotransferase activity, researchers often analyze the structure of dermatan sulfate using techniques such as high-performance liquid chromatography (HPLC), mass spectrometry, and enzymatic digestion with chondroitinases. These methods reveal the degree of 4-O-sulfation and the presence of iduronic acid blocks, providing direct evidence of D4ST1 activity.
Sulfotransferase Activity Assays
In vitro sulfotransferase assays using recombinant D4ST1 and radiolabeled PAPS (35S-PAPS) can measure the transfer of sulfate to dermatan substrates. These assays are quantitative and can be used to assess the impact of mutations or inhibitors on enzyme activity.
CRISPR-Cas9 Genome Editing
CRISPR-Cas9 technology enables the generation of knockout, point mutation, and knock-in cell models to study the function of CHST14 and related genes [2,3]. These models allow researchers to dissect the specific contributions of dermatan 4-sulfotransferase activity to cellular processes and disease phenotypes.
Protein-Protein Interaction Studies
Co-immunoprecipitation, proximity ligation assays, and fluorescence resonance energy transfer (FRET) can be used to study the interaction between D4ST1 and DS-epi1, which is important for the coordinated synthesis of dermatan sulfate.
How CRISPR Can Be Used to Study GO:0001537 dermatan 4-sulfotransferase activity
Knockout
CRISPR knockout of CHST14 in cell lines such as HEK293T or patient fibroblasts results in the complete loss of dermatan 4-sulfotransferase activity, leading to reduced 4-O-sulfation of dermatan sulfate and altered iduronic acid block formation [1,2]. These models are valuable for studying the consequences of D4ST1 deficiency and for testing rescue strategies.
Point Mutation
CRISPR-mediated point mutations can replicate specific missense or nonsense mutations found in mcEDS patients, allowing researchers to assess the impact of these mutations on D4ST1 activity and stability [2,3]. Such models provide insights into genotype-phenotype correlations and can be used for drug screening.
Knock-in
Knock-in of wild-type or tagged CHST14 using CRISPR can restore or monitor dermatan 4-sulfotransferase activity in knockout cells. Tagged knock-in (e.g., GFP or FLAG) enables visualization and purification of D4ST1 for interaction studies.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression of CHST14 can increase dermatan 4-sulfotransferase activity, which is useful for studying the effects of enhanced dermatan sulfate synthesis on cell behavior and extracellular matrix properties.
How EDITGENE Supports dermatan 4-sulfotransferase activity Research
Researchers studying dermatan 4-sulfotransferase activity-related genes often need to determine whether a candidate gene is causally involved in dermatan sulfate biosynthesis, connective tissue integrity, or disease phenotypes. EDITGENE provides comprehensive CRISPR-based services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for dermatan 4-sulfotransferase activity research.
Frequently Asked Questions About dermatan 4-sulfotransferase activity
What is dermatan 4-sulfotransferase activity?
Dermatan 4-sulfotransferase activity (GO:0001537) is the enzymatic transfer of a sulfate group from PAPS to the 4-O position of N-acetylgalactosamine in dermatan, forming dermatan 4'-sulfate.
What genes are involved in dermatan 4-sulfotransferase activity?
The primary gene is CHST14, which encodes dermatan 4-O-sulfotransferase 1 (D4ST1). Other related genes include DSE, CHST11, CHST12, and CHST13 [1,4,5,6].
What diseases are associated with dermatan 4-sulfotransferase activity?
Mutations in CHST14 cause musculocontractural Ehlers-Danlos syndrome (mcEDS), a connective tissue disorder. Altered activity has also been implicated in cancer and fibrosis [2,3,8].
How is dermatan 4-sulfotransferase activity measured?
It is measured using sulfotransferase assays with radiolabeled PAPS, or by analyzing dermatan sulfate structure via HPLC and mass spectrometry [1,5].
What is the role of D4ST1 in dermatan sulfate biosynthesis?
D4ST1 catalyzes the 4-O-sulfation of GalNAc residues, which is essential for the formation of iduronic acid blocks and the functional properties of dermatan sulfate [1,4].
Can CRISPR be used to study dermatan 4-sulfotransferase activity?
Yes, CRISPR knockout, point mutation, and knock-in models of CHST14 and related genes are powerful tools to dissect the function of this activity [2,3].
What are the substrates of dermatan 4-sulfotransferase?
The substrates are dermatan (the acceptor) and 3'-phosphoadenylyl sulfate (PAPS, the sulfate donor).
Where is dermatan 4-sulfotransferase located in the cell?
It is a Golgi-resident enzyme, localized to the lumen of the Golgi apparatus where glycosaminoglycan biosynthesis occurs.
What is the difference between D4ST1 and chondroitin 4-sulfotransferase?
D4ST1 specifically sulfates dermatan, while chondroitin 4-sulfotransferases (e.g., C4ST1) act on chondroitin. They share sequence similarity but differ in substrate specificity.
How does loss of dermatan 4-sulfotransferase activity affect the extracellular matrix?
Loss of activity leads to reduced iduronic acid blocks and altered dermatan sulfate structure, impairing collagen fibrillogenesis and growth factor signaling, as seen in mcEDS [2,3].
Conclusion
Dermatan 4-sulfotransferase activity (GO:0001537) is a critical molecular function in glycosaminoglycan biosynthesis, essential for the formation of iduronic acid blocks in dermatan sulfate. Its dysregulation causes musculocontractural Ehlers-Danlos syndrome and has been implicated in cancer and fibrosis. Understanding the enzyme's mechanism, regulation, and disease relevance is facilitated by advanced CRISPR models and analytical methods. EDITGENE provides comprehensive services to support research on this important activity.
References
- 1. Pacheco B et al.. 2009. Dermatan 4-O-sulfotransferase 1 is pivotal in the formation of iduronic acid blocks in dermatan sulfate.. Glycobiology 19(11):1197-203 PMID: 19661164
- 2. Zhang L et al.. 2010. Congenital disorders of glycosylation with emphasis on loss of dermatan-4-sulfotransferase.. Prog Mol Biol Transl Sci 93:289-307 PMID: 20807649
- 3. Kosho T et al.. 2019. Recent Advances in the Pathophysiology of Musculocontractural Ehlers-Danlos Syndrome.. Genes (Basel) 11(1) PMID: 31905796
- 4. Tykesson E et al.. 2018. Dermatan sulfate epimerase 1 and dermatan 4-O-sulfotransferase 1 form complexes that generate long epimerized 4-O-sulfated blocks.. J Biol Chem 293(35):13725-13735 PMID: 29976758
- 5. Yamauchi S et al.. 2000. Molecular cloning and expression of chondroitin 4-sulfotransferase.. J Biol Chem 275(12):8975-81 PMID: 10722746
- 6. Okuda T et al.. 2000. Molecular cloning and characterization of GalNAc 4-sulfotransferase expressed in human pituitary gland.. J Biol Chem 275(51):40605-13 PMID: 11001942
- 7. He W et al.. 2017. Expression of chondroitin-4-O-sulfotransferase in Escherichia coli and Pichia pastoris.. Appl Microbiol Biotechnol 101(18):6919-6928 PMID: 28761999
- 8. Thelin MA et al.. 2013. Biological functions of iduronic acid in chondroitin/dermatan sulfate.. FEBS J 280(10):2431-46 PMID: 23441919
