GO:1904423 dehydrodolichyl diphosphate synthase complex: Components, Assembly and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1904423 describes the dehydrodolichyl diphosphate synthase complex, a protein complex that carries dehydrodolichyl diphosphate synthase activity.
• The complex catalyzes the synthesis of dehydrodolichyl diphosphate, a key intermediate in dolichol biosynthesis.
• DHDDS (dehydrodolichyl diphosphate synthase) is the catalytic subunit; in humans it functions as a homodimer, while some organisms use heteromeric complexes.
• Mutations in DHDDS cause retinitis pigmentosa 59 (RP59), an inherited retinal degeneration.
• Animal models, including Dhdds knock-in mice and Drosophila knockdown, reproduce retinal degeneration phenotypes.
• Research on this complex uses structural biology, CRISPR knockout/knock-in models, and retinal phenotyping.
Description
The dehydrodolichyl diphosphate synthase complex (GO:1904423) is a cellular component defined as a protein complex capable of dehydrodolichyl diphosphate synthase activity. This complex is responsible for the synthesis of dehydrodolichyl diphosphate, a long-chain polyisoprenoid that serves as a precursor for dolichol, a lipid essential for N-linked glycosylation and other cellular processes. The complex is conserved across eukaryotes, with the catalytic subunit encoded by DHDDS in humans. Understanding this complex is critical because mutations in DHDDS are linked to retinitis pigmentosa 59 (RP59), a progressive retinal degeneration. Moreover, the complex's role in dolichol biosynthesis connects it to broader metabolic and glycosylation pathways. Research into GO:1904423 spans structural characterization, disease modeling, and therapeutic development.
dehydrodolichyl diphosphate synthase complex At A Glance
| GO ID | GO:1904423 |
|---|---|
| GO term | dehydrodolichyl diphosphate synthase complex |
| Ontology | cellular_component |
| Synonym | none |
| Major function | Catalyzes dehydrodolichyl diphosphate synthesis |
| Catalytic subunit | DHDDS (dehydrodolichyl diphosphate synthase) |
| Associated disease | Retinitis pigmentosa 59 (RP59) |
| Subcellular location | Endoplasmic reticulum membrane |
| Conservation | Eukaryotes, from yeast to humans |
What Is GO:1904423?
GO:1904423, dehydrodolichyl diphosphate synthase complex, is a protein complex that possesses dehydrodolichyl diphosphate synthase activity, meaning it catalyzes the formation of dehydrodolichyl diphosphate from isopentenyl diphosphate and farnesyl diphosphate. This complex is a cellular component located in the endoplasmic reticulum membrane.
Why Is dehydrodolichyl diphosphate synthase complex Important in Cell Biology?
The dehydrodolichyl diphosphate synthase complex is essential for dolichol biosynthesis, which is required for N-linked glycosylation, GPI anchor synthesis, and other cellular processes. Dysfunction of this complex leads to retinitis pigmentosa 59, a blinding disease, and highlights its importance in retinal health. Studying this complex provides insights into lipid metabolism, glycosylation disorders, and potential therapeutic targets.
• Mutations in DHDDS cause retinitis pigmentosa 59, a progressive retinal degeneration.
• The complex is required for dolichol synthesis, which is vital for protein glycosylation.
• DHDDS is conserved from yeast to humans, making model organisms valuable for study.
• Knockdown of Dhdds in Drosophila leads to retinal degeneration, providing a model for RP59.
• Dhdds knock-in mouse models (T206A and K42E) mimic human RP59 phenotypes.
• The complex is a potential target for therapies aimed at glycosylation disorders.
• Structural studies of DHDDS reveal insights into its catalytic mechanism.
• The complex's role in the endoplasmic reticulum links it to lipid homeostasis.
• Understanding the complex can aid in diagnosing and treating inherited retinal degenerations.
• Research on this complex may uncover broader roles in development and disease.
What Happens During dehydrodolichyl diphosphate synthase complex?
Substrate Binding and Catalysis
In simple terms: The complex grabs building blocks and links them into a long chain.
The dehydrodolichyl diphosphate synthase complex catalyzes the condensation of isopentenyl diphosphate (IPP) with farnesyl diphosphate (FPP) to form dehydrodolichyl diphosphate, a polyisoprenoid chain. This reaction is processive, adding multiple IPP units to produce a long-chain product. The catalytic subunit DHDDS contains conserved aspartate-rich motifs essential for catalysis.
Product Release and Dolichol Synthesis
In simple terms: The long chain is released and further modified to become dolichol.
After synthesis, dehydrodolichyl diphosphate is dephosphorylated and reduced to form dolichol, which is then used in N-linked glycosylation and other pathways. The complex is localized to the endoplasmic reticulum membrane, where dolichol synthesis occurs.
Assembly of the Complex
In simple terms: The complex is built from one or more protein subunits.
In humans, DHDDS forms a homodimer, but in some organisms, such as Paramecium tetraurelia, it functions as a heteromeric complex with a partner protein. The assembly of the complex is critical for its enzymatic activity.
Regulation of Activity
In simple terms: The complex's activity can be turned up or down.
The activity of the dehydrodolichyl diphosphate synthase complex is regulated by substrate availability and possibly by post-translational modifications, though specific mechanisms are not fully elucidated. Mutations in DHDDS can alter its activity and lead to disease.
Key Genes Involved in GO:1904423 dehydrodolichyl diphosphate synthase complex
The following genes and proteins are key components or regulators of the dehydrodolichyl diphosphate synthase complex.
| Gene | Major Role | Research Relevance |
|---|---|---|
| DHDDS | Catalytic subunit of the complex | Mutations cause RP59; target for gene editing |
| DHDDS (Drosophila) | Ortholog of human DHDDS | Knockdown causes retinal degeneration |
| DHDDS (mouse) | Ortholog of human DHDDS | Knock-in models mimic RP59 |
| ALG6 | Glycosyltransferase, modifier of DHDDS phenotype | Modifier variant affects disease severity |
| Cis-prenyltransferase (Paramecium) | Heteromeric partner | Evolutionary insights into complex assembly |
| Farnesyl diphosphate synthase (FDPS) | Provides FPP substrate | Upstream of DHDDS in pathway |
| Isopentenyl diphosphate isomerase (IDI1) | Provides IPP substrate | Upstream of DHDDS |
| Dolichol kinase (DOLK) | Phosphorylates dolichol | Downstream of DHDDS |
| DPM1 | Dolichol-phosphate mannose synthase | Uses dolichol product |
| RFT1 | Flipase for dolichol-linked oligosaccharides | Glycosylation pathway |
| DDOST | Oligosaccharyltransferase subunit | N-glycosylation |
| STT3A | Oligosaccharyltransferase subunit | N-glycosylation |
| MAGT1 | Oligosaccharyltransferase subunit | N-glycosylation |
| TUSC3 | Oligosaccharyltransferase subunit | N-glycosylation |
| DHDDS (zebrafish) | Ortholog | Potential model for RP59 |
| DHDDS (rat) | Ortholog | Potential model for RP59 |
How Is dehydrodolichyl diphosphate synthase complex Regulated?
The dehydrodolichyl diphosphate synthase complex is primarily regulated by substrate availability and possibly by feedback mechanisms, but specific regulatory pathways are not well defined. Mutations in DHDDS can affect its activity, and modifier genes such as ALG6 can influence disease severity.
dehydrodolichyl diphosphate synthase complex and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| DHDDS | Retinitis pigmentosa 59 | Dhdds knock-in mouse |
| DHDDS | Retinal degeneration | Drosophila knockdown |
| DHDDS | Inherited retinal degeneration | Patient-derived iPSCs |
| ALG6 | Modifier of RP59 | ALG6 knockout mice |
| DHDDS | Glycosylation defects | Yeast models |
Retinitis Pigmentosa 59 (RP59)
Mutations in DHDDS, the catalytic subunit of the dehydrodolichyl diphosphate synthase complex, cause retinitis pigmentosa 59, an inherited retinal degeneration characterized by night blindness and progressive vision loss. The disease is typically autosomal recessive, and animal models have been developed to study its pathogenesis.
Congenital Disorders of Glycosylation (CDG)
Defects in dolichol biosynthesis, including those affecting the dehydrodolichyl diphosphate synthase complex, can lead to congenital disorders of glycosylation, a group of rare metabolic diseases with multisystem symptoms. However, direct links between DHDDS mutations and CDG are not well established.
Other Retinal Dystrophies
Beyond RP59, mutations in DHDDS may contribute to other retinal dystrophies, though the evidence is limited. Research into the complex's role in retinal health continues to expand.
From dehydrodolichyl diphosphate synthase complex-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does DHDDS mutation cause retinal degeneration? | Dhdds knock-in mouse |
| What is the role of DHDDS in retinal development? | Drosophila knockdown |
| How does DHDDS structure affect catalysis? | Recombinant protein |
| Can gene editing correct DHDDS mutations? | CRISPR knock-in in iPSCs |
| What modifiers affect RP59 severity? | ALG6 knockout mouse |
| Is DHDDS required for glycosylation? | Yeast knockout |
How to Study the dehydrodolichyl diphosphate synthase complex Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Electroretinography | Retinal function | Phenotyping RP59 models |
| Histology | Retinal structure | Assessing degeneration |
| Mass spectrometry | Enzymatic products | Activity assays |
| CRISPR/Cas9 | Gene editing | Creating disease models |
| RNA-seq | Gene expression | Pathway analysis |
| Western blot | Protein levels | Validation of knockout |
| Immunofluorescence | Protein localization | Subcellular localization |
Structural Characterization
Integrative computational and experimental approaches, such as homology modeling and cross-linking mass spectrometry, have been used to determine the structure of full-length human DHDDS. These methods reveal the dimeric architecture and catalytic site.
Animal Models and Phenotyping
Knock-in mouse models carrying Dhdds mutations (T206A, K42E) are used to study retinal degeneration through electroretinography, histology, and optical coherence tomography. Drosophila knockdown models allow rapid genetic screening.
Enzymatic Activity Assays
Dehydrodolichyl diphosphate synthase activity can be measured using radiolabeled substrates and thin-layer chromatography or mass spectrometry to detect product formation.
CRISPR-Based Editing
CRISPR/Cas9 is used to introduce precise mutations in DHDDS in cell lines and animal models to study disease mechanisms and test therapies.
How CRISPR Can Be Used to Study GO:1904423 dehydrodolichyl diphosphate synthase complex
Knockout
CRISPR knockout of DHDDS in cell lines or animal models can abolish dehydrodolichyl diphosphate synthase activity, leading to dolichol depletion and retinal degeneration phenotypes. Knockout models help define the complex's essential functions.
Point Mutation
CRISPR point mutation, such as Dhdds T206A or K42E, recapitulates human RP59 mutations in mice, allowing study of disease mechanisms and potential therapies.
Knock-in
Knock-in of tagged DHDDS (e.g., GFP) enables visualization and purification of the complex for biochemical and imaging studies.
Overexpression
Overexpression of DHDDS in cell lines can increase dehydrodolichyl diphosphate synthase activity and dolichol levels, useful for studying downstream effects and drug screening.
How EDITGENE Supports dehydrodolichyl diphosphate synthase complex Research
Researchers studying dehydrodolichyl diphosphate synthase complex-related genes often need to determine whether a candidate gene is causally involved in retinal degeneration or glycosylation disorders. EDITGENE provides CRISPR-based services to create precise cellular and animal models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for dehydrodolichyl diphosphate synthase complex research.
Frequently Asked Questions About dehydrodolichyl diphosphate synthase complex
What is the dehydrodolichyl diphosphate synthase complex?
It is a protein complex (GO:1904423) that catalyzes the synthesis of dehydrodolichyl diphosphate, a precursor for dolichol.
What genes are involved in the dehydrodolichyl diphosphate synthase complex?
The main gene is DHDDS, which encodes the catalytic subunit; other genes like ALG6 can modify its function.
What diseases are associated with the dehydrodolichyl diphosphate synthase complex?
Mutations in DHDDS cause retinitis pigmentosa 59, and defects may contribute to glycosylation disorders.
How is the dehydrodolichyl diphosphate synthase complex studied?
Researchers use structural biology, animal models, enzymatic assays, and CRISPR editing.
What is the function of DHDDS?
DHDDS is the catalytic subunit that synthesizes dehydrodolichyl diphosphate from IPP and FPP.
What animal models exist for RP59?
Dhdds knock-in mice and Drosophila knockdown models are available.
Can CRISPR be used to model DHDDS mutations?
Yes, CRISPR/Cas9 can introduce precise mutations like T206A or K42E in DHDDS to mimic human disease.
What is the subcellular location of the dehydrodolichyl diphosphate synthase complex?
It is located in the endoplasmic reticulum membrane.
Is the dehydrodolichyl diphosphate synthase complex conserved?
Yes, it is conserved from yeast to humans, with orthologs in many eukaryotes.
What are the symptoms of retinitis pigmentosa 59?
Symptoms include night blindness and progressive vision loss due to retinal degeneration.
Conclusion
The dehydrodolichyl diphosphate synthase complex (GO:1904423) is a critical enzyme complex in dolichol biosynthesis, with essential roles in glycosylation and retinal health. Mutations in its catalytic subunit DHDDS lead to retinitis pigmentosa 59, and ongoing research using CRISPR models and structural approaches continues to unravel its mechanisms. Targeting this complex may offer therapeutic avenues for inherited retinal degenerations and glycosylation disorders.
References
- 2. Monson E et al.. 2024. Inherited Retinal Degeneration Caused by Dehydrodolichyl Diphosphate Synthase Mutation-Effect of an ALG6 Modifier Variant.. Int J Mol Sci 25(2) PMID: 38256083
- 3. Brandwine T et al.. 2021. Knockdown of Dehydrodolichyl Diphosphate Synthase in the Drosophila Retina Leads to a Unique Pattern of Retinal Degeneration.. Front Mol Neurosci 14:693967 PMID: 34290587
- 4. Lisnyansky Bar-El M et al.. 2019. Structural Characterization of Full-Length Human Dehydrodolichyl Diphosphate Synthase Using an Integrative Computational and Experimental Approach.. Biomolecules 9(11) PMID: 31661879
- 5. Nguyen MN et al.. 2025. Dhdds T206A and Dhdds K42E knock-in mouse models of retinitis pigmentosa 59 are phenotypically similar.. Dis Model Mech 18(7) PMID: 40574710
- 6. Fliesler SJ et al.. 2022. Vertebrate Animal Models of RP59: Current Status and Future Prospects.. Int J Mol Sci 23(21) PMID: 36362109
- 7. Onysk A et al.. 2026. Evolutionary divergence and functional insights into the heteromeric cis-prenyltransferase of Paramecium tetraurelia.. FEBS J 293(6):1681-1707 PMID: 40847593
- 8. Adam MP et al.. 1993. Congenital Disorders of N-Linked Glycosylation and Multiple Pathway Overview – RETIRED CHAPTER, FOR HISTORICAL REFERENCE ONLY.. PMID: 20301507
