Recombinant Human DHDDS Protein: Expression & Usage Protocol

Recombinant Human DHDDS Protein is a key research reagent enabling scientists to investigate dehydrodolichyl diphosphate synthase function, dolichol biosynthesis, and N-linked protein glycosylation pathways in vitro.

Product Name

Recombinant Human DHDDS Protein

SKU

rp372245

Protein Function

Catalyzes the synthesis of dehydrodolichyl diphosphate, a key intermediate in dolichol biosynthesis required for N-linked glycosylation

Species Origin

Human (Homo sapiens)

Recommended Storage

-80°C for long-term storage; avoid repeated freeze-thaw cycles

Application

Biochemical assays, enzyme activity studies, glycosylation pathway research, structural studies

Background: DHDDS Protein and Its Biological Role

Dehydrodolichyl diphosphate synthase (DHDDS) is a cis-prenyltransferase enzyme encoded by the DHDDS gene in humans. It catalyzes the elongation of farnesyl diphosphate (FPP) by sequential condensation with isopentenyl diphosphate (IPP) units to generate dehydrodolichyl diphosphate (DedolPP), the direct precursor of dolichol.

Dolichol is an essential lipid carrier required for N-linked protein glycosylation in the endoplasmic reticulum (ER). Disruption of DHDDS activity leads to defects in dolichol synthesis, impaired N-glycosylation, and is associated with congenital disorders of glycosylation (CDG) as well as retinitis pigmentosa. Recombinant Human DHDDS Protein (rp372245) enables in vitro characterization of these enzymatic processes.

Reagent Preparation and Reconstitution

Materials required: Sterile deionized water or appropriate reconstitution buffer (e.g., PBS pH 7.4 with carrier protein such as 0.1% BSA), low-binding microcentrifuge tubes, ice.

1. Equilibrate the vial: Allow the lyophilized protein vial to equilibrate to room temperature (approximately 15–25°C) for 10–15 minutes before opening to minimize condensation.
2. Reconstitution: Gently add the recommended volume of sterile reconstitution buffer directly to the lyophilized pellet. Do not vortex; instead, gently pipette up and down or swirl to dissolve. Refer to the product datasheet for the specific reconstitution volume.
3. Equilibration: Allow the reconstituted solution to stand on ice for 5 minutes to ensure complete dissolution.
4. Aliquoting: Prepare single-use aliquots immediately after reconstitution to avoid repeated freeze-thaw cycles, which can reduce protein activity and stability.

Note: The specific reconstitution volume and buffer conditions should be confirmed against the product-specific datasheet supplied with SKU rp372245. Flag for review if datasheet values differ.

Storage Conditions and Stability

Proper storage is critical to maintaining the activity and integrity of Recombinant Human DHDDS Protein:

• Long-term storage: Store lyophilized protein at -80°C. Under these conditions, the protein is stable for the period indicated on the product datasheet.
• Short-term storage: Reconstituted protein may be stored at 4°C for up to 48–72 hours if immediate use is planned. For longer periods, store aliquots at -80°C.
• Freeze-thaw cycles: Limit to a maximum of 2–3 freeze-thaw cycles. Each cycle may result in loss of enzymatic activity.
• Carrier protein: Adding 0.1% BSA (bovine serum albumin) to the storage buffer can improve stability during freeze-thaw and at low protein concentrations.

Note: Specific stability data and expiry information should be verified on the product-specific datasheet for rp372245.

Experimental Applications and Assay Protocols

Recombinant Human DHDDS Protein (rp372245) is suitable for multiple research applications:

1. Enzyme Activity Assay (Prenyltransferase Activity)

DHDDS catalyzes transfer of isopentenyl units onto farnesyl diphosphate. A standard radiometric or fluorometric assay can be performed by incubating the protein with FPP and IPP substrates in appropriate reaction buffer, followed by extraction and quantification of the polyprenyl product. Specific buffer compositions, substrate concentrations, and incubation times should be optimized empirically.

2. Protein–Protein Interaction Studies

DHDDS is known to form a complex with NUS1 (Nogo-B receptor, NgBR) in vivo. Co-immunoprecipitation or pull-down assays using Recombinant Human DHDDS Protein can be used to map interaction domains and screen inhibitors.

3. Structural and Biophysical Characterization

The recombinant protein can serve as antigen for antibody production, as a standard in Western blot assays, or as a substrate for crystallography and cryo-EM studies investigating enzyme conformation.

4. CDG Disease Model Research

Researchers studying congenital disorders of glycosylation (CDG) can use this protein to validate pathogenic variants or assess rescue of enzyme activity by small molecules.

Quality Control and Troubleshooting

Quality Control: Recombinant Human DHDDS Protein from Aladdin Scientific is manufactured under controlled conditions. Each lot is typically tested for purity by SDS-PAGE and for biological activity. Verify lot-specific QC data on the Certificate of Analysis (CoA) provided with the product.

Common Issues and Solutions:

Issue	Possible Cause	Recommended Action
Low or no enzyme activity	Protein denaturation due to improper storage or excessive freeze-thaw	Use freshly reconstituted aliquots; store at -80°C; add BSA as carrier
Precipitation after reconstitution	Incorrect buffer pH or salt concentration	Use recommended buffer; centrifuge at low speed and use supernatant
Unexpected band size on SDS-PAGE	Protein modification, tag, or degradation	Consult CoA for expected MW; verify under reducing and non-reducing conditions
High background in binding assay	Non-specific protein adsorption	Block surfaces with 1–3% BSA; use low-binding plasticware

Frequently asked questions

What is the recommended reconstitution buffer for Recombinant Human DHDDS Protein?

The protein is typically reconstituted in sterile PBS (pH 7.4) supplemented with 0.1% BSA as a carrier protein to enhance stability. Always refer to the product-specific datasheet supplied with SKU rp372245 for the exact recommended buffer and volume, as formulations may vary by lot.

How should Recombinant Human DHDDS Protein be stored to maintain activity?

Lyophilized protein should be stored at -80°C until reconstitution. After reconstitution, prepare single-use aliquots and store at -80°C. Limit freeze-thaw cycles to no more than 2–3 times. Short-term storage at 4°C is acceptable for up to 48–72 hours if the protein will be used immediately.

What experimental applications is Recombinant Human DHDDS Protein suitable for?

Recombinant Human DHDDS Protein (rp372245) is suitable for enzyme activity assays (cis-prenyltransferase activity), protein–protein interaction studies (e.g., with NUS1/NgBR), antibody production, Western blot standards, and structural biology applications such as crystallography or cryo-EM. It is also used in CDG disease model research to study dolichol biosynthesis defects.

What is the biological significance of the DHDDS enzyme?

DHDDS is a cis-prenyltransferase that synthesizes dehydrodolichyl diphosphate, the precursor of dolichol. Dolichol is an essential lipid carrier for N-linked glycosylation in the endoplasmic reticulum. Mutations in the DHDDS gene are associated with congenital disorders of glycosylation (CDG) and retinitis pigmentosa, making it a clinically relevant research target.

How do I verify the quality of the received Recombinant Human DHDDS Protein?

Upon receipt, verify lot-specific purity and activity data on the Certificate of Analysis (CoA) included with the shipment. SDS-PAGE can be used to confirm purity and approximate molecular weight. Functional enzyme activity assays using FPP and IPP as substrates provide confirmation of biological activity. Contact Aladdin Scientific technical support if results are inconsistent with the CoA.

References

1. Cantagrel V, Lefeber DJ. From glycosylation disorders to dolichol biosynthesis defects: a new class of metabolic disease. J Inherit Metab Dis. 2011;34(4):859-867. doi:10.1007/s10545-011-9301-0
2. Endo S, Zhang YW, Takahashi S, Koyama T. Identification of human dehydrodolichyl diphosphate synthase gene. Biochim Biophys Acta. 2003;1625(3):291-295. doi:10.1016/s0167-4781(02)00628-4
3. Zelinger L, Banin E, Obolensky A, et al. A missense mutation in DHDDS, encoding dehydrodolichyl diphosphate synthase, is associated with autosomal-recessive retinitis pigmentosa in Ashkenazi Jews. Am J Hum Genet. 2011;88(2):207-215. doi:10.1016/j.ajhg.2011.01.002
4. Grabińska KA, Park EJ, Sessa WC. cis-Prenyltransferase: New Insights into Protein Glycosylation, Rubber Synthesis, and Human Diseases. J Biol Chem. 2016;291(35):18582-18590. doi:10.1074/jbc.R116.739490

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.