Background and Biological Significance of ATP10D

ATP10D (ATPase Phospholipid Transporting 10D) is a member of the P4-ATPase subfamily of P-type ATPases, a class of transmembrane enzymes responsible for the ATP-dependent translocation of phospholipids across the lipid bilayer — a process known as lipid flipping. P4-ATPases maintain phospholipid asymmetry in cellular membranes, which is critical for membrane integrity, vesicle budding, cell signaling, and apoptosis.

ATP10D has been implicated in lipid homeostasis and metabolic regulation. Research suggests associations between ATP10D variants and obesity, type 2 diabetes susceptibility, and glucosylceramide transport. Recombinant Human ATP10D Protein provides researchers with a purified tool to investigate the enzyme's biochemical properties, substrate specificity, and potential as a therapeutic target.

Reconstitution and Preparation Protocol

Follow the steps below to reconstitute and prepare Recombinant Human ATP10D Protein (rp369107) for experimental use. Always refer to the product-specific datasheet supplied with your lot for confirmed buffer recommendations and concentration.

1. Equilibrate to room temperature: Allow the vial to equilibrate at room temperature for 5–10 minutes before opening to minimize condensation and protein aggregation risk.
2. Centrifuge briefly: Spin the vial at low speed (≈1,000 × g, 30 seconds) to collect any lyophilized material from the sides and cap before reconstitution.
3. Add reconstitution buffer: Reconstitute the protein by adding sterile, ultrapure water or the buffer specified on the datasheet (typically PBS, pH 7.4, or a Tris-based buffer) dropwise. Gently swirl — do not vortex — to dissolve. Avoid vigorous agitation, which can denature the protein or introduce bubbles.
4. Confirm concentration: Measure A280 absorbance or use a Bradford/BCA assay to verify the working concentration against the stated extinction coefficient or supplied standard.
5. Aliquot immediately: Divide reconstituted protein into single-use aliquots in low-binding microcentrifuge tubes to minimize freeze-thaw cycles. Label each aliquot with date, concentration, and lot number.

Storage Conditions and Stability Guidelines

Proper storage is essential to preserve enzymatic activity and structural integrity of Recombinant Human ATP10D Protein.

• Short-term (≤1 week): Store at 4°C in a suitable stabilizing buffer. Add a carrier protein (e.g., 0.1% BSA) if the protein will be used at very low concentrations to reduce adsorption to tube walls.
• Long-term: Store at −80°C. Lyophilized product may be stable at −20°C; confirm with the datasheet.
• Avoid repeated freeze-thaw cycles: Each cycle can cause denaturation, aggregation, and loss of activity. Single-use aliquots are strongly recommended.
• Minimize exposure to ambient temperature: Keep the protein on ice during experimental procedures.
• Carrier protein: When working at concentrations below 10 µg/mL, consider adding BSA (0.1%) to stabilize the protein and reduce non-specific binding.

Note: Specific stability data (e.g., shelf life after reconstitution) should be confirmed from the product datasheet. Storage recommendations above represent general best practices for recombinant proteins.

Experimental Applications and Usage Notes

Recombinant Human ATP10D Protein is suitable for the following research applications. Optimal conditions should be determined empirically for each specific assay system.

• Enzyme activity assays: ATP10D can be studied for its ATPase activity using colorimetric phosphate release assays (e.g., malachite green or BIOMOL Green reagent) in the presence of appropriate phospholipid substrates.
• Lipid transport and flippase assays: Reconstitute the protein into liposomes or proteoliposomes for fluorescence-based flippase activity assays using fluorescently labeled phospholipid analogs (e.g., NBD-labeled lipids).
• Protein–protein interaction studies: Use in pull-down assays or co-immunoprecipitation to identify interacting partners, particularly CDC50 family subunits required for P4-ATPase activity.
• Structural studies: Suitable as antigen for antibody generation or as a standard in Western blot experiments.
• Drug screening: Can be used as a target protein in inhibitor screening assays relevant to metabolic disease research.

Note: All application suitability should be verified against the product datasheet. Concentration ranges, incubation times, and assay conditions may require optimization.

Quality Control and Troubleshooting

To ensure experimental reproducibility and protein integrity, observe the following quality control practices:

• SDS-PAGE verification: Run a small aliquot on SDS-PAGE upon receipt and after reconstitution to verify apparent molecular weight and purity. ATP10D has a predicted molecular weight of approximately 130 kDa; confirm against the datasheet value for the specific recombinant construct.
• Endotoxin levels: For cell-based assays, confirm endotoxin levels are within acceptable limits (typically <1.0 EU/µg). This information is available on the product datasheet.
• Aggregation check: If visible particulates appear after reconstitution, centrifuge at 10,000 × g for 10 minutes at 4°C and use the supernatant. Aggregation may indicate improper storage or excessive agitation.
• Activity loss troubleshooting: If reduced activity is observed, check for freeze-thaw cycle history, storage temperature deviations, or buffer incompatibility. Ensure no reducing agents (e.g., DTT, β-ME) are present at concentrations incompatible with downstream assays.
• Lot-to-lot consistency: Record lot number for each experiment and retain a reference aliquot for comparison in future batches.