Protein Background and Biological Significance

GPAM (Glycerol-3-Phosphate Acyltransferase, Mitochondrial), also known as GPAT1, is the mitochondria-associated isoform of the glycerol-3-phosphate acyltransferase enzyme family. It catalyzes the first and rate-limiting step in the de novo biosynthesis of glycerolipids: the transfer of a fatty acyl group from acyl-CoA to the sn-1 position of glycerol-3-phosphate, generating lysophosphatidic acid (LPA).

This reaction commits the glycerol-3-phosphate backbone to triacylglycerol (TAG) and glycerophospholipid synthesis, making GPAM a pivotal regulatory node in lipid homeostasis. GPAM is predominantly expressed in the liver and adipose tissue and is transcriptionally regulated by insulin and sterol regulatory element-binding proteins (SREBPs), linking it to broader metabolic signaling networks.

Research into GPAM has significant implications for understanding metabolic disorders such as obesity, non-alcoholic fatty liver disease (NAFLD), and type 2 diabetes, where dysregulated lipid biosynthesis plays a central role. Recombinant Human GPAM Protein provides researchers with a well-characterized tool for in vitro mechanistic and pharmacological studies.

Reconstitution and Handling Protocol

Proper reconstitution and handling of Recombinant Human GPAM Protein are essential to preserve enzymatic activity and ensure reproducible experimental results. Follow these guidelines carefully:

• Centrifugation before opening: Briefly centrifuge the vial at low speed (e.g., 2,000–5,000 × g for 30 seconds) before opening to collect any lyophilized material from the tube walls and cap.
• Reconstitution buffer: Reconstitute the protein in the buffer recommended on the product datasheet. In the absence of specific instructions, sterile deionized water or PBS (pH 7.2–7.4) supplemented with a carrier protein (e.g., 0.1% BSA) is generally appropriate. Avoid vigorous vortexing; mix gently by pipetting or brief rotation.
• Reconstitution volume: Add the recommended volume slowly along the vial wall. Allow the lyophilized cake to dissolve completely at room temperature for 5–10 minutes before use.
• Protein concentration verification: Measure protein concentration using a validated method (e.g., BCA or Bradford assay) prior to downstream experiments.
• Working aliquots: Prepare single-use aliquots to minimize freeze-thaw cycles. Label aliquots with date of reconstitution and store immediately under recommended conditions.

As a membrane-associated enzyme, GPAM may require detergent or specific lipid environments for optimal activity in certain biochemical assays. Consult the product datasheet and relevant literature for assay-specific considerations.

Storage Conditions and Stability

Maintaining the stability of Recombinant Human GPAM Protein requires adherence to recommended storage conditions:

• Lyophilized form: Store lyophilized protein at -20°C or -80°C, protected from moisture and light. Under these conditions, lyophilized protein typically retains activity for 12–24 months. Refer to the product Certificate of Analysis (CoA) for lot-specific expiry information.
• Reconstituted protein: Once reconstituted, aliquot immediately and store at -80°C for long-term use, or at -20°C for short-term use (up to 1 month). Addition of a carrier protein such as 0.1% BSA or glycerol (10–50%) can enhance stability during storage.
• Freeze-thaw cycles: Minimize freeze-thaw cycles to no more than 2–3. Each freeze-thaw event can result in protein aggregation, loss of enzymatic activity, and reduced experimental reproducibility.
• Working solutions: Freshly prepare working dilutions on the day of the experiment. Do not re-freeze diluted working solutions.
• Temperature during handling: Keep the protein on ice during experimental setup to prevent degradation.

If precipitation or turbidity is observed upon reconstitution, centrifuge briefly and use the supernatant. Discard any aliquots showing signs of contamination or significant activity loss.

Experimental Applications and Assay Considerations

Recombinant Human GPAM Protein is suitable for a range of biochemical and cell-free experimental formats:

• Enzyme activity assays: GPAM catalytic activity can be measured by monitoring the transfer of a radiolabeled or fluorescent acyl group from acyl-CoA to glycerol-3-phosphate. Thin-layer chromatography (TLC) or liquid scintillation counting are standard readout methods. Ensure appropriate detergent conditions to maintain the enzyme in an active conformation.
• Inhibitor screening: Recombinant GPAM is suitable for high-throughput or focused inhibitor screening campaigns targeting glycerolipid biosynthesis, relevant to metabolic disease drug discovery.
• Protein–protein interaction studies: Co-immunoprecipitation (Co-IP), pull-down assays, or surface plasmon resonance (SPR) experiments can be used to investigate GPAM interactions with other components of the lipid biosynthesis machinery.
• Structural studies: Recombinant protein preparations can serve as starting material for biophysical characterization, including circular dichroism (CD) spectroscopy to assess secondary structure integrity.
• Antibody validation: Recombinant GPAM can be used as a positive control antigen in Western blotting or ELISA to validate GPAM-specific antibodies.

Important note: As GPAM is an integral membrane protein, its activity and solubility in cell-free systems may be influenced by detergent choice, lipid supplementation, and buffer composition. Optimization of these parameters is recommended before initiating large-scale experiments.

Quality, Safety, and Regulatory Considerations

Recombinant Human GPAM Protein (rp368127) from Aladdin Scientific is produced for research use only (RUO) and is not intended for diagnostic, therapeutic, or clinical applications.

• Purity and quality: Each lot is subject to quality control testing. Consult the product-specific Certificate of Analysis (CoA) for purity grade, endotoxin level, and activity data relevant to your lot.
• Biosafety: Although this protein is of human origin and produced recombinantly (not isolated from native human tissue), standard laboratory biosafety practices (BSL-1 minimum) should be followed. Consult your institution's biosafety guidelines and Safety Data Sheet (SDS) prior to use.
• Disposal: Dispose of protein solutions and contaminated materials in accordance with institutional and local regulatory requirements for biological reagents.
• Export and import compliance: Verify applicable export control regulations if shipping internationally.
• Lot-to-lot variability: For reproducibility-sensitive experiments, source sufficient material from a single lot. Contact Aladdin Scientific technical support for lot reservation inquiries.

For questions regarding product specifications, regulatory documentation, or technical troubleshooting, contact Aladdin Scientific customer support or consult the online product page for rp368127.