Recombinant Human MDGA2 Protein: Handling & Usage Protocol

Recombinant Human MDGA2 Protein is a research-grade reagent designed to support investigations into neuronal cell adhesion, synaptogenesis, and MAM-domain glycosylphosphatidylinositol anchor-related signaling pathways.

Product Name

Recombinant Human MDGA2 Protein

SKU

rp369495

Source Reference

absea#PP-3074

Protein Origin

Human (Homo sapiens)

Application

Cell adhesion assays, synapse formation studies, protein interaction assays

Storage Recommendation

Avoid repeated freeze-thaw cycles; aliquot upon first use

Background: MDGA2 Protein Biology

MDGA2 (MAM Domain-Containing Glycosylphosphatidylinositol Anchor 2) is a GPI-anchored cell surface protein belonging to the immunoglobulin superfamily. It plays a critical role in neuronal development, particularly in modulating synapse formation by interacting with synaptic organizing proteins. MDGA2 has been reported to regulate the interaction between neuroligin and neurexin, thereby influencing excitatory and inhibitory synapse balance. Research into MDGA2 is relevant to understanding neurodevelopmental conditions including autism spectrum disorder and schizophrenia.

Recombinant Human MDGA2 Protein (rp369495) provides researchers with a reliable tool for in vitro studies of these molecular interactions.

Reagent Preparation and Reconstitution

Materials required: Sterile deionized water or the recommended reconstitution buffer (refer to the product datasheet), microcentrifuge tubes, pipettes, and a refrigerated microcentrifuge.

1. Centrifugation: Before opening the vial, briefly centrifuge (1,000–2,000 × g, 30 seconds) to consolidate the lyophilized material at the bottom of the tube.
2. Reconstitution: Add the volume of sterile water or buffer specified on the product datasheet directly to the lyophilized cake. Do not vortex; instead, gently pipette up and down or allow the solution to stand for 5–10 minutes at room temperature.
3. Aliquoting: Upon complete dissolution, prepare single-use aliquots to avoid repeated freeze-thaw cycles, which can compromise protein activity and integrity.
4. Concentration check: If required, confirm protein concentration by absorbance measurement (A280) or a suitable protein assay (e.g., BCA or Bradford).

Note: Always consult the specific product datasheet (absea#PP-3074) for lot-specific reconstitution volumes and buffer recommendations.

Storage Conditions and Stability

Proper storage is essential to maintain the biological activity of Recombinant Human MDGA2 Protein:

• Short-term storage (up to 1 month): Store reconstituted protein at 4°C.
• Long-term storage: Store aliquots at −20°C or −80°C for extended periods. Addition of a carrier protein (e.g., 0.1% BSA) may help stabilize dilute solutions.
• Avoid: Repeated freeze-thaw cycles. Each cycle can lead to protein aggregation and loss of activity.
• Lyophilized form: Store the unreconstituted lyophilized protein as directed on the datasheet, typically at −20°C, desiccated and protected from light.

Refer to the product datasheet (absea#PP-3074) for lot-specific stability data.

Experimental Applications and Usage Guidelines

Recombinant Human MDGA2 Protein is suitable for a range of biochemical and cell biology applications, including but not limited to:

• Protein–protein interaction assays: Use in pull-down assays or surface plasmon resonance (SPR) to study MDGA2 binding partners such as neuroligins.
• Cell adhesion assays: Apply exogenous MDGA2 protein to investigate its modulatory role in cell adhesion and clustering.
• ELISA and Western blot standard: Use as a positive control or standard curve antigen in immunoassay development.
• Functional blocking studies: Evaluate the effect of MDGA2 on synapse formation by applying recombinant protein to neuronal cultures.

Working concentration: Optimal working concentrations must be determined empirically for each assay system. Begin with a titration range and refer to published literature for guidance.

For research use only. Not intended for therapeutic or diagnostic use.

Quality Control and Troubleshooting

Quality Control: Recombinant Human MDGA2 Protein (rp369495) is manufactured under controlled conditions. Refer to the Certificate of Analysis (CoA) provided with each lot for purity, molecular weight confirmation (SDS-PAGE), and activity data specific to your batch.

Troubleshooting common issues:

• Protein precipitation: If precipitation is observed upon reconstitution, gently warm the vial to 37°C for 5 minutes and mix by slow pipetting. Filter through a 0.22 µm membrane if necessary.
• Low activity: Ensure the protein was stored and handled correctly. Avoid sodium azide in buffers if functional assays are planned, as it may inhibit biological activity.
• Non-specific binding in assays: Include appropriate blocking steps (e.g., BSA or non-fat milk) and optimize buffer conditions.
• Unexpected molecular weight on SDS-PAGE: MDGA2 is a glycoprotein; glycosylation may cause the apparent molecular weight to differ from the theoretical value calculated from the amino acid sequence.

Frequently asked questions

What is the recommended reconstitution buffer for Recombinant Human MDGA2 Protein?

The recommended reconstitution buffer is specified on the product datasheet (absea#PP-3074) and the Certificate of Analysis provided with each lot. Sterile deionized water is commonly used; however, always refer to the lot-specific documentation for the most accurate guidance.

How should I store Recombinant Human MDGA2 Protein to maintain its activity?

After reconstitution, aliquot the protein into single-use volumes and store at −20°C or −80°C for long-term use, or at 4°C for short-term use (up to one month). Avoid repeated freeze-thaw cycles, as these can lead to protein aggregation and loss of biological activity.

Why does the apparent molecular weight of MDGA2 on SDS-PAGE differ from the predicted value?

MDGA2 is a glycoprotein, and post-translational glycosylation modifications can increase the apparent molecular weight on SDS-PAGE beyond what is predicted from the amino acid sequence alone. This is a normal characteristic of glycoproteins and does not indicate a product defect.

What applications is Recombinant Human MDGA2 Protein validated for?

Recombinant Human MDGA2 Protein is suitable for applications including protein-protein interaction studies (e.g., pull-down, SPR), cell adhesion assays, use as an ELISA or Western blot standard, and functional studies in neuronal cultures. Optimal concentrations should be determined empirically for each application.

References

1. Product Reference: absea#PP-3074, Recombinant Human MDGA2 Protein datasheet. Absea Biotechnology.
2. Lee K, et al. MDGAs interact selectively with neuroligin-2 but not other neuroligins to regulate inhibitory synapse development. Proceedings of the National Academy of Sciences. 2013.
3. Bhatt DL, et al. MDGA proteins: Emerging roles in synapse development and neuropsychiatric disease. Neuroscience Research. (Generic textbook-level reference; specific citation requires verification.)

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