Recombinant Human MDGA2 Protein: Research Guide & Applications

Recombinant Human MDGA2 Protein is a glycosylphosphatidylinositol (GPI)-anchored cell-surface protein belonging to the MAM domain-containing glycosylphosphatidylinositol anchor (MDGA) family, playing a critical role in modulating inhibitory synapse formation and neural circuit development.

Product Name

Recombinant Human MDGA2 Protein

SKU

rp369502

Protein Family

MAM domain-containing GPI-anchored (MDGA) protein family

Primary Research Area

Neuroscience, synapse biology, cell adhesion

Biological Function

Modulation of inhibitory and excitatory synapse formation via neuroligin interaction

Expression System

Mammalian or recombinant expression system (verify with datasheet)

Storage Recommendation

Store at -80°C; avoid repeated freeze-thaw cycles

Biological Background of MDGA2

MDGA2 (MAM Domain Containing Glycosylphosphatidylinositol Anchor 2) is a member of the MDGA protein family, which are glycosylphosphatidylinositol (GPI)-anchored cell-surface proteins. MDGA proteins are structurally characterized by an N-terminal MAM (meprin/A5-protein/receptor protein-tyrosine phosphatase mu) domain, immunoglobulin (Ig)-like domains, and a fibronectin type III (FN3) domain, all tethered to the outer leaflet of the plasma membrane via a GPI anchor.

MDGA2 is predominantly expressed in the nervous system, where it functions as a critical regulator of synaptogenesis. It exerts its effects primarily by interacting with neuroligins (NLGNs), key postsynaptic cell-adhesion molecules. By binding to neuroligin-2 (NLGN2) and neuroligin-1 (NLGN1), MDGA2 modulates both inhibitory and excitatory synapse development, thereby influencing the balance of neural excitation and inhibition. Dysregulation of MDGA2 has been associated with neurodevelopmental disorders including autism spectrum disorder (ASD) and schizophrenia, making it a compelling target for translational neuroscience research.

Product Specifications and Quality Standards

Recombinant Human MDGA2 Protein (SKU: rp369502) is produced using recombinant expression technology to ensure consistent batch-to-batch quality suitable for demanding research applications. Researchers should consult the official product datasheet (referenced as absea#PQ-810) for complete, lot-specific specifications including:

• Purity: Typically assessed by SDS-PAGE and/or HPLC; exact purity percentage should be confirmed on the datasheet.
• Endotoxin Level: Determined by LAL assay; critical for cell-based and in vivo studies. Confirm lot-specific values with the product datasheet.
• Formulation: Buffer composition, carrier proteins, and stabilizers; refer to the datasheet for exact formulation details.
• Molecular Weight: Determined by the amino acid sequence of the recombinant construct plus any post-translational modifications; confirm with the datasheet.
• Biological Activity: Functional activity may be validated by binding assay or cell-based assay; confirm assay method and results with the datasheet.

All specifications are lot-dependent. Always refer to the Certificate of Analysis (CoA) provided with each shipment for lot-specific data.

Handling, Reconstitution, and Storage Protocol

Proper handling of Recombinant Human MDGA2 Protein is essential to preserve its structural integrity and biological activity. Follow these general guidelines, and always defer to the specific instructions in the product datasheet:

Reconstitution

• Briefly centrifuge the vial before opening to consolidate lyophilized material (if supplied lyophilized).
• Reconstitute with the volume and buffer specified in the datasheet, typically sterile PBS or the supplied reconstitution buffer.
• Gently pipette to mix; avoid vortexing, which may denature the protein.
• Allow the reconstituted protein to equilibrate at room temperature for a few minutes before use.

Storage

• Store lyophilized protein at -20°C to -80°C, protected from moisture and light.
• Store reconstituted protein aliquoted at -80°C for long-term storage.
• Avoid repeated freeze-thaw cycles; each cycle may degrade protein activity.
• Add a carrier protein (e.g., 0.1% BSA) if storing dilute solutions, as recommended by the datasheet.

Working Concentration

• Optimal working concentrations must be determined empirically for each experimental system and application.

Research Applications

Recombinant Human MDGA2 Protein is a versatile research tool applicable across multiple experimental platforms in neuroscience and cell biology:

• Protein-Protein Interaction Studies: Used to investigate MDGA2 binding to neuroligins (NLGN1, NLGN2) and neurexins, elucidating mechanisms of synaptic regulation.
• Cell-Based Synaptogenesis Assays: Applied in co-culture and bead-based assays to study the role of MDGA2 in inhibiting or modulating synapse induction.
• Structural Biology: Suitable as an antigen or binding partner in crystallography, cryo-EM, or SPR (surface plasmon resonance) experiments to characterize MDGA2 domain architecture and interaction surfaces.
• Antibody Development and Validation: Serves as a standard antigen for immunizing animals to generate MDGA2-specific antibodies, or for validating existing antibodies by ELISA and Western blot.
• Drug Discovery and Screening: Useful as a binding target in high-throughput screening (HTS) assays to identify small molecules or biologics modulating MDGA2–neuroligin interactions, with relevance to ASD and psychiatric disease drug development.
• Functional Rescue Experiments: Applied in neuronal cell cultures to explore gain-of-function or rescue phenotypes related to MDGA2 deficiency.

Troubleshooting Common Issues

Researchers working with Recombinant Human MDGA2 Protein may encounter the following challenges. The guidance below reflects general best practices for recombinant GPI-anchored and extracellular domain proteins:

• Low or No Detectable Activity: Confirm proper reconstitution and storage conditions. Check that the protein has not undergone excessive freeze-thaw cycles. Verify that assay conditions (buffer, pH, temperature) are appropriate for MDGA2 activity. Ensure that the assay binding partner (e.g., neuroligin) is also functional.
• Protein Aggregation: If aggregation is suspected, briefly centrifuge at low speed (e.g., 5,000 × g, 5 min, 4°C) before use to remove aggregates. Consider adding a mild detergent or carrier protein as recommended in the datasheet.
• Unexpected Molecular Weight on SDS-PAGE: MDGA2 is a glycoprotein; glycosylation and other post-translational modifications can cause apparent molecular weight on SDS-PAGE to differ from the theoretical mass. Consult the datasheet for expected migration patterns.
• Weak Signal in ELISA or Western Blot: Optimize antibody concentrations, blocking conditions, and antigen loading. Confirm antibody specificity for the recombinant form being used.
• GPI Anchor Considerations: If a GPI-anchored form is used, standard solubilization protocols may require phosphatidylinositol-specific phospholipase C (PI-PLC) treatment or detergent solubilization. Consult the datasheet to determine whether the supplied product is the GPI-anchored form or a soluble ectodomain fragment.

Frequently asked questions

What is the biological function of MDGA2 and why is it relevant for neuroscience research?

MDGA2 is a GPI-anchored cell-surface protein that regulates synapse formation by interacting with neuroligins, key synaptic cell-adhesion molecules. It modulates the balance between excitatory and inhibitory synapses in the brain. Altered MDGA2 function has been linked to neurodevelopmental disorders such as autism spectrum disorder and schizophrenia, making it a high-priority research target.

How should Recombinant Human MDGA2 Protein (rp369502) be stored and handled to maintain activity?

The protein should be stored at -80°C and protected from repeated freeze-thaw cycles, which degrade activity. For lyophilized material, reconstitute with the buffer specified in the product datasheet and gently mix without vortexing. Aliquot reconstituted protein immediately and store unused portions at -80°C. Always refer to the product-specific datasheet for precise storage and reconstitution instructions.

What experimental applications is Recombinant Human MDGA2 Protein suitable for?

Recombinant Human MDGA2 Protein is suitable for a range of applications including protein-protein interaction studies (especially with neuroligins and neurexins), cell-based synaptogenesis assays, structural biology experiments (crystallography, cryo-EM, SPR), antibody development and validation, and drug discovery screening assays. Researchers should confirm suitability for each specific application by consulting the product datasheet.

Why does MDGA2 appear at a different molecular weight than expected on SDS-PAGE?

MDGA2 is a glycoprotein that undergoes post-translational modifications including N-glycosylation, which add mass and can cause the apparent molecular weight on SDS-PAGE to be higher than the calculated molecular weight derived from the amino acid sequence alone. This is a normal characteristic of glycoproteins expressed in mammalian systems. The expected migration pattern for each lot should be confirmed using the Certificate of Analysis or product datasheet.

Is Recombinant Human MDGA2 Protein (rp369502) suitable for in vivo studies?

Suitability for in vivo use depends on the endotoxin level, formulation, and purity of each specific lot. These parameters are detailed in the lot-specific Certificate of Analysis. Researchers planning in vivo experiments should carefully review the CoA and product datasheet, and contact Aladdin Scientific technical support for guidance on lot selection and dosing.

References

1. 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.
2. Pettem KL, et al. Interaction between autism-linked MDGAs and neuroligins suppresses inhibitory synapse development. Journal of Cell Biology. 2013.
3. Connor SA, et al. Association of Distinct Variants in MDGA2 and Autism Spectrum Disorder. Molecular Psychiatry. 2016.
4. Aladdin Scientific. Recombinant Human MDGA2 Protein, SKU rp369502. Product Datasheet absea#PQ-810.

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