Recombinant Human MDGA1 Protein: Research Guide & Applications

Recombinant Human MDGA1 Protein is a key research reagent for investigating synaptic organization, neuroligin-mediated cell adhesion, and neurodevelopmental signaling pathways in vitro and in biochemical assays.

Product Name

Recombinant Human MDGA1 Protein

SKU

rp369494

Protein Family

MAM domain-containing glycosylphosphatidylinositol anchor (MDGA) family

Primary Research Area

Synaptic biology, neurodevelopment, cell adhesion

Key Interaction Partner

Neuroligin (NLGN) family members

Recommended Storage

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

Supplier Reference

absea#PP-11241

Biological Background and Significance of MDGA1

MDGA1 (MAM Domain-Containing Glycosylphosphatidylinositol Anchor 1) is a cell-surface protein belonging to the immunoglobulin superfamily. It is characterized by the presence of multiple immunoglobulin-like (Ig) domains, a fibronectin type III (FNIII) domain, and a MAM (meprin/A5-protein/receptor protein-tyrosine phosphatase mu) domain, which together facilitate protein–protein interactions at the cell surface.

MDGA1 is predominantly expressed in the nervous system, where it plays a critical regulatory role in synapse formation and maturation. Notably, MDGA1 has been identified as an endogenous inhibitor of neuroligin (NLGN) family members—particularly NLGN2—by directly binding to neuroligins and preventing their interaction with presynaptic neurexins. This regulatory axis is fundamental to maintaining the balance between excitatory and inhibitory (E/I) synaptic transmission.

Dysregulation of MDGA1 expression or function has been associated with neurological and psychiatric conditions including autism spectrum disorder (ASD), schizophrenia, and epilepsy, making it a clinically relevant target for basic and translational neuroscience research.

Protein Specifications and Quality Considerations

Recombinant Human MDGA1 Protein (rp369494) is produced using standard recombinant expression systems designed to yield a biologically active protein suitable for in vitro research applications. When evaluating this or any recombinant protein, researchers should consider the following quality parameters:

• Purity: Recombinant proteins intended for binding assays and functional studies should ideally exceed 90% purity as assessed by SDS-PAGE or HPLC. Researchers are advised to request a Certificate of Analysis (CoA) for lot-specific purity data.
• Endotoxin levels: Low endotoxin content is critical for cell-based assays. Endotoxin levels should be confirmed from the CoA prior to use in cell culture experiments.
• Biological activity: Where applicable, activity should be confirmed through binding assays with known interaction partners such as neuroligin family members.
• Glycosylation and post-translational modifications: The expression host system (e.g., mammalian HEK293, insect Sf9, or E. coli) will influence the glycosylation state of the protein and may affect its folding, stability, and binding activity. Confirm the expression system used from the product datasheet.

For lot-specific specifications including molecular weight, formulation buffer, and concentration, always refer to the current Certificate of Analysis available through Aladdin Scientific.

Handling, Reconstitution, and Storage Protocol

Proper handling of Recombinant Human MDGA1 Protein is essential to preserve its biological activity and ensure reproducible experimental results. Follow the guidelines below:

1. Upon receipt: Inspect the vial immediately. If supplied lyophilized, store at -80°C until ready for use. If supplied as a liquid, store at -80°C and place on ice during handling.
2. Reconstitution (lyophilized product): Allow the vial to equilibrate to room temperature for 10–15 minutes before opening. Reconstitute in the buffer recommended on the product datasheet (typically sterile PBS or a low-salt buffer containing a carrier protein such as 0.1% BSA to enhance stability). Add reconstitution buffer slowly along the side of the vial and gently swirl—do not vortex—to minimize protein denaturation.
3. Aliquoting: Prepare single-use aliquots immediately after reconstitution to avoid repeated freeze-thaw cycles, which can lead to protein aggregation and loss of activity.
4. Storage: Store aliquots at -80°C. For short-term use (up to 1 week), aliquots may be stored at 4°C. Do not refreeze thawed aliquots.
5. Working concentration: Determine the optimal working concentration empirically for each assay format. Typical binding assay concentrations range in the nanomolar to low micromolar range, but must be validated for each specific experimental system.

Always consult the lot-specific datasheet for any product-specific reconstitution volumes or buffer recommendations that may supersede general guidelines.

Research Applications of Recombinant Human MDGA1 Protein

Recombinant Human MDGA1 Protein is a versatile research tool applicable across multiple experimental platforms in neuroscience and cell biology. Key applications include:

• Protein–protein interaction studies: MDGA1 is well-suited for surface plasmon resonance (SPR), biolayer interferometry (BLI), co-immunoprecipitation (co-IP), and pull-down assays to characterize its binding kinetics and affinity with neuroligin family members (e.g., NLGN1, NLGN2, NLGN3) and other putative interaction partners.
• ELISA and binding assays: Recombinant MDGA1 can serve as a capture or detection antigen in sandwich ELISA formats to study MDGA1–NLGN interaction inhibition or to screen small-molecule modulators.
• Structural biology: As a component in crystallography or cryo-EM studies aiming to elucidate the three-dimensional architecture of MDGA1 alone or in complex with neuroligins.
• Functional blocking experiments: Addition of soluble recombinant MDGA1 to neuronal cultures may be used to probe its role in modulating inhibitory synapse density and E/I balance.
• Antibody development and validation: Recombinant MDGA1 can serve as an immunogen for antibody generation or as a standard antigen for validating anti-MDGA1 antibody specificity in Western blot, ELISA, or immunofluorescence applications.
• Drug discovery: Used as a tool protein in high-throughput screening campaigns targeting the MDGA1–neuroligin interaction interface for therapeutic development in ASD or schizophrenia.

Experimental Tips and Troubleshooting

To maximize the performance of Recombinant Human MDGA1 Protein in your assays, consider the following practical recommendations:

• Protein aggregation: If aggregation is observed after reconstitution, centrifuge the solution at 10,000–14,000 × g for 10 minutes at 4°C before use to pellet aggregates. Including a low concentration of non-ionic detergent (e.g., 0.01% Tween-20) or carrier protein (0.1% BSA) in the working buffer may help prevent aggregation.
• Loss of activity after storage: Ensure aliquots are snap-frozen in liquid nitrogen before storage at -80°C. Never store protein at -20°C for extended periods, as frost-free freezers with repeated temperature cycling can accelerate degradation.
• Inconsistent binding results: Verify that the pH and ionic strength of your assay buffer are optimized. MDGA1–neuroligin interactions may be sensitive to buffer composition; pilot experiments testing a range of conditions are recommended.
• Non-specific binding in ELISA: Block microplate wells thoroughly (1–3% BSA or 5% non-fat milk in PBS-T) and titrate protein concentrations to identify the linear detection range.
• Lot-to-lot variability: Always run a positive control (e.g., a known concentration of MDGA1 from a validated lot) alongside new lots to confirm consistent performance. Contact Aladdin Scientific technical support if significant variability is observed.

Frequently asked questions

What is the recommended storage condition for Recombinant Human MDGA1 Protein?

Recombinant Human MDGA1 Protein should be stored at -80°C upon receipt. After reconstitution, prepare single-use aliquots and store at -80°C to avoid activity loss from repeated freeze-thaw cycles. Short-term storage at 4°C is acceptable for up to one week.

What are the primary research applications for Recombinant Human MDGA1 Protein?

Recombinant Human MDGA1 Protein is used in protein–protein interaction assays (SPR, BLI, co-IP, pull-down), ELISA, structural biology studies, functional blocking experiments in neuronal cultures, antibody development and validation, and drug discovery screening targeting MDGA1–neuroligin interactions relevant to ASD and schizophrenia research.

What is the biological function of MDGA1 in the nervous system?

MDGA1 functions as an endogenous regulator of synaptic organization by directly binding to neuroligin family members and preventing their interaction with presynaptic neurexins. This regulatory role modulates inhibitory synapse formation and is critical for maintaining the balance between excitatory and inhibitory synaptic transmission. Disruption of MDGA1 function has been linked to neurological conditions such as ASD, schizophrenia, and epilepsy.

How should I reconstitute lyophilized Recombinant Human MDGA1 Protein?

Allow the vial to equilibrate to room temperature for 10–15 minutes before opening. Reconstitute using the buffer specified on the product datasheet—typically sterile PBS or a low-salt buffer containing 0.1% BSA as a carrier protein. Add the buffer slowly along the vial wall and gently swirl to mix; do not vortex. Always consult the lot-specific datasheet for exact reconstitution volumes.

Can Recombinant Human MDGA1 Protein be used for antibody validation?

Yes. Recombinant Human MDGA1 Protein is suitable for use as a standard antigen to validate anti-MDGA1 antibody specificity across multiple detection formats, including Western blot, ELISA, and immunofluorescence. It may also serve as an immunogen for the generation of new anti-MDGA1 antibodies.

References

1. Elegheert J, et al. Structural mechanism for modulation of synaptic neuroligin-neurexin signaling by MDGA proteins. Neuron. 2017.
2. Lee K, et al. MDGAs interact selectively with neuroligin-2 but not other neuroligins to regulate inhibitory synapse development. Proc Natl Acad Sci USA. 2013.
3. Bhatt DL, et al. General principles of recombinant protein expression and purification for biochemical assays. Nature Protocols. [General reference — specific citation requires verification].

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