Background: LANCL2 Biology and Research Relevance

LANCL2 (LanC-like protein 2), also known as GRP69A, is a member of the eukaryotic LanC-like protein family that shares structural homology with bacterial LanC enzymes involved in lantibiotic biosynthesis. In mammals, LANCL2 functions as a peripheral membrane protein and has been implicated in G-protein-coupled signaling, immune modulation, and metabolic regulation. Research has identified LANCL2 as a receptor for abscisic acid (ABA) and as a mediator of downstream cAMP and AMPK signaling pathways, positioning it as a compelling therapeutic target in inflammatory and metabolic diseases.

Recombinant Human LANCL2 Protein enables in vitro characterization of these pathways, supporting ligand-binding assays, protein–protein interaction studies, and structure–function analyses. Its availability as a purified recombinant reagent accelerates target validation and drug-discovery workflows.

Materials and Equipment

• Recombinant Human LANCL2 Protein (Aladdin Scientific, SKU: rp369020)
• Sterile, nuclease-free water or manufacturer-recommended reconstitution buffer
• Microcentrifuge tubes (1.5 mL, low-binding recommended)
• Micropipettes and calibrated tips
• Refrigerated microcentrifuge
• Dry ice or liquid nitrogen for snap-freezing aliquots
• −80 °C ultra-low temperature freezer
• Protein quantification reagents (e.g., BCA or Bradford assay kit)
• SDS-PAGE gel and Western blot apparatus (for quality verification, optional)

Step-by-Step Protocol: Reconstitution and Handling

Step 1 – Equilibration: Remove the vial of Recombinant Human LANCL2 Protein from −80 °C storage and allow it to equilibrate briefly on ice (5–10 minutes). Do not thaw at room temperature to minimize protein degradation.

Step 2 – Reconstitution: Centrifuge the vial briefly (1,000 × g, 30 seconds) to collect lyophilized material at the bottom. Add the recommended volume of sterile reconstitution buffer or nuclease-free water slowly along the inner wall of the vial. Gently swirl; do not vortex. Allow the protein to dissolve for 5–10 minutes on ice.

Step 3 – Protein Quantification: Determine the actual protein concentration using a BCA or Bradford assay. Compare with the stated nominal concentration on the Certificate of Analysis (CoA).

Step 4 – Aliquoting: Divide the reconstituted protein into single-use aliquots in low-binding microcentrifuge tubes to avoid repeated freeze-thaw cycles. Snap-freeze aliquots in liquid nitrogen or dry ice.

Step 5 – Storage: Store aliquots at −80 °C. For short-term use (up to 1 week), aliquots may be kept at 4 °C. Do not refreeze thawed aliquots.

Step 6 – Downstream Application: Dilute to working concentrations in the appropriate assay buffer immediately prior to use. Follow validated assay-specific conditions for binding studies, ELISA, or biochemical activity assays.

Quality Control and Troubleshooting

Purity Verification: Run an SDS-PAGE gel with Coomassie staining or perform Western blot using an anti-LANCL2 antibody to confirm protein identity and purity before critical experiments.

Activity Check: Where applicable, verify protein activity using a validated functional assay (e.g., GTP-binding assay or downstream AMPK phosphorylation assay) as described in the relevant literature.

Common Issues and Solutions:

• Precipitation upon reconstitution: Centrifuge at 10,000 × g for 5 minutes at 4 °C to remove aggregates before use. Consider adding carrier protein (e.g., 0.1% BSA) to the reconstitution buffer.
• Low apparent concentration: Ensure complete dissolution by extending incubation on ice and check pipetting technique. Confirm BCA/Bradford assay compatibility with the buffer components.
• Reduced biological activity: Minimize freeze-thaw cycles; use freshly prepared aliquots. Verify that assay buffer pH and ionic strength are within the recommended range.

Experimental Applications and Downstream Use Cases

Recombinant Human LANCL2 Protein (rp369020) is suited for a range of in vitro research applications:

• Ligand-binding assays: Characterize the interaction of LANCL2 with small molecules such as abscisic acid (ABA) or novel drug candidates using surface plasmon resonance (SPR), isothermal titration calorimetry (ITC), or fluorescence polarization assays.
• Protein–protein interaction studies: Use the recombinant protein as bait in pull-down or co-immunoprecipitation experiments to identify LANCL2 interacting partners involved in cAMP or AMPK signaling.
• ELISA and antibody validation: Serve as a positive control antigen for sandwich or competitive ELISAs and for validating anti-LANCL2 antibodies.
• Structural biology: Use as starting material for crystallography or cryo-EM studies aimed at resolving the LANCL2 binding pocket for structure-based drug design.
• Drug discovery: Support high-throughput screening (HTS) campaigns targeting LANCL2 for inflammatory bowel disease, type 2 diabetes, or related metabolic disorders.