Background: LANCL2 Protein Biology

LANCL2 (LanC-like protein 2) is a mammalian homolog of bacterial LanC enzymes, which are involved in lantibiotic biosynthesis. In humans, LANCL2 is a peripheral membrane protein that has been implicated in multiple biological processes, including energy sensing via AMP-activated protein kinase (AMPK) pathways, immune cell regulation, and metabolic homeostasis. LANCL2 is widely expressed across tissues, with notable expression in the brain and immune cells. Its roles in T-cell function, inflammatory response modulation, and potential involvement in type 2 diabetes and inflammatory bowel disease make it a compelling target for biomedical research. Recombinant Human LANCL2 protein provides a standardized tool for interrogating these biological functions in vitro.

Materials and Equipment

• Recombinant Human LANCL2 protein (SKU: rp369021)
• Sterile deionized water or recommended reconstitution buffer (e.g., PBS, pH 7.4, with carrier protein such as 0.1% BSA if required)
• Low-protein-binding microcentrifuge tubes (1.5 mL)
• Micropipettes and sterile tips
• Ice bucket or cooling block
• Microcentrifuge
• -20°C and -80°C freezers
• SDS-PAGE or Western blot apparatus (for quality verification)
• Spectrophotometer or BCA/Bradford assay kit (for protein quantification)

Step-by-Step Reconstitution and Storage Protocol

Step 1 – Thawing: Remove the vial from -80°C (or -20°C) storage and allow it to equilibrate on ice for 10–15 minutes. Do not thaw at room temperature or use a water bath above 37°C, as this may denature the protein.

Step 2 – Centrifugation: Briefly centrifuge the vial (1,000–2,000 × g, 30 seconds) to collect any material from the cap and walls of the tube before opening.

Step 3 – Reconstitution: If supplied as lyophilized powder, reconstitute with the volume of sterile water or recommended buffer specified in the product datasheet to achieve the desired stock concentration. Add buffer gently along the side of the tube to avoid foaming. Mix by gentle pipetting; do not vortex.

Step 4 – Equilibration: Allow the reconstituted protein to equilibrate at 4°C for 5–10 minutes with intermittent gentle mixing to ensure complete dissolution.

Step 5 – Aliquoting: Prepare single-use aliquots in low-protein-binding tubes to avoid repeated freeze-thaw cycles, which can compromise protein integrity and activity.

Step 6 – Storage: Store working aliquots at -20°C for short-term use (up to 1 month) or at -80°C for long-term storage. Avoid storing at 4°C for extended periods. Always keep on ice during experimental use.

Recommended Applications and Assay Guidelines

Recombinant Human LANCL2 protein is suitable for a variety of in vitro research applications:

• Biochemical binding assays: Use purified LANCL2 protein to study protein–protein interactions, particularly with AMPK subunits or other interacting partners involved in energy sensing pathways.
• Enzyme activity assays: Assess any intrinsic enzymatic activity under appropriate buffer conditions as described in peer-reviewed literature.
• Antibody validation (ELISA, Western blot, immunoprecipitation): Use as a positive control antigen to validate anti-LANCL2 antibodies across immunoassay platforms.
• Cell-free signaling studies: Incorporate into reconstituted signaling systems to evaluate LANCL2's role in immune cell activation or metabolic regulation.
• Drug screening: Use as a target protein in small-molecule or peptide interaction assays relevant to metabolic and inflammatory disease research.

Optimal working concentrations should be determined empirically for each experimental system. It is recommended to include appropriate positive and negative controls in all assays.

Quality Control and Troubleshooting

Quality Verification: Upon receipt, verify protein integrity by SDS-PAGE under reducing conditions. A single band at the expected molecular weight confirms purity. Quantify protein concentration using a BCA or Bradford assay and compare to the stated concentration on the Certificate of Analysis (CoA).

Common Issues and Solutions:

• Protein aggregation: If aggregation is observed, centrifuge at 10,000 × g for 5 minutes at 4°C and use only the supernatant. Consider adding a non-ionic detergent (e.g., 0.01% Tween-20) or a reducing agent (e.g., DTT) if compatible with downstream assays.
• Loss of activity: Ensure the protein has not undergone more than two freeze-thaw cycles. Check that reconstitution buffer pH and ionic strength are appropriate.
• Low signal in immunoassay: Confirm antibody compatibility with the tag or epitope on the recombinant construct. Refer to the product datasheet for tag information.
• Contamination: Use aseptic technique throughout. Check endotoxin levels if conducting cell-based assays (endotoxin can confound immune activation results).

For persistent issues, contact Aladdin Scientific technical support with your lot number and CoA details.