Overview of LCTL and Its Biological Significance

LCTL (Lactase-like, also known as Lactase-Phlorizin Hydrolase-like) is a member of the glycosyl hydrolase family that shares structural homology with chitinases and lactase-phlorizin hydrolase. At the molecular level, LCTL is believed to participate in the hydrolysis of specific glycosidic bonds, placing it within the broader context of lysosomal carbohydrate-processing enzymes.

Research into chitinase-like proteins, including LCTL, has gained attention due to their potential roles in inflammatory signaling, innate immunity, and metabolic regulation. Understanding the biochemical properties of LCTL contributes to investigations of diseases where glycosidase dysfunction or dysregulation is implicated, such as lysosomal storage disorders and inflammatory conditions.

Recombinant Human LCTL Protein (rp368855) provides researchers with a defined, human-sequence source of this protein, enabling controlled in vitro studies of its enzymatic properties and molecular interactions.

Product Specifications and Quality Considerations

When working with Recombinant Human LCTL Protein (SKU: rp368855), researchers should consult the product-specific Certificate of Analysis (CoA) and datasheet for confirmed specifications, including:

• Expression System: The specific host expression system (e.g., E. coli, HEK293, Sf9 insect cells) determines post-translational modification status and should be considered when designing assays requiring glycosylated or non-glycosylated protein.
• Purity: Typical recombinant proteins intended for research use are supplied at ≥90% purity as assessed by SDS-PAGE or HPLC; confirm the exact purity grade from the CoA.
• Formulation: The protein is generally supplied in a stabilizing buffer; refer to the CoA for buffer composition, protein concentration, and presence of carrier proteins such as BSA.
• Molecular Weight: The theoretical molecular weight of LCTL should be confirmed against the CoA, as tags (e.g., His-tag, GST-tag) alter the observed molecular weight.

All specifications listed here are general guidance for recombinant proteins. Researchers must verify all critical parameters from official product documentation prior to experimental use.

Handling, Reconstitution, and Storage Guidelines

Proper handling of Recombinant Human LCTL Protein is essential to preserve biological activity and experimental reproducibility. The following guidelines represent best practices for recombinant proteins:

Reconstitution

• If supplied lyophilized, briefly centrifuge the vial before opening to collect material at the bottom.
• Reconstitute in the buffer recommended by the datasheet (typically sterile PBS or the supplier-specified buffer) to achieve the suggested working concentration.
• Allow the protein to dissolve gently; do not vortex vigorously, as mechanical shearing can denature the protein.

Storage

• Store working aliquots at -20°C to -80°C as specified in the CoA.
• Prepare single-use aliquots to minimize freeze-thaw cycles, which can reduce activity and promote aggregation.
• Addition of a carrier protein (e.g., 0.1% BSA) may stabilize dilute protein solutions during storage, if not already present in the formulation.

Handling on the Bench

• Work on ice and minimize the time the protein remains at room temperature.
• Use low-binding tubes and pipette tips to reduce protein loss due to surface adsorption.

Always refer to the Aladdin Scientific product datasheet and CoA for product-specific instructions that supersede general guidance.

Research Applications of Recombinant Human LCTL Protein

Recombinant Human LCTL Protein is suitable for a range of in vitro research applications. Researchers should validate the protein for their specific application and experimental conditions. Typical applications for recombinant proteins of this class include:

• Enzymatic Activity Assays: Characterizing the glycosidase or chitinase-like activity of LCTL using fluorogenic or colorimetric substrates, enabling kinetic parameter determination (Km, Vmax).
• Protein–Protein Interaction Studies: Using LCTL as bait or prey in co-immunoprecipitation, pull-down assays, or surface plasmon resonance (SPR) experiments to identify binding partners.
• Antibody Development and Validation: Serving as a positive control antigen for ELISA, Western blot, or immunoassay development targeting LCTL.
• Structural Biology: Supporting crystallography or cryo-EM studies to elucidate the three-dimensional structure of LCTL and its catalytic mechanism.
• Cell-Based Assays: Investigating the effects of exogenous LCTL on cellular responses, lysosomal function, or inflammatory signaling pathways in relevant cell lines.

Researchers are encouraged to optimize protein concentrations and assay conditions empirically. Consult the Aladdin Scientific technical team for application-specific support.

Quality Control and Verification Before Use

Before incorporating Recombinant Human LCTL Protein into critical experiments, implementing a quality control (QC) workflow is strongly recommended:

1. SDS-PAGE / Western Blot Verification: Run a small aliquot on SDS-PAGE under reducing and non-reducing conditions to confirm the expected molecular weight band. Use an anti-LCTL antibody or anti-tag antibody for Western blot confirmation of identity.
2. Protein Concentration Determination: Measure protein concentration using a validated assay (e.g., BCA, Bradford, or A280 absorbance with the protein-specific extinction coefficient) rather than relying solely on the supplied nominal concentration.
3. Activity Testing (if applicable): Where an enzymatic activity readout exists, perform a functional activity test to confirm the protein is active prior to use in downstream experiments.
4. Sterility and Endotoxin: For cell-based assays, confirm endotoxin levels are within acceptable limits (typically <1 EU/μg protein). Refer to the CoA for tested endotoxin levels.
5. Aliquot and Log: Record the date of reconstitution, lot number, concentration measured, and storage location for full traceability.

Implementing these steps minimizes experimental variability and ensures data integrity across studies.