Background: HTN3 Protein Biology

Histatin-3 (HTN3) is a member of the histatin family of small, histidine-rich cationic peptides secreted predominantly by the parotid and submandibular salivary glands in humans. HTN3 is encoded by the HTN3 gene and is closely related to Histatin-1, sharing structural homology within the histatin peptide family. The protein plays a central role in oral innate immunity through its potent antimicrobial and antifungal activities.

HTN3 exhibits particularly strong activity against Candida albicans, the primary fungal pathogen responsible for oral candidiasis, making it a subject of significant interest in infectious disease and mycology research. In addition to its antifungal properties, HTN3 has been implicated in wound-healing processes, as salivary histatins have been shown to promote epithelial cell migration and re-epithelialization. Research into HTN3 mechanisms may inform the development of novel antimicrobial therapeutics and wound-care agents.

Product Specifications and Quality Attributes

Recombinant Human HTN3 Protein (SKU: rp369901) supplied by Aladdin Scientific is produced using recombinant expression systems to ensure batch-to-batch consistency and research-grade quality. Researchers should consult the accompanying Certificate of Analysis (CoA) for lot-specific data, including purity assessment, endotoxin levels, and biological activity confirmation.

Key quality considerations for recombinant HTN3 include:

• Purity: Research-grade recombinant proteins are typically assessed by SDS-PAGE or HPLC; refer to the CoA for lot-specific purity values.
• Endotoxin: Low endotoxin levels are critical for cell-based and in vivo assays; verify endotoxin specification on the CoA before use in sensitive biological systems.
• Formulation: The protein may be supplied lyophilized or in liquid buffer; refer to the product datasheet for formulation details specific to rp369901.

Note: Specific numerical values for purity, molecular weight, and endotoxin are not reproduced here; always consult the current product datasheet and CoA available from Aladdin Scientific.

Reconstitution and Handling Protocol

Proper reconstitution and handling of Recombinant Human HTN3 Protein are essential to preserve biological activity and ensure reproducible experimental results. Follow the guidelines below as a general framework, and always refer to the product-specific datasheet for rp369901.

1. Equilibration: Allow the vial to equilibrate to room temperature for 10–15 minutes before opening to minimize condensation-related contamination.
2. Reconstitution (if lyophilized): Reconstitute the lyophilized protein in the buffer recommended on the product datasheet. Use sterile, nuclease-free water or the specified reconstitution buffer. Add reconstitution buffer slowly along the side of the vial and gently swirl; do not vortex vigorously, as this may cause protein denaturation.
3. Concentration: Calculate the final protein concentration based on the volume added and the stated amount per vial. Confirm concentration by absorbance at 280 nm (A280) using the protein's extinction coefficient if available, or via a standard protein assay (e.g., BCA or Bradford).
4. Aliquoting: Prepare single-use aliquots to avoid repeated freeze-thaw cycles, which can degrade protein integrity and reduce activity.
5. Storage: Store aliquots at -20°C for short-term use or -80°C for long-term storage. Avoid storing at 4°C for extended periods.

Specific buffer composition and reconstitution volumes are provided on the rp369901 product datasheet. Contact Aladdin Scientific technical support for guidance if needed.

Research Applications

Recombinant Human HTN3 Protein is suitable for a range of in vitro and biochemical research applications. Researchers are advised to optimize conditions empirically for each specific assay. Validated and suggested applications include:

• Antifungal activity assays: HTN3 is well-characterized for its activity against Candida species. Minimum inhibitory concentration (MIC) assays and fungicidal killing assays can be conducted using recombinant HTN3 against relevant fungal strains.
• Antimicrobial studies: Evaluation of HTN3 antibacterial properties against oral and non-oral pathogens using broth microdilution or disk diffusion methods.
• Cell migration and wound-healing assays: HTN3 has been studied for its ability to promote epithelial cell migration; scratch assays and transwell migration assays are relevant in vitro models.
• Binding and interaction studies: Surface plasmon resonance (SPR), co-immunoprecipitation, or pull-down assays to characterize HTN3 interactions with target molecules or receptors.
• Structural and biophysical characterization: Circular dichroism (CD) spectroscopy and NMR studies to investigate HTN3 secondary structure under various conditions.
• ELISA and immunoassay development: As a reference standard or positive control antigen in sandwich or competitive ELISA formats.

Safety, Disposal, and Regulatory Compliance

Recombinant Human HTN3 Protein is intended for research use only (RUO) and is not approved for diagnostic, therapeutic, or any clinical use in humans or animals. Users must comply with all applicable institutional, local, and national biosafety regulations when handling recombinant proteins of human origin.

General safety precautions:

• Handle using standard laboratory biosafety practices; wear appropriate personal protective equipment (PPE) including gloves, lab coat, and eye protection.
• Treat all materials of human origin with appropriate caution in accordance with institutional biosafety guidelines.
• Dispose of protein solutions, used consumables, and packaging in accordance with institutional waste disposal protocols and applicable environmental regulations.

Regulatory note: This product is supplied as a research reagent. It has not undergone the regulatory review required for clinical or in vitro diagnostic use. Researchers are responsible for ensuring compliance with all relevant regulations in their jurisdiction.