What Is CD16 and Why Is It Important?

CD16, also known as FcγRIII (Fc gamma receptor III, encoded by the FCGR3A and FCGR3B genes), is a low-affinity receptor for the Fc region of immunoglobulin G (IgG). It exists in two isoforms: CD16a (FcγRIIIa), expressed on natural killer (NK) cells, macrophages, and monocytes, and CD16b (FcγRIIIb), expressed primarily on neutrophils.

CD16a plays a central role in antibody-dependent cellular cytotoxicity (ADCC), a critical immune effector mechanism by which NK cells recognize and destroy antibody-coated target cells. Because of this, CD16 is a major focus of research into cancer immunotherapy, monoclonal antibody drug development, and innate immune regulation.

Recombinant Human CD16 Protein enables controlled in vitro studies of these interactions without the variability introduced by primary cell isolations.

Common Research Applications of Recombinant Human CD16 Protein

Recombinant Human CD16 Protein is used across a broad range of immunological and biopharmaceutical research contexts:

• ADCC Reporter and Binding Assays: CD16 protein is used as a capture or detection reagent to evaluate whether therapeutic antibodies (e.g., anti-tumor mAbs) can effectively engage CD16a, a prerequisite for ADCC activity.
• Antibody Screening and Engineering: Fc-engineered antibodies with enhanced CD16 affinity are evaluated using binding assays incorporating recombinant CD16.
• NK Cell Biology: Recombinant CD16 supports studies of NK cell activation thresholds, receptor clustering, and signaling pathway investigations in cell-free formats.
• ELISA and SPR: The protein is used as a coating antigen or analyte in enzyme-linked immunosorbent assays (ELISA) and surface plasmon resonance (SPR) experiments to measure IgG-Fc/CD16 binding kinetics.
• Drug Development QC: Biopharmaceutical developers use recombinant CD16 to assess lot-to-lot consistency of Fc-containing biologics with respect to Fc receptor binding.

Storage, Handling, and Reconstitution Guidelines

Proper storage and handling of Recombinant Human CD16 Protein are essential to maintain protein integrity and biological activity. The following general guidelines apply; always refer to the specific product datasheet (SKU: rp143817) for authoritative conditions:

• Storage Temperature: Lyophilized proteins are typically stored at −20 °C or −80 °C. Avoid repeated freeze-thaw cycles, which can cause aggregation and activity loss.
• Reconstitution: Reconstitute lyophilized protein in sterile, deionized water or the buffer specified in the datasheet to the recommended stock concentration. Allow the vial to equilibrate to room temperature before opening.
• Working Aliquots: Prepare single-use aliquots upon reconstitution to minimize freeze-thaw degradation.
• Carrier Protein: If long-term stability of dilute solutions is required, consider adding a carrier protein (e.g., 0.1% BSA) as specified in the datasheet.
• Sterility: For cell-based assays, use aseptic technique throughout reconstitution and handling.

Note: Specific buffer composition, concentration, and storage conditions are defined on the product datasheet. Please consult the datasheet for rp143817 before use.

Quality, Purity, and Validation

Aladdin Scientific's Recombinant Human CD16 Protein (rp143817) is manufactured under controlled conditions to ensure batch-to-batch reproducibility. Key quality attributes typically assessed for recombinant proteins of this type include:

• Purity: Assessed by SDS-PAGE and/or HPLC. Typical purity targets for research-grade recombinant proteins are ≥90% or ≥95%; the specific value for rp143817 is stated on the product datasheet.
• Identity: Confirmed by western blot or mass spectrometry.
• Biological Activity: Functional validation may be performed using binding assays with IgG-Fc or known CD16-binding ligands; refer to the datasheet for the specific activity assay used.
• Endotoxin Level: Endotoxin content is tested (typically by LAL assay); low endotoxin specifications are especially important for cell-based assays.

Researchers should request the Certificate of Analysis (CoA) for their specific lot to confirm all quality parameters before use.