KIR3DL1 Mouse mAb: Selection, Application & Usage Guide

KIR3DL1 Mouse mAb is a monoclonal antibody raised in mouse against the human KIR3DL1 inhibitory NK-cell receptor, supplied in PBS and designed to support precise detection and functional characterization of KIR3DL1-expressing immune cells in research settings.

Product SKU

Ab351272

Antibody Format

Mouse Monoclonal Antibody (mAb)

Formulation Buffer

PBS (Phosphate-Buffered Saline) only

Target Antigen

KIR3DL1 (Killer Cell Immunoglobulin-like Receptor, Three Ig Domains and Long Cytoplasmic Tail 1)

Host Species

Mouse

Primary Research Area

NK cell biology, innate immunity, transplantation immunology

Target Overview: KIR3DL1 and Its Biological Role

KIR3DL1 (Killer Cell Immunoglobulin-like Receptor, Three Ig Domains and Long Cytoplasmic Tail 1) is an inhibitory receptor expressed predominantly on natural killer (NK) cells and a subset of T lymphocytes. It belongs to the KIR gene family encoded within the Leukocyte Receptor Complex (LRC) on human chromosome 19q13.4. KIR3DL1 recognizes HLA-B allotypes carrying the Bw4 serological epitope, and upon ligand engagement it transduces inhibitory signals through immunoreceptor tyrosine-based inhibitory motifs (ITIMs) in its long cytoplasmic tail, thereby suppressing NK-cell cytotoxicity and cytokine production.

KIR3DL1 is highly polymorphic; numerous allelic variants have been described that differ in surface expression level and binding affinity for HLA-Bw4 ligands. This polymorphism has clinical relevance in haematopoietic stem-cell transplantation, HIV disease progression, and cancer immunosurveillance research. Researchers studying NK-cell education (licensing), missing-self recognition, and KIR-ligand mismatch models commonly require reliable, validated antibodies to detect and quantify KIR3DL1 on primary cells and cell lines.

Product Specifications and Formulation Guidance

The Aladdin Scientific KIR3DL1 Mouse mAb (SKU: Ab351272) is formulated exclusively in PBS (Phosphate-Buffered Saline) without carrier proteins, preservatives, or stabilizers unless otherwise stated on the Certificate of Analysis (CoA). The PBS-only formulation offers several practical advantages: it is directly compatible with most downstream conjugation chemistries, avoids BSA interference in cell-based assays, and minimises background in sensitive detection systems.

Recommended storage: Store at 2–8 °C for short-term use (up to 1 month). For longer-term storage, aliquot and store at −20 °C or −80 °C to avoid repeated freeze-thaw cycles, which can reduce antibody activity. Avoid prolonged exposure to light if the antibody has been conjugated to a fluorophore.

Handling notes: Centrifuge the vial briefly before opening to collect contents at the bottom. For dilution, use PBS supplemented with 1% BSA or an equivalent blocking buffer appropriate for your assay. Do not dilute in azide-containing buffers if the antibody is intended for use in functional or cell-viability assays, as sodium azide is cytotoxic.

Recommended Applications and Protocol Guidance

While specific validated application data should be confirmed on the product CoA and datasheet, mouse monoclonal antibodies targeting KIR3DL1 are widely used in the following applications:

• Flow Cytometry (FC): Surface staining of peripheral blood mononuclear cells (PBMCs) or NK-cell lines to enumerate KIR3DL1-positive NK cell subsets. Typical working concentrations for flow cytometry range from 0.5–5 µg/mL; titration is recommended for each new lot.
• Immunofluorescence (IF): Detection of KIR3DL1 on fixed immune cells or tissue sections. Use standard aldehyde-based fixatives; antigen retrieval may be required for paraffin-embedded tissues.
• Immunoprecipitation (IP): Pull-down of KIR3DL1 protein complexes from cell lysates for downstream proteomic or co-IP studies.
• Western Blot (WB): Detection of denatured KIR3DL1 under reducing SDS-PAGE conditions. Note that mAbs raised against native epitopes may show reduced signal under denaturing conditions; confirm suitability on the datasheet.

Always include an appropriate isotype control (mouse IgG of the same subclass) to assess non-specific binding, particularly for flow cytometry and immunofluorescence applications.

Troubleshooting Common Issues

Researchers may encounter the following issues when working with KIR3DL1 Mouse mAb. The guidance below reflects general best practices for monoclonal antibodies in this format:

• High background / non-specific staining: Increase blocking stringency (use 5% normal serum from the secondary antibody host species or 1–3% BSA). Optimize antibody concentration by titration. Ensure adequate washing steps between incubation stages.
• Weak or absent signal: Verify that the target cells express KIR3DL1 (KIR3DL1 is not universally expressed on all NK cells; expression is allele- and individual-dependent). Check antibody lot viability—test with a positive control cell line known to express KIR3DL1 (e.g., YT cells or primary NK cells from a KIR3DL1-positive donor). Confirm the antibody has not undergone freeze-thaw degradation.
• Lot-to-lot variability: Always re-titrate with each new lot. Request lot-specific CoA data from Aladdin Scientific to compare binding activity.
• PBS-only formulation concerns: For long-term storage in PBS without carrier protein, aggregation can occur. Centrifuge at 10,000 × g for 5 minutes at 4 °C before use to remove aggregates.

Regulatory, Safety and Ordering Information

KIR3DL1 Mouse mAb (Ab351272) is supplied for research use only (RUO) and is not intended for diagnostic, therapeutic, or veterinary use. The reagent has not been evaluated by regulatory agencies for use in clinical procedures.

Safety: Handle in accordance with standard laboratory biosafety practices for research-grade biological reagents. Consult the Safety Data Sheet (SDS) provided by Aladdin Scientific before use. The PBS formulation does not contain hazardous preservatives such as sodium azide at concentrations that require special precautions, but users should verify the SDS for the specific lot received.

Ordering: To place an order or request a quote for Ab351272, contact Aladdin Scientific via the website or reach out to your regional sales representative. Bulk quantities, custom conjugations, or OEM packaging inquiries can be directed to the technical sales team. Ensure your purchase order references the SKU Ab351272 to avoid fulfilment errors.

Frequently asked questions

What is KIR3DL1 and why is it an important research target?

KIR3DL1 is an inhibitory NK-cell receptor that recognises HLA-Bw4 ligands and suppresses NK-cell cytotoxicity through ITIM-mediated signalling. It is highly polymorphic and clinically relevant in transplantation, HIV research, and cancer immunology, making it a key target for studies of NK-cell function and immune regulation.

Why is the KIR3DL1 Mouse mAb formulated in PBS only, and how should I store it?

The PBS-only formulation avoids interference from carrier proteins (e.g., BSA) in cell-based and conjugation assays, maximising compatibility with downstream applications. Store at 2–8 °C for short-term use or aliquot and freeze at −20 °C to −80 °C for long-term storage; avoid repeated freeze-thaw cycles to preserve antibody integrity.

Which cell types are appropriate positive controls for KIR3DL1 staining?

Primary NK cells isolated from peripheral blood of KIR3DL1-positive donors and NK-cell lines such as YT are commonly used as positive controls. Because KIR3DL1 expression is allele- and donor-dependent, genotyping the donor or cell line for KIR3DL1 status before use as a control is recommended.

Is Ab351272 suitable for Western blot applications?

Mouse monoclonal antibodies against KIR3DL1 may be used for Western blot under denaturing SDS-PAGE conditions, but sensitivity can be reduced if the antibody clone targets a conformational epitope. Users should confirm application suitability on the product datasheet or CoA and include appropriate positive control lysates.

How do I reduce non-specific background when using KIR3DL1 Mouse mAb in flow cytometry?

To reduce background, block samples with 5–10% normal serum from the secondary antibody host or an Fc-receptor blocking reagent prior to primary antibody incubation. Titrate the antibody to its optimal working concentration, use a matched isotype control, and ensure thorough washing steps between incubations.

References

1. Lanier LL. NK cell recognition. Annual Review of Immunology. 2005;23:225-274. doi:10.1146/annurev.immunol.23.021704.115526
2. Moretta A, et al. Activating receptors and coreceptors involved in human natural killer cell-mediated cytolysis. Annual Review of Immunology. 2001;19:197-223. doi:10.1146/annurev.immunol.19.1.197
3. Vilches C, Parham P. KIR: diverse, rapidly evolving receptors of innate and adaptive immunity. Annual Review of Immunology. 2002;20:217-251. doi:10.1146/annurev.immunol.20.092501.134942

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.