SARNP Mouse mAb: Selection, Use & Best-Practice Guidelines

SARNP Mouse mAb is a high-specificity monoclonal antibody raised in mouse against SARNP, formulated in PBS and designed to deliver consistent, reproducible performance across a range of standard immunoassay applications.

Product Name

SARNP Mouse mAb

SKU

Ab350702

Host Species

Mouse

Antibody Type

Monoclonal Antibody (mAb)

Formulation

PBS (Phosphate-Buffered Saline), no additional preservatives stated

Target Protein

SARNP (SAP domain-containing ribonucleoprotein)

Reference Code

absea#KC-8416

Overview of SARNP and Antibody Rationale

SARNP (SAP domain-containing ribonucleoprotein) is a nuclear protein involved in mRNA splicing, export, and RNA processing pathways. It is associated with the exon junction complex (EJC) and plays roles in ensuring accurate pre-mRNA processing and nuclear export of mature transcripts. Dysregulation of SARNP has been reported in the context of cellular stress responses and certain disease states, making it a relevant target for molecular and cell biology research.

SARNP Mouse mAb (Ab350702) is a monoclonal antibody raised in mouse, providing a single, well-defined epitope specificity. Monoclonal antibodies offer superior lot-to-lot consistency compared with polyclonal preparations, which is critical for reproducibility in long-term research programs. The PBS-only formulation ensures that no carrier proteins or azide preservatives interfere with downstream coupling or cell-based assays.

Storage, Handling, and Stability Guidelines

Storage temperature: Store SARNP Mouse mAb at –20 °C for long-term storage. Aliquot upon first thaw to avoid repeated freeze-thaw cycles, which can reduce antibody activity and cause aggregation.

Short-term storage: For working stocks in active use (within 1–2 weeks), the antibody may be stored at 2–8 °C. Do not store at room temperature for extended periods.

Freeze-thaw cycles: Limit freeze-thaw cycles to a maximum of five. Prepare single-use aliquots at the volume appropriate for each experiment to minimize waste and degradation.

PBS formulation considerations: Because the product is formulated in PBS without glycerol or other cryoprotectants, ensure aliquots are sealed tightly and protected from frost-free freezer cycling. Adding glycerol to a final concentration of 10–50% (v/v) is advisable if very long-term storage at –20 °C is required; however, confirm compatibility with downstream assays before modification.

Avoid: Repeated freeze-thaw, exposure to temperatures above 37 °C, and vigorous vortexing. Mix gently by pipetting or brief low-speed centrifugation.

Recommended Applications and Optimization Protocol

SARNP Mouse mAb is suitable for use in standard immunoassay formats. Because the source material specifies PBS-only formulation and references the absea catalog code KC-8416, users should consult the accompanying datasheet for confirmed application list and recommended dilutions. General best-practice recommendations for mouse monoclonal antibodies targeting nuclear proteins are provided below.

Western Blot (WB): Begin with a primary antibody dilution of 1:500–1:2000 in blocking buffer (5% non-fat dry milk or BSA in TBST). Incubate overnight at 4 °C with gentle rocking. Use an HRP-conjugated anti-mouse secondary antibody at the manufacturer's recommended dilution. Include positive control lysate from a cell line known to express SARNP.

Immunofluorescence (IF) / Immunocytochemistry (ICC): Fix cells with 4% paraformaldehyde for 15 minutes, permeabilize with 0.1–0.3% Triton X-100 for 10 minutes. Block with 5% normal serum for 1 hour at room temperature. Apply primary antibody at 1:100–1:500 overnight at 4 °C. Expected localization is nuclear, consistent with SARNP biology.

Immunoprecipitation (IP): Pre-clear lysate with protein A/G beads. Incubate 1–5 µg of antibody per 500 µg total protein for 2 hours at 4 °C. Capture with protein A/G beads. Wash stringently to reduce non-specific binding.

Titration: Always perform a titration experiment to determine the optimal working concentration for your specific cell or tissue type, as expression levels vary. Run appropriate isotype controls (mouse IgG) in parallel.

Troubleshooting Common Issues

No signal / weak signal: Verify that the target protein is expressed in your model system. Increase primary antibody concentration incrementally. Ensure antigen retrieval (for FFPE tissue: heat-induced epitope retrieval, e.g., citrate buffer pH 6.0) is performed correctly. Check secondary antibody and detection reagent expiry.

High background: Optimize blocking conditions (increase blocker concentration or blocking time). Increase wash stringency (add 0.1% Tween-20 to wash buffer; extend wash duration). Titrate primary antibody to lower concentration. Confirm that the secondary antibody does not cross-react with endogenous immunoglobulins in the sample.

Non-specific bands (WB): Increase antibody dilution. Perform overnight blocking at 4 °C. Ensure complete cell lysis and protein denaturation. Run a negative control (knockdown or knockout cell line) to confirm band specificity.

Aggregation of antibody stock: Centrifuge the thawed vial at 10,000 × g for 5 minutes at 4 °C before use to pellet any aggregates. Do not use aggregated preparations for quantitative assays.

Quality Control, Safety, and Regulatory Notes

Quality control: SARNP Mouse mAb (Ab350702) is a research-grade reagent. Each lot should be functionally verified by the end user in the specific application and species of interest prior to use in critical experiments. Aladdin Scientific recommends retaining lot-specific datasheets for traceability.

Research use only: This product is intended solely for in vitro research use. It is not approved or validated for diagnostic, therapeutic, or clinical use in humans or animals. Do not use in any procedure intended to influence health outcomes.

Biosafety: Handle according to Good Laboratory Practice (GLP) guidelines. The PBS formulation does not contain hazardous preservatives such as sodium azide at stated concentrations; however, standard laboratory safety precautions apply. Consult the Safety Data Sheet (SDS) before use.

Disposal: Dispose of antibody preparations and contaminated materials in accordance with local institutional and governmental regulations for biological waste.

Frequently asked questions

What is the recommended storage condition for SARNP Mouse mAb (Ab350702)?

Store the antibody at –20 °C for long-term use. Once thawed, aliquot into single-use volumes to prevent repeated freeze-thaw cycles. Working stocks may be kept at 2–8 °C for up to 1–2 weeks.

Which applications is SARNP Mouse mAb validated for?

The specific validated applications for Ab350702 should be confirmed on the lot-specific datasheet supplied with the product. Common applications for mouse monoclonal antibodies against nuclear proteins include Western blot, immunofluorescence, immunocytochemistry, and immunoprecipitation. Users are advised to optimize conditions empirically for each application.

Why is a PBS-only formulation important for downstream applications?

A PBS-only formulation contains no carrier proteins (such as BSA or gelatin) or azide preservatives that could interfere with enzyme-linked assays, antibody conjugation reactions, or cell-based functional studies. This makes Ab350702 more versatile for coupling, labeling, or use in live-cell applications where cytotoxic preservatives must be avoided.

How should I handle the antibody to avoid aggregation?

Avoid repeated freeze-thaw cycles and do not vortex the antibody vigorously. After thawing, centrifuge the vial at 10,000 × g for 5 minutes at 4 °C before use to remove any aggregates. Gently mix by pipetting. Store aliquots tightly sealed.

What controls should I include when using SARNP Mouse mAb?

Include a mouse IgG isotype control at the same concentration as the primary antibody to assess non-specific binding. Use a SARNP-positive cell line lysate or tissue as a positive control, and where possible include a SARNP knockdown or knockout sample as a negative control to confirm signal specificity.

References

1. Aladdin Scientific product datasheet: SARNP Mouse mAb, SKU Ab350702 (absea#KC-8416). Aladdin Scientific internal reference.
2. Tange TO, Nott A, Moore MJ. The ever-growing world of exon junction complexes. Curr Opin Cell Biol. 2004;16(3):279-284. [General reference on EJC and associated RNA-binding proteins including SARNP biology context — specific SARNP data not confirmed from source material.]

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