PREPL Mouse mAb Protocol: Applications & Usage Guide

PREPL Mouse mAb is a high-specificity monoclonal antibody raised in mouse, designed to detect endogenous PREPL protein across a range of immunological applications including Western blot, immunohistochemistry, and immunofluorescence.

Product SKU

Ab350650

Clone Source

Mouse monoclonal antibody

Formulation

PBS only (no carrier protein, no azide)

Target Protein

PREPL (Prolyl Endopeptidase-Like protein)

Supplier Reference

absea#KC-31417

Recommended Storage

Store at -20°C; avoid repeated freeze-thaw cycles

Overview of PREPL and Antibody Specifications

PREPL (Prolyl Endopeptidase-Like) is a serine protease family member located in the mitochondrial matrix and cytoplasm. It has been implicated in neurotransmitter release regulation, metabolic processes, and is associated with hypotonia-cystinuria syndrome when the gene is deleted. Understanding PREPL expression and localization requires reliable detection reagents.

PREPL Mouse mAb (Ab350650) is a mouse-derived monoclonal antibody produced against the human PREPL antigen using the absea platform (reference: KC-31417). The antibody is formulated in PBS only, making it compatible with downstream conjugation, biotinylation, or direct use in standard immunoassay buffers. The PBS-only formulation also ensures minimal interference with assay systems sensitive to carrier proteins such as BSA or preservatives such as sodium azide.

Sample and Reagent Preparation

Cell and Tissue Lysate Preparation: Lyse cells or homogenize tissue in RIPA buffer supplemented with protease inhibitor cocktail. Centrifuge at 12,000 × g for 15 minutes at 4°C. Collect the supernatant and determine protein concentration by BCA or Bradford assay. Normalize samples to equal protein loading (typically 20–50 µg per lane for Western blot).

Antibody Reconstitution and Dilution: PREPL Mouse mAb (Ab350650) is supplied in PBS and is ready to use after gentle mixing. Prepare working dilutions in an appropriate diluent such as 1× TBS with 0.1% Tween-20 (TBST) supplemented with 5% non-fat dry milk or 3% BSA depending on the application. Optimal dilutions should be determined empirically by the end user; refer to the product datasheet for recommended starting ranges.

Blocking: Block membranes or tissue sections with 5% non-fat dry milk in TBST (for WB) or 3–5% normal serum from the secondary antibody host species (for IHC/IF) for 60 minutes at room temperature.

Immunoassay Protocol Steps

Western Blot (WB):

1. Separate normalized protein samples by SDS-PAGE and transfer to PVDF or nitrocellulose membrane.
2. Block membrane for 60 minutes at room temperature.
3. Incubate with PREPL Mouse mAb at the recommended dilution overnight at 4°C with gentle agitation.
4. Wash membrane 3× for 10 minutes each with TBST.
5. Incubate with appropriate HRP-conjugated anti-mouse secondary antibody for 60 minutes at room temperature.
6. Wash 3× with TBST and detect signal using ECL substrate. Image with a chemiluminescence imager or X-ray film.

Immunohistochemistry (IHC):

1. Deparaffinize FFPE sections and perform antigen retrieval (citrate buffer pH 6.0 or EDTA buffer pH 9.0 recommended).
2. Block endogenous peroxidase with 3% H₂O₂ for 10 minutes.
3. Block with normal serum and incubate with PREPL Mouse mAb at optimal dilution, overnight at 4°C.
4. Apply biotinylated anti-mouse secondary antibody, then ABC reagent, followed by DAB substrate development.
5. Counterstain with hematoxylin, dehydrate, and mount.

Immunofluorescence (IF):

1. Fix cells with 4% paraformaldehyde for 15 minutes, permeabilize with 0.1–0.3% Triton X-100 for 5 minutes.
2. Block and incubate with PREPL Mouse mAb at appropriate dilution.
3. Apply fluorophore-conjugated anti-mouse secondary antibody. Counterstain nuclei with DAPI if desired.
4. Mount coverslips and image by fluorescence microscopy.

Storage, Handling, and Troubleshooting

Storage Conditions: Store PREPL Mouse mAb (Ab350650) at -20°C upon receipt. For short-term use within one month, the antibody may be stored at 4°C. Avoid repeated freeze-thaw cycles, as this can reduce antibody activity. Aliquoting is recommended for long-term storage.

Handling Notes: Because the antibody is formulated in PBS only (no preservative), maintain sterile working conditions to prevent microbial contamination. Do not use products that are past their expiration date or show visible particulates.

Common Troubleshooting Points:

• No signal: Verify antigen retrieval conditions; confirm secondary antibody is compatible with mouse primary antibodies; check that protein transfer was successful.
• High background: Increase wash stringency; optimize blocking reagent; reduce primary or secondary antibody concentration.
• Non-specific bands: Use positive and negative controls; confirm correct gel percentage for expected PREPL molecular weight.
• Weak signal in IF: Extend primary antibody incubation time; increase fluorophore-conjugated secondary antibody concentration; check for photobleaching.

Quality Control and Experimental Controls

To ensure reliable and reproducible results with PREPL Mouse mAb, include the following controls in every experiment:

• Positive control: Use a cell line or tissue known to express PREPL (e.g., relevant human tissue lysate). Confirm expected band size by reference to published PREPL molecular weight data.
• Negative control: Omit the primary antibody and replace with isotype-matched mouse IgG at the same concentration to assess non-specific binding of the secondary antibody and detection system.
• Loading control (WB): Probe the membrane with a housekeeping protein antibody (e.g., β-actin or GAPDH) to confirm equal loading across lanes.
• No-primary control (IHC/IF): Process parallel sections or cells without primary antibody to distinguish specific staining from background.

Record lot numbers and antibody dilutions for each experiment. Aladdin Scientific recommends validating antibody performance in your specific cell or tissue system prior to committing to large-scale studies.

Frequently asked questions

What buffer is PREPL Mouse mAb (Ab350650) formulated in?

PREPL Mouse mAb is formulated in PBS only, with no carrier proteins or preservatives such as sodium azide. This makes it directly compatible with conjugation workflows and sensitive detection systems.

How should I store PREPL Mouse mAb to maintain optimal activity?

Store the antibody at -20°C for long-term storage. For short-term use within one month, 4°C storage is acceptable. Repeated freeze-thaw cycles should be avoided; aliquoting the antibody upon receipt is strongly recommended.

Which applications is PREPL Mouse mAb validated for?

Based on the product classification and standard protocols for mouse monoclonal antibodies, PREPL Mouse mAb is generally applicable to Western blot (WB), immunohistochemistry (IHC), and immunofluorescence (IF). Users should verify performance in their specific experimental system and consult the product datasheet for confirmed applications and recommended dilutions.

What controls should I include when using PREPL Mouse mAb?

Always include a positive control (PREPL-expressing cell or tissue lysate), a negative control (isotype-matched mouse IgG at the same concentration), and for WB, a housekeeping protein loading control. For IHC and IF, a no-primary-antibody control is also essential to identify non-specific background staining.

Can PREPL Mouse mAb be used with azide-sensitive detection systems?

Yes. Because PREPL Mouse mAb (Ab350650) is formulated in PBS only without sodium azide, it is compatible with azide-sensitive detection systems, including HRP-based assays and cell-based functional assays where azide would inhibit enzyme activity.

References

1. Product datasheet: PREPL Mouse mAb, Ab350650, absea reference KC-31417. Aladdin Scientific.
2. Jaeken J, et al. Deletion of PREPL and related genes causes hypotonia-cystinuria syndrome. General reference — specific citation details require verification.
3. Tomlinson PR, et al. PREPL: a putative novel prolyl endopeptidase-like enzyme. General reference — specific details require verification.

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