Overview of RNF14 and Its Biological Significance

RNF14 (Ring Finger Protein 14), also known as ARA54, is a member of the RING finger domain-containing E3 ubiquitin ligase family. E3 ubiquitin ligases play a central role in the ubiquitin-proteasome system (UPS) by facilitating the transfer of ubiquitin from E2 conjugating enzymes to specific substrate proteins, thereby tagging them for proteasomal degradation or altering their activity and interactions.

RNF14 has been reported to interact with androgen receptor (AR) signaling pathways and is implicated in transcriptional regulation. Research interest in RNF14 spans oncology, cell cycle regulation, and protein quality control. A validated, highly specific monoclonal antibody such as Ab351055 is therefore an essential reagent for investigating RNF14 expression levels, protein–protein interactions, and subcellular localization in these contexts.

Antibody Specifications and Formulation Guidance

Ab351055 is a mouse monoclonal antibody raised against RNF14. The antibody is supplied in PBS (phosphate-buffered saline) without additional carrier proteins or preservatives stated in the source material. Researchers should note the following handling recommendations for PBS-only formulated antibodies:

• Storage: Store at –20 °C for long-term storage. Avoid repeated freeze–thaw cycles. Aliquot upon first use to preserve antibody activity.
• Carrier protein: Because no BSA or glycerol stabilizer is indicated, consider adding 50% glycerol (final concentration) before long-term freezing to enhance stability, unless downstream applications are sensitive to glycerol.
• Concentration: Refer to the Certificate of Analysis (CoA) supplied with each lot for confirmed protein concentration and titer information.
• Sterility: Handle under aseptic conditions if the antibody is to be used in cell-based assays.

Always consult the product datasheet (absea #KC-46127) and the lot-specific CoA before use.

Recommended Application Protocols

While specific validated applications should be confirmed on the product datasheet, the following general protocols represent best practices for mouse monoclonal antibodies targeting intracellular E3 ubiquitin ligases such as RNF14:

Western Blot (WB)

1. Lyse cells or tissue in RIPA buffer supplemented with protease inhibitors. Centrifuge at 12,000 × g for 15 min at 4 °C.
2. Determine protein concentration (BCA or Bradford assay). Load 20–40 µg total protein per lane on SDS-PAGE.
3. Transfer to PVDF membrane. Block with 5% non-fat milk in TBST for 1 hour at room temperature.
4. Incubate with RNF14 Mouse mAb (Ab351055) at the manufacturer-recommended dilution (see CoA) overnight at 4 °C.
5. Wash 3× with TBST (10 min each). Incubate with HRP-conjugated anti-mouse secondary antibody for 1 hour at RT.
6. Detect by ECL chemiluminescence. Expected band size for RNF14: approximately 50–60 kDa (verify with CoA).

Immunoprecipitation (IP)

1. Pre-clear lysate with Protein G or Protein A beads. Add Ab351055 at recommended concentration and incubate overnight at 4 °C with rotation.
2. Add fresh beads and incubate for 2 hours. Wash beads 4× with lysis buffer. Elute with SDS sample buffer and analyze by WB.

Immunofluorescence (IF)

1. Fix cells with 4% paraformaldehyde for 15 min. Permeabilize with 0.1% Triton X-100 for 10 min.
2. Block with 5% normal goat serum for 1 hour. Incubate with primary antibody at recommended dilution overnight at 4 °C.
3. Wash and incubate with fluorophore-conjugated anti-mouse secondary antibody. Counterstain nuclei with DAPI. Image by confocal or fluorescence microscopy.

Troubleshooting Common Issues

The following troubleshooting table addresses common issues encountered when working with RNF14 Mouse mAb (Ab351055):