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NLRC4 · Western blot design guide
Design a Western Blot for NLRC4
Real validated NLRC4 Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-NLRC4 WB antibodies. Everything you need to plan the experiment before you commit precious samples.
Last reviewed: May 2026 · Scientific review: Boster Bio technical team
NLRC4 Western Blot Experimental Design Guide
Expected bands, validated protocols, controls and antibodies — the at-a-glance facts below, then the full design guide.
Must know before running
| Expected band | ~116.2 kDa | |
| Observed band | ~116 kDa | |
| Gel | 8–10% | |
| Negative control | siRNA / KO lysate |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Phosphorylated | |
| Caveat | Alternative splicing isoforms | |
| Regulation | IFN-γ-induced | |
| Isoform | 4 isoform(s) |
Section 1
Real Curated NLRC4 Western Blot Protocols
Literature-validated Western blot parameters for NLRC4 — gel percentage, transfer, blocking, antibody incubation and detection, extracted from published methods.
| Sample / lysate | 22RV1 , Lane 2: RH35 , Lane 3: NIH3T3 . After electrophoresis, proteins were transferred to a nitrocellulose membrane at 150 mA for 50-90 minutes. Blocked the membrane with 5% non-fat milk/TBS for 1.5 hour at RT. The membrane was incubated with rabbit anti-CARD12 antigen affinity purified polyclonal antibody (Catalog # PB9673) at 0.5 μg/mL overnight at 4°C, then washed with TBS-0.1%Tween 3 times with 5 minutes each and probed with a goat anti-rabbit IgG-HRP secondary antibody at a dilution of 1:5000 for 1.5 hour at RT. The signal is developed using an Enhanced Chemiluminescent detection (ECL) kit (Catalog # EK1002) with Tanon 5200 system. A specific band was detected for CARD12 at approximately 116 kDa. The expected band size for CARD12 is at 116 kDa |
| Gel % | 8–10% |
| Load | 40 ug |
| Transfer | nitrocellulose membrane, 150 mA, 50–90 min |
| Membrane | nitrocellulose |
| Blocking | 5% non-fat milk / TBS, 1.5 h RT |
| Primary antibody | 0.5 µg/mL |
| Primary incubation | overnight at 4 °C |
| Secondary antibody | goat anti-rabbit IgG-HRP, 1:5000 |
| Wash | TBS-0.1% Tween, 3 × 5 min |
| Detection | ECL |
| Exposure / imaging | Tanon 5200 |
| Observed band | 116 kDa |
Section 2
What Is the Expected NLRC4 Western Blot Band Size?
NLRC4 has a 116.2 kDa predicted monomer mass and runs at the same ~116 kDa on blots, since no glycosylation, disulfide dimerization, or cleavage alters its size.
| Single sharp band at ~116 kDa | matches the predicted 116.2 kDa monomer with no modification annotated to shift it, consistent with the empirical ~116 kDa band |
| Extra faint band slightly above or below the main ~116 kDa band | likely reflects one of the four annotated splice isoforms rather than a nonspecific product |
| No additional band near double the monomer mass | NLRC4 homooligomerizes to form the inflammasome, but with no inter-chain disulfide annotated the assembly is non-covalent and does not survive SDS-PAGE as a higher-MW species |
| Sharp band rather than a diffuse smear | consistent with the absence of any annotated glycosylation sites on NLRC4 |
| Slight band broadening or faint doublet around ~116 kDa | can reflect a mixed phosphorylated and unphosphorylated pool at the annotated Ser533 phosphosite |
💡Expected NLRC4 appearanceExpect a single sharp band at the empirical ~116 kDa on reducing SDS-PAGE, matching NLRC4's predicted 116.2 kDa monomer mass, since no glycosylation, disulfide dimerization, or cleavage is annotated to shift it.
| Predicted mass (116.2 kDa, 1024 aa) | sets the baseline expected monomer band, which matches the empirical ~116 kDa observed band |
| Homooligomerization into the NLRC4 inflammasome | occurs without an annotated inter-chain disulfide, so the assembly is non-covalent and dissociates under reducing SDS-PAGE, keeping the band at the ~116 kDa monomer rather than shifting it higher |
| Alternative splicing (isoforms 1-4) | can add extra bands near the canonical ~116 kDa band; without per-isoform masses, expect the canonical isoform as the dominant band and the others as minor variants of qualitatively different size |
| No signal peptide or propeptide | no proteolytic maturation cleavage occurs, so the full-length cytoplasmic protein runs intact rather than as a smaller processed product |
| Ser533 phosphorylation | can cause a small mobility shift or slight band broadening between phosphorylated and unphosphorylated pools |
| Situation | Likely cause | Next action |
|---|---|---|
| No band in lysate | NLRC4 expression is tied to its innate immunity/inflammasome role and is largely restricted to myeloid/immune lineage cells, so non-immune cell lines may lack detectable protein | include a myeloid/monocytic cell line lysate as a positive control and confirm equal loading with a housekeeping protein |
| Band higher than expected | NLRC4 homooligomerizes to assemble the inflammasome, and incompletely denatured oligomeric complexes can migrate as higher-molecular-weight species even without a covalent disulfide link | fully boil samples in fresh reducing SDS sample buffer to dissociate oligomers before loading |
| Multiple bands | four annotated splice isoforms of NLRC4 can be co-expressed, producing extra bands near the main ~116 kDa band | compare against a validated positive control lysate and use knockdown or an isoform-directed antibody to confirm which band is genuine |
| Broad smear instead of sharp band | heterogeneous phosphorylation at the annotated Ser533 site can generate a mixed population of slightly different mobilities | include phosphatase inhibitors during lysis for a consistent phosphorylation state, or run a phosphatase-treated sample in parallel to sharpen the band for comparison |
| Weak or no signal | NLRC4 is a low-abundance signaling protein whose levels and activity are tied to inflammasome activation state in immune cells | stimulate cells with an inflammasome-activating trigger, load more total protein, and extend primary antibody incubation |
Experiment evidence
Western blot images showing NLRC4 band
PB9673 · NLRC4
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for NLRC4 Western blot
🧪For positive controls for NLRC4 in Western blot, you can use THP-1 monocytic cells, since NLRC4 is a CARD-domain inflammasome component whose expression and activity are concentrated in monocyte/macrophage-lineage cells rather than reported in the Human Protein Atlas for this protein.
Positive control: THP-1 monocytic cells
Negative control: ubiquitously expressed; use siRNA knockdown or KO line
Loading controls: Run GAPDH and β-actin as loading controls alongside a total-protein stain (Ponceau S, stain-free gel, or REVERT) to confirm even loading and transfer.
⚠️Feasibility: No HPA expression data exists for NLRC4 and it is restricted to immune/inflammasome-competent cells rather than broadly expressed, so a clean tissue-based negative control cannot be identified and siRNA knockdown or a knockout cell line is needed to confirm antibody specificity.
Comprehensive Human Protein Atlas IHC scoring per tissue. Rows are taken directly from the HPA tissue chart — click any row's HPA link to view the source.
Positive expression · recommended positive controls
| Tissue | Cell type | Level | Evidence | Source |
|---|
Undetected expression · recommended negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|
Section 3
Advanced NLRC4 Western Blot Tips
Deeper troubleshooting and optimisation questions for NLRC4, answered from its protein features.
Does the observed band match the predicted NLRC4 mass?
Yes. Predicted mass is 116.2 kDa and the observed band runs at approximately 116 kDa, indicating no significant post-translational shift. This close agreement supports using a standard 6-8% resolving gel without needing to account for unexplained mobility shifts for the full-length protein.
Could isoforms produce extra NLRC4 bands?
UniProt lists 4 annotated isoforms for NLRC4. If your antibody epitope is shared across isoforms, additional bands below 116 kDa are possible and should not automatically be called nonspecific. Confirm which isoform(s) your immunogen targets before interpreting secondary bands as artifacts.
Is NLRC4 phosphorylation likely to affect its migration?
NLRC4 carries one annotated modified residue (phosphoprotein). Phosphorylation is typically too small a modification to cause a visible mobility shift on standard SDS-PAGE, but it can occur upon inflammasome activation. A single consistent band near 116 kDa is expected regardless of phosphorylation status.
What transfer method to use for NLRC4 Western blot?
At ~116 kDa, use wet transfer for higher efficiency of large proteins, extending transfer time (60-90 min at higher voltage or overnight at low voltage) and using lower methanol content buffer to preserve pore structure. Semi-dry transfer is possible but may require longer, gentler protocols to fully transfer this large protein.
How should NLRC4 blots be quantitated reliably?
Since NLRC4 is cytoplasmic and not secreted or glycosylated, normalize signal to a cytosolic loading control rather than membrane or nuclear markers. Use linear-range exposures and quantify the single ~116 kDa band, as isoform cross-reactivity could otherwise inflate apparent signal if bands are pooled.
Why might NLRC4 show a high molecular weight smear?
NLRC4 homooligomerizes to form the inflammasome complex upon activation. Incomplete denaturation or insufficient reducing/boiling conditions can leave oligomeric assemblies intact, producing high-molecular-weight smearing above 116 kDa. Ensure thorough sample boiling in reducing SDS sample buffer to resolve a clean monomeric band.
Do unexpected lower molecular weight bands indicate degradation?
Given NLRC4's large size (116.2 kDa) and multidomain architecture (NBD, LRR, CARD), proteolytic degradation during lysis is a common cause of lower-MW bands. Include protease inhibitors and keep samples cold throughout lysis to minimize fragmentation before attributing such bands to isoform-specific epitopes.
Boster reagents
Best NLRC4 Western Blot Antibodies
BosterBio's NLRC4 antibodies are among the best-performing WB antibodies on the market — well cited, thoroughly validated, and orthogonally cross-validated against negative tissues and complementary methods.
Real WB data
Anti-CARD12/NLRC4 Antibody Picoband®
Cat # PB9673
The anti-NLRC4 antibody below is a best-performing, well-cited reagent, thoroughly validated in western blot and orthogonally cross-checked against negative-tissue controls and complementary detection methods, giving confident, reproducible results for detecting endogenous NLRC4 protein across sample types.
Which to pick: Only one anti-NLRC4 antibody is catalogued, PB9673, which includes an actual western blot validation image (as anti-CARD12, NLRC4's alias), so it's the clear pick for WB experiments requiring visually confirmed specificity.
Source: BosterBio NLRC4 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry Q9NPP4.
- Human Protein Atlas. NLRC4 tissue expression.