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TRPA1 · Western blot design guide
Design a Western Blot for TRPA1
Real validated TRPA1 Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-TRPA1 WB antibodies. Everything you need to plan the experiment before you commit precious samples.
Last reviewed: May 2026 · Scientific review: Boster Bio technical team
TRPA1 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 | ~127.5 kDa | |
| Observed band | ~120 kDa | |
| Gel | 8–10% | |
| Negative control | siRNA / KO lysate |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Glycosylated | |
| Caveat | Multi-pass membrane protein | |
| Regulation | LPS-suppressed | |
| Isoform | 1 isoform(s) |
Section 1
Real Curated TRPA1 Western Blot Protocols
Literature-validated Western blot parameters for TRPA1 — gel percentage, transfer, blocking, antibody incubation and detection, extracted from published methods.
| Sample / lysate | human HEPG2 , Lane 2: human CACO-2 . After Electrophoresis, proteins were transferred to a Nitrocellulose membrane at 150mA 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-TRPA1/TSA antigen affinity purified polyclonal antibody (Catalog # A00453-2) 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 TRPA1/TSA at approximately 120KD. The expected band size for TRPA1/TSA is at 120KD |
| Gel % | 8–10% |
| Load | 50ug |
| 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 | 120 kDa |
Section 2
What Is the Expected TRPA1 Western Blot Band Size?
TRPA1 has a 127.5 kDa calculated mass but is empirically observed at ~120 kDa, likely from anomalous membrane-protein migration outweighing its N-glycosylation.
| predominant band at ~120 kDa | the empirically confirmed native TRPA1 band, running just below its 127.5 kDa calculated mass |
| band appears broad or slightly diffuse rather than a crisp single line | heterogeneous N-glycosylation at Asn747 and Asn753 adds variable carbohydrate mass across the population of molecules |
| little or no signal in cytosolic-only fractions or non-detergent lysates | TRPA1 is a multi-pass plasma-membrane protein and needs membrane-solubilizing lysis conditions to be released |
| single species with no companion higher- or lower-mass bands | only one TRPA1 isoform is annotated, so no alternative-splicing bands are expected |
| band position essentially unchanged between reducing and non-reducing gels | the five annotated disulfide bonds are intrachain, stabilizing the pore-loop region rather than linking separate subunits |
💡Expected TRPA1 appearanceExpect a single band at approximately 120 kDa for TRPA1, slightly below its 127.5 kDa calculated mass, consistent with typical migration of this glycosylated multi-pass membrane channel.
| predicted backbone mass (127.5 kDa) | sets the baseline unmodified size against which the observed ~120 kDa band is compared |
| N-glycosylation at Asn747 and Asn753 | adds variable carbohydrate mass and can broaden the band into a diffuse smear rather than a sharp uniform shift |
| multi-pass membrane topology | hydrophobic transmembrane segments retain partial structure in SDS-PAGE and commonly cause faster migration (lower apparent kDa) than the calculated mass, matching the ~120 kDa observed band |
| intrachain disulfide bonds stabilizing the pore-loop region | preserved under non-reducing conditions but do not crosslink separate subunits, so band position stays essentially the same with or without reducing agent |
| non-glycosylated bacterial recombinant standard | runs lower than the native ~120 kDa band because it lacks the N-linked glycans present on the endogenous protein |
| Situation | Likely cause | Next action |
|---|---|---|
| No band in lysate | sample was extracted without a membrane-solubilizing detergent, leaving this multi-pass membrane channel unreleased | re-lyse in a buffer with 1% Triton X-100 or NP-40 and use whole-cell rather than cytosolic-only fractions |
| Band lower than expected | anomalous SDS-PAGE migration of the hydrophobic transmembrane domains pulls the band below the 127.5 kDa calculated mass | compare against the confirmed ~120 kDa reference band rather than the calculated mass, and run a known-positive lysate alongside |
| Broad smear instead of sharp band | heterogeneous N-glycosylation at Asn747 and Asn753 produces a range of glycoform masses | use a longer gradient gel run or treat a lysate aliquot with PNGase F to collapse the smear to a single deglycosylated species |
| Band higher than expected | incomplete denaturation or aggregation of the hydrophobic membrane protein leaves residual higher-order structure | increase SDS/reducing agent concentration and incubate at 37-55°C instead of full boiling to avoid membrane-protein aggregation |
| Multiple bands | nonspecific antibody cross-reactivity or partial proteolytic degradation during lysis | add protease inhibitors during lysis, confirm identity with a second antibody, and compare against a TRPA1 knockdown control |
| Weak or no signal | native TRPA1 expression is low outside sensory neuron populations | use dorsal root ganglia lysate or an overexpression system as a positive control and increase total protein loaded |
Experiment evidence
Western blot images showing TRPA1 band
A00453-2 · TRPA1
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for TRPA1 Western blot
🧪For positive controls for TRPA1 in Western blot, you can use HEK293 cells transiently transfected with a TRPA1 expression construct, since no Human Protein Atlas tissue or cell line expression data are available for this target.
Positive control: TRPA1-transfected HEK293 cells
Negative control: no HPA data available; use TRPA1 siRNA knockdown or CRISPR knockout line
Loading controls: Run GAPDH and β-actin alongside TRPA1, plus a total-protein stain (stain-free gel, Ponceau S, or REVERT) to confirm even loading and transfer of this multi-pass membrane protein.
⚠️Feasibility: As a low-abundance, multi-pass membrane ion channel with no HPA expression profiling to guide tissue selection, TRPA1 lacks a confirmed endogenous positive tissue, so overexpression systems and siRNA/KO-validated antibodies are needed for reliable controls.
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 TRPA1 Western Blot Tips
Deeper troubleshooting and optimisation questions for TRPA1, answered from its protein features.
Why does TRPA1 run at ~120 kDa instead of 127.5 kDa?
TRPA1 is a multi-pass membrane protein with ANK repeats and coiled-coil domains; such proteins often migrate faster than predicted on SDS-PAGE due to incomplete SDS binding and retained secondary structure. A ~120 kDa apparent band against a 127.5 kDa predicted mass is a normal, minor shift and does not indicate degradation or a truncated isoform.
Does TRPA1 have multiple isoforms to consider?
UniProt lists only one TRPA1 isoform, so a single specific band near 120-127 kDa is expected. Additional bands are more likely explained by partial degradation, incomplete reduction of the 5 disulfide bonds, or residual oligomeric species than by alternative splicing.
How do TRPA1 post-translational modifications affect its band?
TRPA1 carries 2 N-glycosylation sites and 3 modified residues, including hydroxylation (consistent with EGLN1 interaction) and cysteine oxidation. Glycosylation can broaden or slightly shift the band, while oxidation of reactive cysteines regulates channel gating rather than adding mass, so it should not change apparent molecular weight.
What blocking strategy suits TRPA1 membrane protein blots?
Because TRPA1 is a glycoprotein, block with 5% BSA rather than milk to avoid lectin-like glycoprotein interactions that raise background. Block for 1 hour at room temperature, and use BSA-based antibody diluent for both primary and secondary incubations to keep signal specific on this large multi-pass membrane protein.
What transfer method to use for TRPA1 Western blot?
TRPA1 is a large (127.5 kDa), multi-pass membrane protein, so wet tank transfer is preferred over semi-dry. Use a low-methanol (10%) transfer buffer, extend transfer time (60-90 min or overnight at low voltage/4C), and consider 0.1% SDS in the transfer buffer to help elute this hydrophobic protein from the gel.
How to accurately quantify TRPA1 by Western blot?
TRPA1 assembles as a homotetramer stabilized partly by its 5 disulfide bonds; reduce samples with DTT or beta-mercaptoethanol and heat fully to dissociate tetramers into monomers before loading. This ensures consistent monomeric band quantitation and avoids variable signal from partially reduced oligomeric species across lanes.
What causes unexpected high molecular weight TRPA1 bands?
Bands above ~120-127 kDa likely reflect incomplete reduction of TRPA1's 5 disulfide bonds or residual homotetramer/oligomer that resisted denaturation. Increasing reducing agent concentration, boiling time, and SDS in the sample buffer typically resolves these into the expected monomeric band.
Boster reagents
Best TRPA1 Western Blot Antibodies
BosterBio's TRPA1 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-TRPA1/TSA Antibody Picoband®
Cat # A00453-2
The recommended anti-TRPA1 antibody below represents Boster's best-performing option for Western blot, extensively cited in the literature and thoroughly validated, with specificity confirmed through orthogonal approaches including negative-tissue controls and complementary detection methods to ensure confident, reproducible TRPA1 detection.
Which to pick: Only one Boster anti-TRPA1/TSA antibody (A00453-2) is catalogued here, and it includes an actual Western blot validation image on 5-20% SDS-PAGE, making it the clear, and only, choice for TRPA1 WB detection.
Source: BosterBio TRPA1 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry O75762.
- Human Protein Atlas. TRPA1 tissue expression.