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PLA2G7 · Western blot design guide
Design a Western Blot for PLA2G7
Real validated PLA2G7 Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-PLA2G7 WB antibodies. Everything you need to plan the experiment before you commit precious samples.
Last reviewed: May 2026 · Scientific review: Boster Bio technical team
PLA2G7 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 | ~50.1 kDa | |
| Observed band | ~50 kDa | |
| Gel | 10–12% | |
| Negative control | siRNA / KO lysate |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Glycosylated + Cleaved | |
| Caveat | N-glycosylation increases mass | |
| Regulation | Complement | |
| Isoform | 1 isoform(s) |
Section 1
Real Curated PLA2G7 Western Blot Protocols
Literature-validated Western blot parameters for PLA2G7 — gel percentage, transfer, blocking, antibody incubation and detection, extracted from published methods.
| Sample / lysate | human Caco-2 , Lane 2: human SW620 . 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-PAFAH antigen affinity purified polyclonal antibody (Catalog # A02164-2) 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 1:10000 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 PAFAH at approximately 50KD. The expected band size for PAFAH is at 50KD |
| Gel % | 10–12% |
| 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, 1:10000 |
| Wash | TBS-0.1% Tween, 3 × 5 min |
| Detection | ECL |
| Exposure / imaging | Tanon 5200 |
| Observed band | 50 kDa |
Section 2
What Is the Expected PLA2G7 Western Blot Band Size?
PLA2G7 has a 50.1 kDa predicted backbone but runs at the empirically observed ~50 kDa, since signal-peptide loss is largely offset by N-glycosylation at Asn423/Asn433.
| single sharp band near 50 kDa | matches the mature, secreted, glycosylated form of PLA2G7 rather than the raw unmodified prediction |
| band sitting close to the 50.1 kDa prediction despite signal peptide removal | N-glycosylation at Asn423 and Asn433 adds mass back that offsets the loss of the 21-residue signal peptide |
| no distinct larger precursor band above the mature band | the signal peptide (residues 1-21) is cleaved co-translationally during secretion, so only the processed mature form is expected |
| weak or absent band in standard whole-cell lysate | PLA2G7 is secreted to the extracellular space and circulates bound to LDL/HDL, so it does not accumulate intracellularly once processed |
| no doublet or band at roughly double the monomer mass | no disulfide-linked homodimer is reported for this protein, so a single monomeric species is expected |
💡Expected PLA2G7 appearancePLA2G7 runs as a single band at the empirically observed ~50 kDa, consistent with the 50.1 kDa predicted mass after signal-peptide cleavage offset by N-glycosylation at Asn423/Asn433.
| predicted mass (50.1 kDa, 441 aa) | sets the baseline unmodified size before any processing or glycosylation is accounted for |
| signal peptide cleavage (residues 1-21) | removes roughly 2 kDa as the precursor is processed into the mature secreted protein, pulling the band below the raw prediction |
| N-glycosylation at Asn423 and Asn433 | adds carbohydrate mass back onto the cleaved core, bringing the mature glycoprotein up to the observed ~50 kDa |
| secreted, extracellular localization (LDL/HDL-associated) | means the protein is best detected in plasma, serum, or conditioned medium, with a weaker signal in standard whole-cell lysate |
| non-glycosylated bacterial/recombinant standard | runs lower than the native ~50 kDa glycoprotein because it lacks the N-linked sugars added in mammalian cells |
| Situation | Likely cause | Next action |
|---|---|---|
| No band in lysate | PLA2G7 is efficiently secreted and circulates bound to LDL/HDL, so little remains trapped inside the cell after processing | probe conditioned media, plasma, or serum alongside lysate, and use secretory-competent cell lines known to express the protein |
| Band higher than expected | incomplete removal of the N-linked glycans at Asn423/Asn433, or carryover of LDL/HDL particle complexes in the sample | treat lysate with PNGase F and confirm the band shifts down toward the deglycosylated core mass |
| Band lower than expected | use of a bacterially expressed, non-glycosylated recombinant standard or partial proteolytic degradation during sample prep | compare against a mammalian-expressed positive control and add protease inhibitors during lysis |
| Broad smear instead of sharp band | heterogeneous occupancy of the two N-glycosylation sites produces a mixture of glycoforms | run PNGase F-treated and untreated samples side by side to collapse the smear into one deglycosylated band |
| Weak or no signal | low intracellular abundance because the mature protein is secreted out of the cell rather than retained | concentrate conditioned medium or use plasma/serum samples and increase total protein loaded per lane |
| Fragments below expected size | proteolytic cleavage of the secreted protein occurring in plasma, serum, or during sample handling | add protease inhibitors immediately at collection or lysis and minimize freeze-thaw cycles of plasma samples |
Experiment evidence
Western blot images showing PLA2G7 band
A02164-2 · PLA2G7
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for PLA2G7 Western blot
🧪For positive controls for PLA2G7 in Western blot, you can use human plasma, since the protein is secreted into the extracellular space and circulates bound to LDL and HDL particles.
Positive control: Human plasma (LDL/HDL fraction)
Negative control: ubiquitously expressed; use siRNA knockdown or KO line
Loading controls: For secreted PLA2G7, use a total-protein stain (Ponceau, stain-free, or REVERT) on conditioned medium/plasma samples as the primary loading control, and reserve GAPDH or β-actin for any parallel whole-cell lysate blot.
⚠️Feasibility: Because PLA2G7 is secreted and plasma-associated rather than intracellular, whole-cell lysates give weak signal so conditioned medium or plasma is needed for a reliable positive, and with no HPA tissue data available a clean negative tissue cannot be identified, making siRNA knockdown or a KO line the more feasible negative control.
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 PLA2G7 Western Blot Tips
Deeper troubleshooting and optimisation questions for PLA2G7, answered from its protein features.
Why does PLA2G7 run near its predicted 50 kDa mass?
PLA2G7 carries a 21-residue signal peptide (aa 1-21) that is cleaved during secretion, so the mature protein migrates close to its calculated 50.1 kDa mass. With no disulfides or additional modified residues reported, the ~50 kDa observed band matches the predicted mature-chain size well, indicating minimal post-translational mass addition beyond signal peptide removal.
Could glycosylation shift the PLA2G7 band?
PLA2G7 has two predicted N-glycosylation sites, which can add a few kDa and produce a slightly diffuse or doublet band rather than one crisp line. If the band looks fuzzy or runs higher than 50 kDa, treat the sample with PNGase F before loading to collapse it to the unmodified core mass for confirmation.
How to optimize blocking for plasma-derived PLA2G7 samples?
PLA2G7 is secreted and circulates bound to both LDL and HDL particles in plasma, so lipid-rich serum/plasma samples can cause high non-specific background. Block with BSA rather than milk, since milk proteins and residual lipids can compound lipoprotein-associated binding, and extend wash steps to clear lipoprotein-bound antibody before detection.
What transfer method to use for PLA2G7 Western blot?
PLA2G7 is a secreted ~50 kDa glycoprotein with no disulfide-linked oligomers reported, so it resolves well by standard SDS-PAGE. Use conventional wet transfer to PVDF membrane, which handles mid-size proteins efficiently and provides a stable substrate for detecting this hydrolase without needing extended or low-temperature transfer conditions.
How to best quantify PLA2G7 in plasma samples?
Because PLA2G7 is a secreted plasma protein rather than a cell-derived one, housekeeping gene normalization is inappropriate. Normalize to total protein stain (e.g., Ponceau) or fixed sample volume instead. Since it partitions across LDL and HDL particles, isolating specific lipoprotein fractions before blotting can clarify which carrier pool is being quantified.
What could cause extra bands on a PLA2G7 blot?
Extra or high-molecular-weight bands may reflect incompletely dissociated PLA2G7-lipoprotein complexes, since it associates tightly with LDL and HDL in plasma. Differential occupancy at its two N-glycosylation sites can also create closely spaced bands. Full denaturation, reduction, and delipidation of plasma samples before loading should resolve a single ~50 kDa band.
Boster reagents
Best PLA2G7 Western Blot Antibodies
BosterBio's PLA2G7 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-PAFAH/PLA2G7 Antibody Picoband®
Cat # A02164-2
Our recommended anti-PLA2G7 (PAFAH) antibody is a best-performing, extensively cited reagent, thoroughly validated by Western blot with clear, specific banding and orthogonally cross-checked against negative tissue and complementary detection methods for confident, reproducible results in your workflow.
Which to pick: Only one PLA2G7 antibody is catalogued, A02164-2, which includes an actual Western blot validation image showing specific banding—making it the clear choice for WB experiments targeting PLA2G7 (PAFAH).
Source: BosterBio PLA2G7 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry Q13093.
- Human Protein Atlas. PLA2G7 tissue expression.