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PPP2R1A · Western blot design guide
Design a Western Blot for PPP2R1A
Real validated PPP2R1A Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-PPP2R1A WB antibodies. Everything you need to plan the experiment before you commit precious samples.
Last reviewed: May 2026 · Scientific review: Boster Bio technical team
PPP2R1A 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 | ~65.3 kDa | |
| Gel | 10–12% | |
| Negative control | siRNA / KO lysate |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Acetylated | |
| Caveat | Multi-subunit complex formation | |
| Regulation | IFN-γ-induced | |
| Isoform | 1 isoform(s) |
Section 1
Real Curated PPP2R1A Western Blot Protocols
Literature-validated Western blot parameters for PPP2R1A — gel percentage, transfer, blocking, antibody incubation and detection, extracted from published methods.
| Sample / lysate | human Hela , Lane 2: human HepG2 , Lane 3: human A431 , Lane 4: monkey COS-7 , Lane 5: rat kidney , Lane 6: rat C6 , Lane 7: mouse NIH/3T3 . 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-PPP2R1A antigen affinity purified polyclonal antibody (Catalog # A02822-2) 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 PPP2R1A at approximately 65 kDa. The expected band size for PPP2R1A is at 65 kDa |
| Gel % | 10–12% |
| Load | 30 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 | 65 kDa |
Section 2
What Is the Expected PPP2R1A Western Blot Band Size?
PPP2R1A is predicted at 65.3 kDa and typically runs as a single unmodified band near that size, lacking glycosylation, disulfide dimerization, or isoforms.
| Single band near 65 kDa | Represents full-length PPP2R1A at its predicted mass, since it carries no glycosylation, disulfide bonds, or cleaved propeptide |
| No mass shift despite acetylation marks | N-terminal N-acetylalanine and Lys280 N6-acetyllysine add negligible mass and do not produce a separate or shifted band |
| No additional isoform-sized bands | Only one annotated isoform exists, so extra bands from alternative splicing are not expected |
| Band present across cytoplasmic and nuclear/chromatin fractions | PPP2R1A localizes to cytoplasm, nucleus, chromosome/centromere, and lateral membrane, so it should be detectable in multiple subcellular fractions rather than absent from whole-cell lysate |
| No co-migrating higher-mass complex band under reducing SDS-PAGE | Although PPP2R1A assembles into the heterotrimeric PP2A holoenzyme with catalytic and regulatory subunits, denaturing/reducing conditions dissociate the complex so only the monomeric ~65 kDa subunit is seen |
💡Expected PPP2R1A appearanceExpect a single sharp band at approximately 65 kDa, matching the predicted mass of PPP2R1A, with no glycosylation-, disulfide-, or isoform-driven shifts.
| Predicted mass (65.3 kDa) | Sets the baseline expected migration position of monomeric PPP2R1A on SDS-PAGE |
| Absence of glycosylation | No sugar-driven mass addition or smearing above the predicted 65 kDa is expected |
| Absence of disulfide-linked homodimer | PPP2R1A runs as a monomer rather than showing a higher-mass dimer band even under non-reducing conditions |
| No signal peptide or propeptide cleavage | The full-length protein is already the mature form, so no smaller cleaved product is expected |
| Single annotated isoform | No additional isoform-derived bands at alternative molecular weights are expected |
| Heterotrimeric PP2A holoenzyme assembly | Under denaturing/reducing SDS-PAGE the complex dissociates, so co-migration with the catalytic or B subunit does not add mass to the PPP2R1A band |
| Situation | Likely cause | Next action |
|---|---|---|
| No band in lysate | The chromosome/centromere-associated pool of PPP2R1A requires nuclease or high-salt extraction that standard RIPA lysis may under-recover | Use a nuclear/chromatin extraction buffer or benzonase treatment to solubilize centromere-bound PPP2R1A before loading |
| Band higher than expected | PPP2R1A remains bound to its PP2A holoenzyme partners (catalytic C and regulatory B subunits) if denaturation is incomplete | Fully boil samples in SDS sample buffer with reducing agent to dissociate the holoenzyme complex before loading |
| Multiple bands | Antibody cross-reactivity with co-purifying PP2A subunits or partial proteolytic degradation during lysate preparation | Include protease inhibitors during lysis and confirm the ~65 kDa band with a knockdown or knockout control |
| Weak or no signal | Low extraction efficiency from the chromosome/centromere or lateral membrane pools where PPP2R1A also resides | Increase lysate loading or optimize lysis conditions to capture membrane- and chromatin-associated fractions |
| Fragments below expected size | Proteolytic degradation during sample handling can clip the 65 kDa subunit, since PPP2R1A has no natural propeptide cleavage to account for smaller species | Add fresh protease inhibitors, keep samples cold throughout processing, and minimize freeze-thaw cycles |
Experiment evidence
Western blot images showing PPP2R1A band
A02822-2 · PPP2R1A
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for PPP2R1A Western blot
🧪For positive controls for PPP2R1A in Western blot, you can use HeLa cell lysate, since PPP2R1A is a broadly expressed scaffold subunit found across virtually all human cell types.
Positive control: HeLa cells
Negative control: ubiquitously expressed; use siRNA knockdown or KO line
Loading controls: Run GAPDH and β-actin antibody blots alongside a total-protein stain (e.g., stain-free gel, Ponceau S, or REVERT) as loading controls.
⚠️Feasibility: Because PPP2R1A localizes broadly to the cytoplasm, nucleus, chromosomes, and lateral cell membrane and is ubiquitously expressed, no tissue serves as a clean negative control, so siRNA knockdown or a CRISPR knockout 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 PPP2R1A Western Blot Tips
Deeper troubleshooting and optimisation questions for PPP2R1A, answered from its protein features.
Why might PPP2R1A run near its 65 kDa predicted mass?
No signal peptide, no propeptide cleavage, and no glycosylation are annotated, and only two modified residues (acetylation) are listed, so the protein is not proteolytically processed or heavily modified. It should migrate close to the calculated 65.3 kDa, with only minor deviation expected from its elongated HEAT-repeat, armadillo-like solenoid fold rather than from missing mass or added modifications.
Should multiple isoform bands be expected on blots?
UniProt annotates only one isoform for PPP2R1A with no alternative sequences listed. A single band near 65 kDa is expected on a clean blot; any additional bands are more likely degradation products or nonspecific antibody binding than genuine splice-variant isoforms, since no isoform diversity is documented for this subunit.
Does acetylation alter PPP2R1A migration on SDS-PAGE?
Two modified residues are annotated as acetylation sites. Acetylation neutralizes lysine charge but adds negligible mass, so it is unlikely to shift apparent molecular weight on a standard gel. If acetylation status is functionally relevant, confirm with an acetyl-lysine-specific antibody rather than relying on a mobility shift.
What blocking buffer works best for PPP2R1A detection?
With no glycosylation and no disulfide bonds annotated, standard 5% non-fat milk in TBST is adequate and avoids concerns about lectin-glycoprotein interference from milk. Switch to BSA blocking only if the chosen primary antibody targets a phosphorylated or acetylated epitope, since milk components can otherwise interfere with those detections.
What transfer method to use for PPP2R1A Western blot?
At 65 kDa, standard wet or semi-dry transfer onto 0.45 um PVDF or nitrocellulose is sufficient. No extended transfer time is needed, since the protein is mid-range in size and no large resistant complex or high-molecular-weight aggregate is documented that would require modified transfer conditions.
How to quantify PPP2R1A across subcellular fractions?
PPP2R1A localizes to cytoplasm, nucleus, chromosome/centromere, and lateral cell membrane. Comparing pools across these compartments requires fraction-specific loading controls, such as a cytoplasmic marker and a chromatin marker, rather than one total-lysate normalizer, to avoid misattributing changes in relative distribution to changes in total abundance.
What could explain unexpected bands beyond the main 65 kDa band?
PP2A subunits dissociate under denaturing SDS-PAGE, so a band near 36 kDa likely reflects the separately migrating PPP2CA catalytic subunit in the lysate rather than antibody cross-reactivity. Fainter bands may arise from proteolytic clipping of the elongated HEAT-repeat scaffold or from disease-associated variant instability affecting protein integrity.
Boster reagents
Best PPP2R1A Western Blot Antibodies
BosterBio's PPP2R1A 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-PPP2R1A Antibody Picoband®
Cat # A02822-2
For PPP2R1A Western blotting, we recommend a best-performing, extensively cited antibody that has undergone thorough validation, including orthogonal cross-validation against negative tissue controls and complementary methods, ensuring specific, reproducible detection you can trust.
Which to pick: Only one Boster anti-PPP2R1A antibody is catalogued here, A02822-2, which includes an actual Western blot validation image, making it the clear, ready-to-use choice for your PPP2R1A WB experiments without needing to compare alternatives.
Source: BosterBio PPP2R1A gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry P30153.
- Human Protein Atlas. PPP2R1A tissue expression.