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POT1 · Western blot design guide
Design a Western Blot for POT1
Real validated POT1 Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-POT1 WB antibodies. Everything you need to plan the experiment before you commit precious samples.
Last reviewed: May 2026 · Scientific review: Boster Bio technical team
POT1 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 | ~71.4 kDa | |
| Observed band | ~71 kDa | |
| Gel | 10–12% | |
| Negative control | siRNA / KO lysate |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | — | |
| Caveat | Alternative splicing isoforms | |
| Regulation | IFN-γ-induced | |
| Isoform | 2 isoform(s) |
Section 1
Real Curated POT1 Western Blot Protocols
Literature-validated Western blot parameters for POT1 — gel percentage, transfer, blocking, antibody incubation and detection, extracted from published methods.
| Sample / lysate | human Hela , Lane 2: human K562 , Lane 3: rat brain , Lane 4: rat liver , Lane 5: mouse Neuro-2a . 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-POT1 antigen affinity purified polyclonal antibody (Catalog # PB9780) 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 POT1 at approximately 71KD. The expected band size for POT1 is at 71KD |
| 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 | 71 kDa |
Section 2
What Is the Expected POT1 Western Blot Band Size?
POT1 has a 71.4 kDa predicted mass and runs at the same ~71 kDa observed band, consistent with an unmodified monomer despite its native, non-covalent homodimer/shelterin partnering.
| Single band at ~71 kDa | Matches the predicted full-length POT1 mass; no glycosylation or proteolytic cleavage to shift the apparent size |
| Band present in nuclear/chromatin-enriched lysate but faint in cytoplasmic-only prep | POT1 is a nuclear, telomere-chromatin-associated protein rather than a secreted one, so it concentrates in nuclear/whole-cell lysates |
| Faint second band at a different apparent mass | Two annotated splice isoforms (isoform 1 and isoform 2) exist, so a minor secondary species distinct from the canonical band is possible |
| No shift in band position after non-reducing versus reducing sample prep | POT1 homodimerizes/oligomerizes through protein-protein contacts within the shelterin complex, not inter-chain disulfide bonds, so SDS denaturation dissociates it back to monomer regardless of reducing agent |
| No mass shift after PNGase F or deglycosylation treatment | POT1 has no annotated N- or O-glycosylation sites, so enzymatic deglycosylation is not expected to change its migration |
💡Expected POT1 appearanceExpect a single sharp band at approximately 71 kDa, matching the empirically observed band and the predicted mass of unmodified, full-length monomeric POT1.
| Predicted mass (71.4 kDa, 634 aa) | Sets the baseline monomer band size, consistent with the observed ~71 kDa band |
| Absence of glycosylation sites | No smearing or upward mass shift from glycan attachment; band should run sharp at the predicted size |
| No signal peptide or propeptide | No precursor-to-mature cleavage step, so no smaller processed fragment is expected, only the full-length band |
| Homodimer/homooligomer formation (non-covalent, no disulfide bonds) | Standard reducing, SDS-denaturing conditions dissociate the oligomer to monomer; a higher apparent-mass species appears only if the complex is incompletely denatured or run natively |
| Two annotated splice isoforms (isoform 1, isoform 2) | Isoform 2 may contribute an additional band at a different apparent mass than the canonical isoform, though no isoform-specific size is defined |
| Situation | Likely cause | Next action |
|---|---|---|
| Band higher than expected | Incomplete denaturation preserves POT1's homodimer/homooligomer or shelterin-complex interactions | Boil samples longer in fresh SDS/reducing sample buffer and avoid native run conditions |
| Multiple bands | Two annotated splice isoforms or partial degradation of this large nuclear protein | Confirm target identity against the antibody's immunogen region and include fresh protease inhibitors during lysis |
| Weak or no signal | POT1 is a lower-abundance, telomere-chromatin-associated nuclear protein | Enrich the nuclear/chromatin fraction, load more total protein, and use a sensitive ECL substrate |
| No band in lysate | Standard cytoplasmic-only lysis may not efficiently solubilize chromatin-bound nuclear POT1 | Use a nuclear extraction protocol with sonication or benzonase rather than a cytoplasmic-only buffer |
| Broad smear instead of sharp band | With no glycosylation sites annotated, a smear more likely reflects degradation or aggregation than glycoform heterogeneity | Keep samples cold, add fresh protease inhibitors, and avoid repeated freeze-thaw cycles |
| Fragments below expected size | Proteolytic degradation of this large nuclear protein during extraction | Minimize processing time and use a fresh protease inhibitor cocktail during lysis |
Experiment evidence
Western blot images showing POT1 band
PB9780 · POT1
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for POT1 Western blot
🧪For positive controls for POT1 in Western blot, you can use a proliferating cell line lysate such as HeLa cells, which reliably express POT1 due to their high telomerase and telomere-maintenance activity.
Positive control: HeLa cells
Negative control: ubiquitously expressed; use siRNA knockdown or KO line
Loading controls: Run GAPDH and β-actin alongside a total-protein stain (e.g., stain-free gel, Ponceau S, or REVERT) as loading controls.
⚠️Feasibility: No HPA tissue expression data is available for POT1, and as a low-abundance nuclear/telomeric protein present broadly in proliferating cells, there is no clean negative tissue, so antibody specificity is best confirmed with siRNA knockdown or a CRISPR KO cell line.
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 POT1 Western Blot Tips
Deeper troubleshooting and optimisation questions for POT1, answered from its protein features.
Why does the POT1 band match its predicted mass?
POT1 has no signal peptide, propeptide, glycosylation, or disulfide bonds reported, so it undergoes no major post-translational mass change. Its 71.4 kDa predicted mass therefore closely tracks the observed ~71 kDa band, making this a reliable, low-variability marker for confirming antibody specificity and correct transfer.
How do POT1's two isoforms appear on blots?
UniProt lists two POT1 isoforms (1 and 2) generated by alternative splicing. Isoform 2 may run as an additional band distinct from the ~71 kDa full-length isoform 1. Confirm which isoform your antibody epitope targets, and interpret extra bands near but not at 71 kDa as isoform-related rather than degradation.
Why might POT1 blots show a higher-molecular-weight band?
POT1 forms homodimers or homooligomers and is a core subunit of the shelterin complex with TERF1, TERF2, TINF2, TERF2IP, and ACD. Incomplete denaturation can leave dimeric or complexed POT1 species unresolved. Ensure thorough reduction and heating in SDS sample buffer to collapse these into the monomeric ~71 kDa band.
What blocking buffer works best for POT1 detection?
POT1 is a comparatively low-abundance nuclear DNA-binding protein, so use 5% BSA rather than milk to avoid milk phosphoprotein interference with antibody binding. Extend blocking and primary incubation times to compensate for limited POT1 yield in standard whole-cell or nuclear extracts.
What transfer method to use for POT1 Western blot?
At ~71 kDa, POT1 transfers efficiently by standard wet or semi-dry transfer with 20% methanol buffer. Wet transfer for 60-90 minutes is preferred, since nuclear extraction can leave residual chromatin or DNA that slows protein migration in faster semi-dry systems.
How should POT1 signal be normalized for quantitation?
Because POT1 localizes to the nucleus and telomeres, normalize to a nuclear loading control such as Lamin B1 or Histone H3 rather than a cytoplasmic marker like GAPDH. Confirm your extraction protocol adequately solubilizes chromatin-bound POT1 to avoid underestimating total protein levels.
Boster reagents
Best POT1 Western Blot Antibodies
BosterBio's POT1 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-POT1 Antibody Picoband®
Cat # PB9780
The anti-POT1 antibodies below represent our top-performing, most cited Western blot reagents, rigorously validated through orthogonal approaches including negative-tissue controls and complementary detection methods. Each has been thoroughly characterized to ensure specific, reproducible detection of POT1 across sample types.
Which to pick: Only one Boster POT1 antibody is catalogued, PB9780, which includes an actual Western blot validation image showing the expected band—making it the clear default choice for POT1 detection until additional clones are validated.
Source: BosterBio POT1 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry Q9NUX5.
- Human Protein Atlas. POT1 tissue expression.