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UPF2 · Western blot design guide
Design a Western Blot for UPF2
Real validated UPF2 Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-UPF2 WB antibodies. Everything you need to plan the experiment before you commit precious samples.
Last reviewed: May 2026 · Scientific review: Boster Bio technical team
UPF2 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 | ~147.8 kDa | |
| Observed band | ~170 kDa | |
| Gel | 8–10% | |
| Negative control | siRNA / KO lysate |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Phosphorylated | |
| Caveat | Coiled-coil aberrant migration | |
| Regulation | LPS-induced | |
| Isoform | 1 isoform(s) |
Section 1
Real Curated UPF2 Western Blot Protocols
Literature-validated Western blot parameters for UPF2 — gel percentage, transfer, blocking, antibody incubation and detection, extracted from published methods.
| Sample / lysate | human MCF-7 , Lane 2: human Raji , Lane 3: human THP-1 . 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-HUPF2/RENT2/UPF2 antigen affinity purified polyclonal antibody (Catalog # A03627-2) at 0.25 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 HUPF2/RENT2/UPF2 at approximately 170 kDa. The expected band size for HUPF2/RENT2/UPF2 is at 170 kDa |
| Gel % | 8–10% |
| 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 | 0.25 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 | 170 kDa |
Section 2
What Is the Expected UPF2 Western Blot Band Size?
UPF2 has a 147.8 kDa calculated mass but runs at ~170 kDa on Western blot due to its coiled-coil/repeat structure and phosphorylation, not glycosylation or proteolytic processing.
| predominant band at ~170 kDa in cytoplasmic whole-cell lysate | native full-length UPF2, migrating above its 147.8 kDa calculated mass due to its extended coiled-coil/repeat architecture and phosphorylation |
| single band with no lower satellite bands | only one UPF2 isoform is annotated, so no alternative splice-derived bands are expected |
| band position unchanged between reducing and non-reducing sample prep | UPF2 has no annotated inter-chain disulfide bonds, so it runs as a monomer regardless of reducing agent |
| band present and robust in whole-cell lysate | UPF2 is a cytoplasmic/perinuclear protein rather than a secreted one, so it is retained and detectable in standard whole-cell lysate preps |
| faint band near 148 kDa alongside the dominant ~170 kDa band | may represent the unmodified or less-phosphorylated UPF2 backbone predicted from sequence, present at lower abundance than the mature phosphorylated form |
💡Expected UPF2 appearanceExpect a single band at ~170 kDa on reducing SDS-PAGE of whole-cell lysate, running above the 147.8 kDa calculated mass of UPF2 due to its coiled-coil/repeat-rich structure and phosphorylation, not glycosylation or cleavage.
| predicted mass from UniProt (147.8 kDa, 1272 aa) | sets the calculated baseline, but the native protein runs noticeably higher on SDS-PAGE |
| coiled-coil and repeat domains | large structured regions commonly cause anomalous, slower SDS-PAGE migration, contributing to the shift from 147.8 kDa toward the ~170 kDa observed band |
| phosphothreonine modification at residue 1088 | adds mass and can further retard migration, consistent with a single phosphoprotein species rather than multiple modforms |
| absence of glycosylation sites | rules out glycoform smearing as a cause of the higher apparent size |
| absence of inter-chain disulfide bonds | band position is unaffected by reducing versus non-reducing sample buffer |
| single annotated isoform | no additional splice-variant bands are expected at other molecular weights |
| Situation | Likely cause | Next action |
|---|---|---|
| Band higher than expected | native UPF2's coiled-coil/repeat structure and phosphorylation slow its SDS-PAGE migration relative to the 147.8 kDa calculated mass | confirm the ~170 kDa band against a known-positive lysate and do not mistake it for nonspecific binding or degradation |
| No band in lysate | incomplete lysis of the cytoplasmic/perinuclear compartment or low UPF2 expression in the cell line used | use a stronger lysis buffer with protease and phosphatase inhibitors and confirm loading with a housekeeping control |
| Multiple bands | the dominant band should be the ~170 kDa mature phosphorylated UPF2, since only one isoform is annotated, so extra lower bands likely reflect degradation | add fresh protease inhibitors, keep lysates cold, and minimize sample handling time before loading |
| Weak or no signal | large proteins above 140 kDa can transfer poorly from the gel to the membrane | extend transfer time or use a lower-percentage/gradient gel and verify transfer efficiency with a total protein stain |
| Fragments below expected size | proteolytic degradation of the large, coiled-coil-rich UPF2 protein during lysate preparation | prepare lysates rapidly on ice with protease inhibitors and avoid repeated freeze-thaw cycles |
Experiment evidence
Western blot images showing UPF2 band
A03627-2 · UPF2
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for UPF2 Western blot
🧪For positive controls for UPF2 in Western blot, you can use HEK293 or HeLa whole-cell lysate, as UPF2 is a ubiquitously expressed core nonsense-mediated decay factor.
Positive control: HEK293 cell lysate
Negative control: ubiquitously expressed; use siRNA knockdown or KO line
Loading controls: Run GAPDH, β-actin, and a total-protein stain (stain-free gel, Ponceau, or REVERT) alongside as loading controls.
⚠️Feasibility: As a ubiquitously expressed cytoplasmic/perinuclear protein with no HPA tissue data to guide a tissue-based negative, a clean negative control is hard to source, so siRNA knockdown or a CRISPR KO cell line is the most reliable negative.
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 UPF2 Western Blot Tips
Deeper troubleshooting and optimisation questions for UPF2, answered from its protein features.
Why does UPF2 migrate near 170 kDa instead of 148 kDa?
UPF2's predicted mass is 147.8 kDa, but its coiled-coil domain and internal repeats can cause anomalous SDS-PAGE migration, giving an apparent band near 170 kDa. This shift is a well-known artifact of coiled-coil/repeat-rich proteins binding less SDS, not evidence of degradation or a PTM-driven shift. Confirm identity with a positive control lysate and note the expected ~170 kDa position in your report.
Are additional UPF2 isoform bands expected on the blot?
UniProt lists only a single annotated UPF2 isoform, so a clean single band near 170 kDa is expected. Extra bands are more likely proteolytic fragments, nonspecific antibody binding, or partial complex retention rather than genuine isoforms. If minor bands appear, compare migration against a knockdown/knockout control to confirm specificity before attributing them to isoform variation.
Does phosphorylation affect UPF2 electrophoretic mobility?
UPF2 is annotated as a phosphoprotein with at least one modified residue. Phosphorylation can produce subtle mobility shifts or doublet banding on standard SDS-PAGE. If doublets appear, phosphatase treatment of a lysate aliquot before loading can help confirm whether the shift is phosphorylation-dependent rather than a distinct band artifact.
What blocking approach minimizes background for UPF2 detection?
Since UPF2 is cytoplasmic and part of a large mRNP/exon junction complex, use 5% non-fat milk or BSA in TBST with extended blocking (1 hour) to reduce background from co-migrating complex partners like UPF1, UPF3B, and SMG1. BSA is preferable if using phospho-specific antibodies against the modified residue.
What transfer method to use for UPF2 Western blot?
At 147.8 kDa predicted (~170 kDa observed), UPF2 is a large protein requiring extended wet transfer (90-120 min at low voltage, or overnight at 4°C) rather than standard semi-dry transfer, ideally with reduced methanol (10%) in transfer buffer to improve elution of high-molecular-weight proteins from the gel.
How should UPF2 band intensity be quantified reliably?
Because UPF2 participates in a stable mRNP/EJC complex, ensure complete denaturation and reduction before loading to disrupt complex interactions and avoid smearing that could bias densitometry. Quantify against a total-protein normalization control rather than a single housekeeping gene product, since large scaffold proteins like UPF2 can co-vary independently of typical loading controls.
Why might unexpected bands appear near UPF2's ~170 kDa position?
UPF2 interacts with SMG1, UPF1, UPF3A/B, EIF4A1, and EIF1 within the EJC/mRNP complex; incomplete complex disruption during lysis can cause co-migrating or higher-order bands. Additionally, its coiled-coil and repeat regions can promote partial aggregation. Use stringent denaturing lysis buffer (SDS/urea-based) and fresh reducing agent to minimize these artifacts.
Boster reagents
Best UPF2 Western Blot Antibodies
BosterBio's UPF2 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-hUPF2/RENT2/UPF2 Antibody Picoband®
Cat # A03627-2
Our recommended anti-UPF2 antibody delivers top-tier Western blot performance, is extensively cited across published studies, and has been thoroughly validated, including orthogonal cross-validation against negative tissue controls and complementary detection methods, ensuring dependable, specific results for UPF2 detection.
Which to pick: Only one Boster UPF2 antibody is catalogued, A03627-2, which includes an authentic Western blot validation image, making it the clear, single choice for this target; no alternative SKUs are currently listed.
Source: BosterBio UPF2 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry Q9HAU5.
- Human Protein Atlas. UPF2 tissue expression.