This website uses cookies to ensure you get the best experience on our website.
- Table of Contents
NUP98 · Western blot design guide
Design a Western Blot for NUP98
Real validated NUP98 Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-NUP98 WB antibodies. Everything you need to plan the experiment before you commit precious samples.
Last reviewed: May 2026 · Scientific review: Boster Bio technical team
NUP98 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 | ~197.6 kDa | |
| Gel | 4–12% gradient | |
| Negative control | siRNA / KO lysate |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Phosphorylated + Acetylated | |
| Caveat | Autocatalytic cleavage | |
| Regulation | G2m checkpoint | |
| Isoform | 6 isoform(s) |
Section 1
Real Curated NUP98 Western Blot Protocols
Literature-validated Western blot parameters for NUP98 — gel percentage, transfer, blocking, antibody incubation and detection, extracted from published methods.
| Sample / lysate | human Caco-2 , Lane 2: human Hela , Lane 3: human K562 , Lane 4: monkey COS-7 , Lane 5: rat NRK , Lane 6: rat PC-12 , Lane 7: mouse RAW264.7 , Lane 8: 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-NUP98 antigen affinity purified polyclonal antibody (Catalog # A01301-1) 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 NUP98 at approximately 98,105 kDa. The expected band size for NUP98 is at 198 kDa |
| Gel % | 4–12% gradient |
| 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 | 98, 105 kDa |
Section 2
What Is the Expected NUP98 Western Blot Band Size?
NUP98 is made as a 197.6 kDa precursor that autoproteolytically cleaves into ~98 kDa Nup98 and ~96 kDa Nup96 fragments, with six isoforms adding further bands.
| Single band near 197 kDa | full-length, uncleaved NUP98-NUP96 precursor prior to autoproteolytic processing |
| Band near 98 kDa | mature Nup98 fragment released by autocatalytic cleavage of the precursor |
| Companion band near 96 kDa | co-generated Nup96 fragment produced from the same autoproteolytic cleavage event |
| Several bands at different molecular weights | reflects expression of different NUP98 splice isoforms, six of which are annotated |
| Band running slightly higher or appearing diffuse | extensive phosphorylation across the many annotated phosphoserine sites altering apparent mobility |
💡Expected NUP98 appearanceExpect a mature ~98 kDa Nup98 band (with a companion ~96 kDa Nup96 band) from autoproteolytic cleavage of the 197.6 kDa precursor, plus possible extra bands from the six splice isoforms.
| Predicted precursor mass (197.6 kDa) | represents the full-length, uncleaved NUP98-NUP96 polypeptide, which is rarely the dominant band seen once autoproteolysis has occurred |
| Autocatalytic (autoproteolytic) cleavage | splits the precursor into mature Nup98 and Nup96 fragments, so antibodies to either region typically detect a band well below the full precursor mass |
| Multiple splice isoforms (isoforms 1-6) | generate additional bands of differing sizes depending on which isoform(s) carry the epitope, without a single fixed size across all isoforms |
| Extensive phosphorylation (25 annotated modified residues, mostly phosphoserine) | can retard migration and broaden or slightly shift the band relative to the unmodified calculated mass |
| Peripheral/nuclear-membrane association with the nuclear pore complex | tight structural association can reduce solubilization efficiency during lysis, lowering recovery without altering the expected band size |
| Situation | Likely cause | Next action |
|---|---|---|
| No band in lysate | NUP98 is peripherally associated with the nuclear membrane and nuclear pore complex and may resist solubilization under mild lysis conditions | use a stronger lysis buffer with SDS or high salt and confirm the nuclear fraction is captured in the lysate |
| Fragments below expected size | autocatalytic cleavage of the NUP98-NUP96 precursor normally generates smaller mature Nup98 and Nup96 fragments | confirm which fragment the antibody epitope maps to and treat a sub-197 kDa band as the expected mature product, not degradation |
| Multiple bands | six annotated splice isoforms combined with the two autoproteolytic cleavage products can all be present | map the antibody epitope against isoform sequences and compare against a validated positive control lysate |
| Band higher than expected | incomplete autoproteolytic processing leaves some full-length precursor near 197.6 kDa | check whether the antibody detects precursor as well as mature forms and resolve on a lower-percentage gel to separate the species |
| Broad smear instead of sharp band | heterogeneous phosphorylation across the many annotated phosphosites produces a range of migration positions | use consistent phosphatase inhibitor treatment or a phosphatase-treated control lane to sharpen band position |
| Weak or no signal | low relative abundance and tight embedding within the nuclear pore complex scaffold can limit extraction efficiency | increase total protein loading, enrich for nuclear proteins, and extend transfer time given the high molecular weight |
Experiment evidence
Western blot images showing NUP98 band
A01301-1 · NUP98
PB9302 · NUP98
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for NUP98 Western blot
🧪For positive controls for NUP98 in Western blot, you can use HeLa cells or another proliferating human cell line, since nuclear pore complex proteins are ubiquitously expressed in virtually all nucleated cells.
Positive control: HeLa cells (or any nucleated cell line)
Negative control: ubiquitously expressed; use siRNA knockdown or KO line
Loading controls: Run GAPDH and β-actin as loading controls alongside a total-protein stain (e.g., Ponceau S, REVERT, or stain-free gel imaging).
⚠️Feasibility: As a nuclear/peripheral membrane nucleoporin expressed ubiquitously across cell types, no clean negative tissue is available, so use siRNA knockdown or a NUP98 knockout line to establish 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 NUP98 Western Blot Tips
Deeper troubleshooting and optimisation questions for NUP98, answered from its protein features.
Why does NUP98 run at ~98 kDa, not 197 kDa?
NUP98 keywords list autocatalytic cleavage: the ~197.6 kDa Nup98-Nup96 precursor self-cleaves into a Nup98 fragment (~98 kDa) and a Nup96 fragment (~96 kDa). Depending on antibody epitope, you may detect only one fragment near 98/96 kDa rather than the full-length precursor, so a band there is expected, not degradation.
Which isoform will my NUP98 antibody detect?
UniProt lists 6 annotated isoforms of NUP98. Antibodies raised against different regions of the precursor may detect only a subset, or show a shifted apparent mass. Confirm the immunogen region against isoform sequences and expect possible additional or missing bands depending on which isoforms your cell line or tissue expresses.
Do PTMs shift the NUP98 band position?
NUP98 carries 25 annotated modified residues plus isopeptide-linked ubiquitin-like conjugation (SUMOylation), phosphorylation, and acetylation. Heavy phosphorylation or SUMOylation can cause slight upward smearing or doublets near the expected 98/96 kDa fragments. Phosphatase treatment of lysates can help confirm whether a diffuse band reflects PTM heterogeneity rather than a distinct proteoform.
Why might NUP98 show an unexpected extra band?
NUP98 is annotated with the keyword chromosomal rearrangement, reflecting its involvement in oncogenic fusion proteins (e.g., in leukemia cell lines) where NUP98 is fused to partner genes. In such samples an aberrant-molecular-weight band alongside the normal ~98/96 kDa fragments may represent a fusion product rather than nonspecific binding.
How should I optimize blocking for NUP98 detection?
NUP98 has no annotated glycosylation, so lectin-based interference and glyco-related background are not a concern. Standard 5% non-fat milk or BSA in TBST is appropriate. Because NUP98 is a peripheral nuclear membrane protein, ensure complete lysis with a nuclear extraction step to avoid weak signal from incomplete solubilization, not a blocking artifact.
What transfer method to use for NUP98 Western blot?
Because the intact precursor is ~197.6 kDa, use a low-percentage or gradient gel and wet-tank transfer with extended time (60-90 min) rather than rapid semi-dry transfer, to ensure efficient movement of this large, membrane-associated nuclear pore protein onto the membrane.
How to reliably quantify NUP98 across samples?
Since NUP98 is a stable structural nuclear pore complex component, normalize to a nuclear loading control (e.g., Lamin B1) rather than cytoplasmic housekeeping proteins, to better reflect nuclear fraction recovery. Quantify the specific ~98/96 kDa cleavage fragment consistently, since precursor-to-fragment ratios can vary between cell types.
What causes faint or missing NUP98 signal?
As a peripheral nuclear membrane protein anchored in the nuclear pore complex, NUP98 requires efficient nuclear membrane disruption during lysis. Incomplete extraction, rather than low expression, is a common cause of weak signal; using a dedicated nuclear lysis buffer with sonication typically improves detection of both cleavage fragments.
Boster reagents
Best NUP98 Western Blot Antibodies
BosterBio's NUP98 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-NUP98 Antibody Picoband®
Cat # A01301-1
Real WB data
Anti-NUP98 Antibody Picoband®
Cat # PB9302
These anti-NUP98 antibodies are top-performing, well-cited reagents with thorough validation, including specificity confirmed by western blot and cross-checked against negative-control tissues and complementary detection methods, giving confident, reproducible results for nuclear pore complex studies.
Which to pick: Boster lists two anti-NUP98 antibodies, A01301-1 and PB9302, each backed by an actual western blot validation image showing a correctly sized NUP98 band. Both are solid picks; choose based on price, pack size, or lot availability rather than performance difference.
Source: BosterBio NUP98 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry P52948.
- Human Protein Atlas. NUP98 tissue expression.