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MAD2L1 · Western blot design guide
Design a Western Blot for MAD2L1
Real validated MAD2L1 Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-MAD2L1 WB antibodies. Everything you need to plan the experiment before you commit precious samples.
Last reviewed: May 2026 · Scientific review: Boster Bio technical team
MAD2L1 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 | ~23.5 kDa | |
| Observed band | ~24 kDa | |
| Gel | 12–15% | |
| Negative control | siRNA / KO lysate |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Phosphorylated + Acetylated | |
| Caveat | Phosphorylation-induced shift | |
| Regulation | MYC up | |
| Isoform | 2 isoform(s) |
Section 1
Real Curated MAD2L1 Western Blot Protocols
Literature-validated Western blot parameters for MAD2L1 — gel percentage, transfer, blocking, antibody incubation and detection, extracted from published methods.
| Sample / lysate | human 293T , Lane 2: human Raji , Lane 3: human THP-1 , Lane 4: human Hela , Lane 5: rat RH35 , Lane 6: 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-Mad2L1 antigen affinity purified polyclonal antibody (Catalog # PB9282) 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 ECL Plus Western Blotting Substrate (Catalog # AR1196-200) with Tanon 5200 system. A specific band was detected for Mad2L1 at approximately 24 kDa. The expected band size for Mad2L1 is at 24 kDa |
| Gel % | 12–15% |
| 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 | 24 kDa |
Section 2
What Is the Expected MAD2L1 Western Blot Band Size?
MAD2L1 has a 23.5 kDa unmodified backbone and runs at ~24 kDa on Western blot, consistent with predicted mass since it lacks glycosylation or cleavage to inflate it.
| Single band around 24 kDa | Matches the unmodified 23.5 kDa predicted mass, since MAD2L1 has no glycosylation, signal peptide, or propeptide to shift it |
| Faint second band at a slightly different size | May reflect the second annotated splice isoform rather than nonspecific binding |
| Band appears as a tight doublet or slightly diffuse near 24 kDa | Consistent with the 6 annotated phosphoserine residues driving minor mobility heterogeneity, especially in mitotic-enriched lysates |
| Solid band present in standard whole-cell lysates | MAD2L1 is nuclear/kinetochore/cytoplasmic, not secreted, so it is retained and detectable in routine whole-cell lysate preps |
| No higher-molecular-weight band despite MAD2L1's dimer biology | The monomer/homodimer equilibrium is non-covalent with no annotated disulfide bonds, so reducing SDS-PAGE collapses it to the single monomer band |
💡Expected MAD2L1 appearanceExpect a single sharp band at ~24 kDa, closely matching the 23.5 kDa predicted mass since MAD2L1 has no glycosylation, signal peptide, or disulfide-linked dimer to shift it; a faint minor-isoform band may also appear.
| Predicted mass from UniProt | 205 aa, 23.5 kDa unmodified backbone sets the baseline migration near the observed ~24 kDa band |
| Splice isoforms (named 1 and 2) | A second annotated isoform can add a distinct, less intense band at a different apparent mass alongside the canonical one |
| Phosphorylation (6 annotated phosphoserines) | Extensive, cell-cycle-linked phosphorylation can cause a slight upward mobility shift or tight doublet, especially in mitotic-enriched samples |
| Homodimer formation (oligomeric state) | MAD2L1 self-associates as monomer/homodimer, but with no disulfide bonds annotated this is disrupted by SDS and reducing buffer, so it does not add mass on standard denaturing blots |
| Situation | Likely cause | Next action |
|---|---|---|
| No band in lysate | MAD2L1 is a cell-cycle/mitotic checkpoint protein with cyclical expression, so quiescent or non-dividing cell populations may express little of it | Use actively dividing or mitotically arrested/synchronized cell lines and confirm with a proliferation or mitotic marker |
| Multiple bands | Two annotated splice isoforms can both be detected if the antibody epitope is shared between them | Check the antibody epitope location against the isoform sequences to determine if both bands are expected |
| Band higher than expected | Cell-cycle-regulated phosphorylation at multiple annotated serine residues can slow migration during mitosis | Compare asynchronous versus mitotic-arrested lysates, or treat with phosphatase to confirm the shift resolves |
| Weak or no signal | MAD2L1 is a comparatively low-abundance checkpoint protein concentrated at the nucleus and kinetochore during mitosis | Enrich for mitotic cells, increase total protein loading, or use a nuclear/chromatin-focused extraction protocol |
| Broad smear instead of sharp band | Incomplete solubilization of the chromatin- and kinetochore-associated pool, not intrinsic modification, since no glycosylation is annotated | Use a stronger lysis buffer with nuclease treatment and fresh reducing agent to fully solubilize nuclear-associated protein before loading |
Experiment evidence
Western blot images showing MAD2L1 band
PB9282 · MAD2L1
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for MAD2L1 Western blot
🧪For positive controls for MAD2L1 in Western blot, you can use a proliferating cell line such as HeLa, since MAD2A is a cell-cycle-dependent mitotic checkpoint protein expressed in actively dividing cells rather than a tissue with reported HPA-specific enrichment.
Positive control: HeLa cells (proliferating)
Negative control: ubiquitously expressed; use siRNA knockdown or KO line
Loading controls: Alongside MAD2L1, run GAPDH and β-actin as standard loading controls plus a total-protein stain (stain-free gel, Ponceau S, or REVERT) to normalize for transfer and loading variability.
⚠️Feasibility: No HPA tissue expression data are available for MAD2L1, and as a mitotic checkpoint protein present in essentially all cycling cells there is no clean tissue-based negative control, so use siRNA/CRISPR knockdown, a non-dividing/quiescent cell population, or a KO line as the negative comparator.
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 MAD2L1 Western Blot Tips
Deeper troubleshooting and optimisation questions for MAD2L1, answered from its protein features.
Does MAD2L1 run at its predicted molecular weight?
Yes. Predicted mass is 23.5 kDa and the observed band runs at ~24 kDa, a close match with no major shift. Minor upward shifts can occur in mitotic lysates due to phosphorylation (7 modified residues annotated), so compare interphase vs mitotic-arrested samples if band position varies.
Could the second MAD2L1 isoform appear as an extra band?
MAD2L1 has 2 annotated isoforms. If your antibody epitope is present in both, isoform 2 may resolve as an additional band of different apparent size on a high-percentage gel. Confirm which isoform your antibody targets and use a high-resolution gel to separate closely spaced bands.
Why might MAD2L1 show multiple close bands by phosphorylation?
MAD2L1 is a phosphoprotein with 7 reported modified residues, consistent with cell-cycle-dependent regulation during the spindle assembly checkpoint. Phosphorylation during mitosis can cause a slight mobility shift or doublet. Synchronizing cells in mitosis (e.g., nocodazole arrest) can enrich the modified form for comparison.
Why use denaturing/reducing conditions for MAD2L1 detection?
MAD2L1 exists as a monomer and homodimer, and heterodimerizes with MAD1L1 to form a tetrameric complex. Without full denaturation and reduction, oligomeric or complexed forms can persist and skew quantitation. Boil samples in SDS-PAGE sample buffer with reducing agent to ensure detection reflects monomeric MAD2L1 only.
What transfer method to use for MAD2L1 Western blot?
At ~24 kDa, MAD2L1 is a small protein, so use a lower percentage or gradient gel and a shorter, lower-voltage transfer (semi-dry or wet) with 0.2 µm PVDF or nitrocellulose to prevent blow-through. Monitor transfer time closely since small proteins over-transfer quickly on standard protocols.
What could explain higher-molecular-weight MAD2L1 bands?
MAD2L1 heterodimerizes with MAD1L1 forming a tetrameric MAD1L1-MAD2L1 core complex, and self-associates as a homodimer. Incomplete denaturation can leave these complexes intact, producing bands well above 24 kDa. Increase SDS concentration and boiling time, or use fresh reducing agent, to resolve this.
Where should MAD2L1 signal localize if using cell fractionation?
MAD2L1 localizes to the nucleus, cytoplasm, chromosome/kinetochore, and spindle pole, with recruitment to unattached kinetochores and the nuclear pore complex. If fractionating lysates, expect signal in both nuclear and cytoplasmic fractions, with enrichment at kinetochores in mitotic-enriched preparations.
Boster reagents
Best MAD2L1 Western Blot Antibodies
BosterBio's MAD2L1 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-Mad2L1 Antibody Picoband®
Cat # PB9282
The featured anti-MAD2L1 antibody below represents Boster's best-performing option for Western blot, selected for its strong citation record, rigorous validation, and orthogonal confirmation through complementary methods and negative tissue controls, ensuring specific, reproducible detection of MAD2L1 across experimental systems.
Which to pick: Only one MAD2L1 antibody is catalogued here, PB9282, so it's the clear choice: it includes an actual Western blot validation image on 12% SDS-PAGE, confirming specific detection and giving you a direct visual reference for expected band pattern.
Source: BosterBio MAD2L1 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry Q13257.
- Human Protein Atlas. MAD2L1 tissue expression.