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- Table of Contents
SPHK2 · Western blot design guide
Design a Western Blot for SPHK2
Real validated SPHK2 Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-SPHK2 WB antibodies. Everything you need to plan the experiment before you commit precious samples.
Last reviewed: May 2026 · Scientific review: Boster Bio technical team
SPHK2 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 | ~69.2 kDa | |
| Observed band | ~69 kDa | |
| Gel | 10–12% | |
| Negative control | siRNA / KO lysate |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Phosphorylated | |
| Caveat | Multiple splice isoforms | |
| Regulation | Kras signaling dn | |
| Isoform | 5 isoform(s) |
Section 1
Real Curated SPHK2 Western Blot Protocols
Literature-validated Western blot parameters for SPHK2 — gel percentage, transfer, blocking, antibody incubation and detection, extracted from published methods.
| Sample / lysate | human HCT116 , Lane 2: human Hela , Lane 3: rat liver , Lane 4: rat kidney , Lane 5: mouse liver , Lane 6: mouse kidney . 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-SPHK2 antigen affinity purified polyclonal antibody (A01382-1) 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 (Catalog # BA1054) 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 SPHK2 at approximately 69 kDa. The expected band size for SPHK2 is at 69 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 | 69 kDa |
Section 2
What Is the Expected SPHK2 Western Blot Band Size?
SPHK2 has a 69.2 kDa predicted mass and runs at the expected ~69 kDa, since it lacks glycosylation, disulfide dimerization, or cleavage that would shift migration.
| single sharp band at ~69 kDa | matches the 69.2 kDa predicted mass of full-length SPHK2, with no glycosylation, cleavage, or dimerization to shift it |
| extra band(s) slightly above or below the main ~69 kDa band | reflects co-expression of different SPHK2 splice isoforms (5 annotated isoforms) rather than nonspecific binding |
| no diffuse smear above the main band | SPHK2 has no annotated glycosylation sites, so there is no heterogeneous glycoform smearing to broaden the band |
| no doubling of band size (~140 kDa) even without full reduction | SPHK2 has no inter-chain disulfide bonds, so it does not form a covalent homodimer and always resolves as monomer |
| signal present directly in whole-cell or tissue lysate | SPHK2 is cytoplasmic/nuclear, not secreted, so the intact protein is retained intracellularly and detectable without media concentration |
💡Expected SPHK2 appearanceExpect a single band at approximately 69 kDa, matching the 69.2 kDa predicted mass of full-length SPHK2, since it has no glycosylation, disulfide dimerization, or proteolytic cleavage to shift its migration.
| Predicted molecular mass (69.2 kDa, 654 aa) | sets the baseline migration; SPHK2 runs very close to this, at the observed ~69 kDa |
| Alternative splicing (5 annotated isoforms, 1-5) | co-expressed isoforms can appear as additional bands slightly above or below the canonical ~69 kDa band depending on which exons are included |
| Absence of glycosylation sites | no glycoform smearing or upward mass shift; the band stays sharp and close to predicted size |
| Absence of inter-chain disulfide bonds | no covalent homodimer band forms, so migration is unaffected by reducing vs non-reducing conditions |
| Situation | Likely cause | Next action |
|---|---|---|
| Multiple bands | five annotated splice isoforms of SPHK2 can be co-expressed | compare the pattern against isoform reference sizes or use an isoform-specific antibody to confirm identity |
| Band higher than expected | multi-site phosphorylation (7 phosphosites, including MAPK and PKD substrates) can slightly retard migration | treat lysate with a phosphatase and confirm the band collapses toward the ~69 kDa unmodified size |
| Weak or no signal | endogenous SPHK2 expression is low and varies across cell lines and tissues | increase total protein loaded (30 ug or more) and include a known-positive lysate such as liver or kidney tissue as a control |
| Fragments below expected size | proteolytic degradation of the intracellular kinase during lysis | lyse fresh with protease inhibitors and keep samples cold throughout preparation |
| No band in lysate | tissue- or cell-type-specific expression means some lysates may lack detectable SPHK2 despite it being intracellular and not secreted | screen a panel of lysates to confirm SPHK2 expression in the chosen sample before troubleshooting the antibody |
Experiment evidence
Western blot images showing SPHK2 band
A01382-1 · SPHK2
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for SPHK2 Western blot
🧪For positive controls for SPHK2 in Western blot, you can use lysate from cells transiently overexpressing SPHK2 (e.g., HEK293 or HeLa cells transfected with an SPHK2 expression construct), since Human Protein Atlas does not report a clear high-expressing endogenous tissue for this target.
Positive control: SPHK2-overexpressing HEK293 lysate
Negative control: ubiquitously expressed; use siRNA knockdown or KO line
Loading controls: Alongside your target blot, run GAPDH and β-actin antibodies plus a total-protein stain (e.g., stain-free gel, Ponceau S, or REVERT) to confirm equal loading and transfer.
⚠️Feasibility: With no HPA expression data to identify a reliable high- or non-expressing tissue for SPHK2, endogenous controls are hard to validate, so an overexpression lysate paired with siRNA knockdown or a knockout line is the more feasible way 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 SPHK2 Western Blot Tips
Deeper troubleshooting and optimisation questions for SPHK2, answered from its protein features.
Does SPHK2 run at its predicted molecular weight?
Yes. Predicted mass is 69.2 kDa and the observed band runs at approximately 69 kDa, showing close agreement. No signal peptide or propeptide is cleaved, so no size discrepancy from processing is expected. A band at this position on a standard gel is consistent with full-length SPHK2.
Could multiple SPHK2 isoforms appear on the blot?
SPHK2 has 5 annotated isoforms generated by alternative splicing. Depending on antibody epitope location and which isoforms are expressed in the sample, additional bands above or below 69 kDa may appear. Confirm the immunogen region against isoform sequences to determine which variants your antibody can detect.
Why might SPHK2 show slight mobility shifts?
SPHK2 is annotated as a phosphoprotein with 7 modified residues. Phosphorylation at these sites can cause subtle upward mobility shifts on SDS-PAGE. If a diffuse or doublet band appears near 69 kDa, phosphatase treatment of a parallel sample can help confirm whether phosphorylation is the cause.
How should blocking be optimized for SPHK2 detection?
SPHK2 has no annotated glycosylation, so lectin-based or glycan-related blocking artifacts are not a concern. Standard 5% non-fat milk or BSA in TBST is appropriate. Since SPHK2 is present in both cytoplasmic and nuclear compartments, ensure fractionation buffers are compatible with the blocking protocol if compartment-specific detection is needed.
What transfer method to use for SPHK2 Western blot?
At 69.2 kDa, SPHK2 transfers efficiently with standard wet or semi-dry transfer using a 0.45 µm PVDF or nitrocellulose membrane. No membrane-spanning domains are annotated, so extended transfer times for hydrophobic proteins are not required; standard 60-90 minute wet transfer at 100V is sufficient.
What loading control fits SPHK2 quantitation experiments?
Because SPHK2 localizes to cytoplasm, nucleus, ER, mitochondria, and lysosomes, whole-cell lysates should use a standard housekeeping control like GAPDH or tubulin. For subcellular fractionation studies, pair nuclear fractions with a nuclear marker and cytoplasmic fractions with a cytoplasmic marker to accurately normalize compartment-specific SPHK2 signal.
How to interpret unexpected higher molecular weight bands?
SPHK2 interacts with histone H3, HDAC1, HDAC2, MBD2, and SIN3A in the nucleus, and with EEF1A1 in the cytoplasm. Under incomplete denaturation, co-migrating complex components could contribute to higher apparent bands. Ensure thorough sample boiling and reducing conditions to resolve monomeric SPHK2 from associated complex partners.
Boster reagents
Best SPHK2 Western Blot Antibodies
BosterBio's SPHK2 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-SPHK2 Antibody Picoband®
Cat # A01382-1
Our recommended anti-SPHK2 antibody is a best-performing, highly cited reagent thoroughly validated for Western blot, with specificity confirmed through orthogonal cross-validation against negative tissue controls and complementary detection methods, ensuring reliable, reproducible results for SPHK2 detection.
Which to pick: Only one Boster SPHK2 antibody is listed, A01382-1, which includes an actual Western blot validation image demonstrating specific detection, making it the clear choice for your SPHK2 WB experiments.
Source: BosterBio SPHK2 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry Q9NRA0.
- Human Protein Atlas. SPHK2 tissue expression.