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GMPS · Western blot design guide
Design a Western Blot for GMPS
Real validated GMPS Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-GMPS WB antibodies. Everything you need to plan the experiment before you commit precious samples.
Last reviewed: May 2026 · Scientific review: Boster Bio technical team
GMPS 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 | ~76.7 kDa | |
| Gel | 10–12% | |
| Negative control | siRNA / KO lysate |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Phosphorylated + Acetylated | |
| Caveat | Multiple isoforms possible | |
| Regulation | Heme metabolism | |
| Isoform | 2 isoform(s) |
Section 1
Real Curated GMPS Western Blot Protocols
Literature-validated Western blot parameters for GMPS — gel percentage, transfer, blocking, antibody incubation and detection, extracted from published methods.
| Sample / lysate | human HEK293 , Lane 2: human A431 , Lane 3: human HL-60 , Lane 4: human COLO320 , Lane 5: human Raji , Lane 6: human THP-1 , Lane 7: human Jurkat , Lane 8: human K562 , Lane 9: rat PC-12 , Lane 10: mouse thymus . 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-GMPS antigen affinity purified polyclonal antibody (Catalog # A03643-1) 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 GMPS at approximately 77KD. The expected band size for GMPS is at 77KD |
| 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 | 0.25 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 | 77 kDa |
Section 2
What Is the Expected GMPS Western Blot Band Size?
GMPS is a ~77 kDa cytosolic homodimeric enzyme; expect a single ~77 kDa reducing SDS-PAGE band, with a higher dimer species possible if denaturation is incomplete.
| single band at approximately 77 kDa under reducing, denaturing SDS-PAGE | matches the calculated monomer mass of GMPS (76.7 kDa, 693 aa) since there is no signal peptide, propeptide, or glycosylation to alter migration |
| band near 150-155 kDa on non-reducing or under-denatured gels, in addition to the ~77 kDa band | GMPS functions as a homodimer, and non-covalent dimer contacts can survive incomplete SDS denaturation even without an annotated inter-chain disulfide bond |
| closely spaced doublet or two bands of slightly different size | GMPS has two annotated splice isoforms that can differ enough in length to resolve as separate bands |
| band migrating slightly above the 77 kDa predicted position | phosphorylation at Ser8, Thr318, and Ser332 plus acetylation at Ala2 and Lys9 can subtly retard SDS-PAGE mobility |
| band present in whole-cell or cytosolic lysate but not enriched in secreted/conditioned-medium fractions | GMPS is annotated as a cytoplasmic, cytosolic enzyme, so it is expected intracellularly rather than in extracellular fractions |
💡Expected GMPS appearanceExpect a single band at approximately 77 kDa under reducing SDS-PAGE, matching GMPS's predicted monomer mass since it has no glycosylation, signal peptide, or cleavage site to shift its apparent size.
| Predicted monomer mass | 76.7 kDa (693 aa) sets the expected baseline band position on a reducing SDS-PAGE gel |
| Homodimer formation | non-covalent dimerization without an annotated inter-chain disulfide can leave a higher-molecular-weight dimer species if samples are under-reduced or under-heated, alongside the fully denatured monomer |
| Alternative splicing, isoforms 1 and 2 | two annotated isoforms can differ slightly in length, so lysates may show two bands rather than a single uniform species |
| Phosphorylation and acetylation sites | multiple phosphoserine/phosphothreonine and acetyl-lysine/alanine modifications can cause modest anomalous mobility, nudging the band slightly above the calculated mass |
| Cytoplasmic, cytosolic localization | as an intracellular enzyme, GMPS should be detectable in standard whole-cell or cytosolic lysate preps without needing secretion-focused sample prep |
| Situation | Likely cause | Next action |
|---|---|---|
| Band higher than expected | incomplete reduction or denaturation leaves the native homodimer partially intact | increase reducing agent concentration, extend heat denaturation time, and use fresh sample buffer before loading |
| Multiple bands | co-detection of the two annotated splice isoforms, or a mix of monomer and residual dimer | resolve on a longer or gradient gel and confirm identity with an isoform-aware antibody or peptide competition |
| No band in lysate | low or absent GMPS expression in the sampled cell type despite its cytosolic localization | confirm the cell line or tissue is proliferative and known to express GMPS, and use a lysis buffer that efficiently solubilizes cytosolic protein |
| Weak or no signal | GMPS abundance varies with proliferative state given its role in purine biosynthesis | increase total protein loaded, switch to a highly proliferative or tumor-derived lysate, and use a more sensitive detection substrate |
| Band lower than expected | artifactual proteolytic degradation during lysis, since GMPS has no annotated propeptide or physiological cleavage site | add protease inhibitors to lysis buffer, keep samples cold throughout, and avoid repeated freeze-thaw cycles |
Experiment evidence
Western blot images showing GMPS band
A03643-1 · GMPS
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for GMPS Western blot
🧪For positive controls for GMPS in Western blot, you can use lysate from a common cultured cell line such as HeLa or HEK293, since GMPS is a ubiquitously expressed cytosolic housekeeping enzyme and no tissue-specific HPA expression data are available for this protein.
Positive control: HeLa cell lysate
Negative control: ubiquitously expressed; use siRNA knockdown or KO line
Loading controls: Run GAPDH, β-actin, and a total-protein stain (e.g., stain-free gel imaging, Ponceau S, or REVERT) alongside GMPS as loading controls.
⚠️Feasibility: GMPS is a ubiquitous cytosolic enzyme with no HPA tissue-specificity data, so no clean negative-control tissue exists; confirm antibody specificity with siRNA knockdown or a CRISPR knockout line instead.
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 GMPS Western Blot Tips
Deeper troubleshooting and optimisation questions for GMPS, answered from its protein features.
Why does GMPS run close to its 76.7 kDa prediction?
GMPS has no signal peptide, propeptide, glycosylation, or disulfide bonds, so under reducing SDS-PAGE the monomer runs close to its calculated 76.7 kDa mass. The five annotated modified residues (phosphorylation, acetylation) are too small individually to cause a resolvable mobility shift on standard gels.
Could GMPS show two bands from its isoforms?
UniProt annotates two GMPS isoforms (1 and 2) generated by alternative splicing. Depending on which exons the antibody epitope spans, isoform 2 may appear as a second, slightly shifted band. Confirm the immunogen region against both isoform sequences before interpreting a doublet as nonspecific.
Do phosphorylation or acetylation marks affect detection?
GMPS is annotated as a phosphoprotein with acetylation among its five modified residues. These modifications rarely shift apparent mass on standard blots but can mask or enhance epitope recognition if the modified residue falls within the antibody-binding region, so signal intensity may vary with cell state.
What blocking buffer minimizes background for GMPS blots?
Since GMPS carries phosphorylation and acetylation marks, use BSA rather than milk when probing with modification-sensitive antibodies, as casein phosphoproteins in milk can cause cross-reactivity. For a total-GMPS antibody targeting an unmodified epitope, standard nonfat milk blocking is acceptable.
What transfer method to use for GMPS Western blot?
At 76.7 kDa, GMPS transfers efficiently with standard wet tank transfer, which is preferred over semi-dry for consistent efficiency in this mid-to-large size range. Use 100V for about 60-90 minutes or overnight at low voltage/4C, confirming full transfer with reversible stain before blocking.
Which loading control is appropriate for GMPS studies?
GMPS localizes to the cytoplasm/cytosol, so pair it with a cytosolic loading control such as GAPDH or beta-actin rather than a membrane or nuclear marker, ensuring the control accurately normalizes for the same subcellular fraction being probed.
What explains unexpected higher-molecular-weight GMPS bands?
GMPS is a proto-oncogene involved in chromosomal rearrangements, so higher-MW bands in leukemia or tumor lysates may reflect fusion proteins rather than antibody nonspecificity. Additionally, incomplete denaturation of the native homodimer can leave residual dimer signal near double the monomer mass; ensure full reduction and boiling.
Boster reagents
Best GMPS Western Blot Antibodies
BosterBio's GMPS 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-GMPS Antibody Picoband®
Cat # A03643-1
Boster's anti-GMPS antibody is a top-performing reagent, widely cited and thoroughly validated, with specificity confirmed through orthogonal cross-validation against negative tissue and complementary detection methods—delivering reliable, reproducible results for GMPS Western blot applications.
Which to pick: Only one GMPS antibody is catalogued here, A03643-1, which includes an actual Western blot validation image demonstrating specific detection—making it the clear, default choice for your GMPS Western blot experiments.
Source: BosterBio GMPS gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry P49915.
- Human Protein Atlas. GMPS tissue expression.