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- Table of Contents
EMX1 / Homeobox protein EMX1 · Western blot design guide
Design a Western Blot for EMX1
Real validated EMX1 Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-EMX1 WB antibodies. Everything you need to plan the experiment before you commit precious samples.
Evidence assembled September 2026 · For research use; verify linked source records and product datasheet before use
EMX1 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 | ~31.3 kDa | |
| Gel | 12–15% (standard starting point) | |
| Positive control | Kidney (IHC candidate; verify WB) +4 more | |
| Negative control | Adipose tissue (IHC candidate; verify WB) |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | — | |
| Caveat | Fractionation controls | |
| Gene-set association | MSigDB C7 membership | |
| Isoform | 2 isoform(s) |
Section 1
Real Curated EMX1 Western Blot Protocols
The A06307-1 protocol combines labelled catalog values with standard starting conditions. Published comparisons retain their own sample, reagent and detection scope.
| Sample / lysate | HuvEC cells (catalog A06307-1) |
| Gel % | 12–15% (standard starting point) |
| Load | 20–30 µg total protein per lane; optimize for abundance (standard starting point) |
| Transfer | Standard semi-dry transfer; verify efficiency (standard starting point) |
| Membrane | 0.45 µm PVDF (standard starting point) |
| Blocking | 5% milk or 5% BSA in TBST (standard starting point) |
| Primary antibody | A06307-1; use the WB datasheet starting dilution (standard starting point) |
| Primary incubation | Overnight at 4 °C (standard starting point) |
| Secondary antibody | Species-matched HRP conjugate at validated dilution (standard starting point) |
| Secondary incubation | 1 h at room temperature (standard starting point) |
| Wash | 3 × 5 min in TBST (standard starting point) |
| Detection | ECL; bracket exposures to avoid saturation (standard starting point) |
Section 2
What Is the Expected EMX1 Western Blot Band Size?
EMX1 is predicted at 31.3 kDa; splice isoforms could affect migration, but distinct bands have not been demonstrated here.
| Band near 31.3 kDa | Consistent with the predicted EMX1 mass; identity requires confirmation |
| One band near the predicted size | EMX1 isoforms 1 and 2 may not resolve as separate bands |
| Additional band at a different size | Could represent an EMX1 splice isoform; identity requires confirmation |
| Band in a nuclear fraction | Consistent with EMX1 nuclear localization |
| Band in a cytoplasmic fraction | Consistent with EMX1 cytoplasmic localization |
💡Expected EMX1 appearanceUniProt predicts 31.3 kDa for EMX1; no empirical band size is supplied, and any additional band attributed to isoform 1 or 2 needs an identity control.
| UniProt predicted mass | Places the reference size near 31.3 kDa |
| Splice isoform 1 | Its apparent size relative to isoform 2 is not supplied |
| Splice isoform 2 | Its apparent size relative to isoform 1 is not supplied |
| Alternative splicing | May affect band size, but distinct migration is not established |
| Situation | Likely cause | Next action |
|---|---|---|
| No band in lysate | EMX1 signal may be too weak in whole-cell lysate | Check a nuclear fraction and a positive control |
| Band higher than expected | An isoform is possible, but the band identity is unestablished | Compare with EMX1 knockdown and a molecular-weight marker |
| Band lower than expected | An isoform is possible, but its size is not supplied | Confirm the band with EMX1 knockdown or a second antibody |
| Multiple bands | EMX1 has isoforms 1 and 2, though their migration is unknown | Test which bands respond to EMX1 knockdown |
| Weak or no signal | EMX1 may be diluted across whole-cell lysate | Compare whole-cell, nuclear, and cytoplasmic fractions with loading controls |
Experiment evidence
Western blot images showing EMX1 band
A06307-1 · EMX1
A06307-1 · EMX1
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for EMX1 Western blot
🧪HPA-IHC candidate guidance (verify in WB): For positive controls for EMX1 in Western blot, you can use kidney tissue lysate, which has high HPA expression.
Positive control: Kidney (IHC candidate; verify WB)
Negative control: Adipose tissue (IHC candidate; verify WB)
Loading controls: Run GAPDH, β-actin, and a total-protein stain alongside the samples.
⚠️Feasibility: Kidney and adipose tissue offer a feasible contrast, though HPA not detected does not guarantee no Western-blot signal.
HPA tissue expression evidence for EMX1
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.
Higher expression tissues · candidate positive controls from IHC
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Kidney | cells in tubules | High | Protein (IHC) | HPA → |
| Caudate | glial cells | Medium | Protein (IHC) | HPA → |
| Cerebellum | cells in granular layer | Medium | Protein (IHC) | HPA → |
| Cerebral cortex | endothelial cells | Medium | Protein (IHC) | HPA → |
| Hippocampus | glial cells | Medium | Protein (IHC) | HPA → |
Lower expression tissues · IHC evidence, not confirmed WB-negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Adipose tissue | adipocytes | Not detected | Protein (IHC) | HPA → |
| Adrenal gland | glandular cells | Not detected | Protein (IHC) | HPA → |
| Appendix | glandular cells | Not detected | Protein (IHC) | HPA → |
| Bone marrow | hematopoietic cells | Not detected | Protein (IHC) | HPA → |
| Breast | adipocytes | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced EMX1 Western Blot Tips
Deeper troubleshooting and optimisation questions for EMX1, answered from its protein features.
Where should the canonical EMX1 band appear?
Band shift · The supplied predicted mass is 31.3 kDa for the 290-residue canonical sequence. No empirical band position is available, so use 31.3 kDa as a reference rather than an expected apparent mass.
Could EMX1 isoforms produce different bands?
Isoforms · UniProt lists two isoforms. In isoform 2, canonical residues 1–171 are missing and residues 172–173 change from FQ to MV. A shorter band is plausible, but these features alone do not establish where either isoform migrates.
Check the antibody epitope against the UniProt canonical sequence. An epitope within residues 1–171 would be absent from isoform 2; one spanning residues 172–173 may be affected by its FQ-to-MV substitution. Confirm the antibody’s stated epitope before interpreting a missing band.
Check the antibody epitope against the UniProt canonical sequence. An epitope within residues 1–171 would be absent from isoform 2; one spanning residues 172–173 may be affected by its FQ-to-MV substitution. Confirm the antibody’s stated epitope before interpreting a missing band.
Do annotated modifications explain an EMX1 band shift?
PTM · The supplied UniProt features list no modified residues or glycosylation sites. They therefore provide no specific modification-based explanation for a shifted band; they also do not establish that modification cannot occur.
Does this guide establish induction of EMX1?
Induction · No general induction response is established by this guide. A pathway or gene-set association is not evidence of induction in a particular specimen. Verify the relevant treatment and control in a target-specific experiment.
How should transfer be checked for EMX1?
Transfer · Standard workflow guidance: verify transfer efficiency for the intended target size before interpreting a weak signal. Use total-protein assessment and optimize transfer for the membrane, gel and apparatus; the labelled catalog values take precedence.
How should blocking be optimized?
Blocking · Standard workflow guidance: follow the A06307-1 datasheet where specified. Otherwise compare 5% milk or 5% BSA in TBST; for a phospho-specific assay start with BSA. Optimize background and specific signal with matched controls.
How should EMX1 bands be quantified across samples?
Quantitation · Use the same sample fraction and band definition across samples. EMX1 has two annotated isoforms and occurs in both nuclear and cytoplasmic compartments, so a single band or fraction may not represent all detectable EMX1.
Which fraction should be checked for EMX1?
Interpretation · EMX1 is reported in both the nucleus and cytoplasm and may shuttle between them. If using fractionated samples, examine both fractions before interpreting a weak signal in either one.
Compare it with the 31.3 kDa canonical prediction and consider isoform 2’s loss of residues 1–171. Check whether the antibody epitope is retained in isoform 2. Neither the sequence differences nor the predicted mass alone identifies an observed band.
Compare it with the 31.3 kDa canonical prediction and consider isoform 2’s loss of residues 1–171. Check whether the antibody epitope is retained in isoform 2. Neither the sequence differences nor the predicted mass alone identifies an observed band.
Boster reagents
EMX1 Western Blot Antibodies
Catalog antibodies with Western blot application and product-specific WB images. Evaluate suitability with the reported sample, controls and experimental conditions.
Real WB data
Anti-Homeobox protein EMX1 Emx1 Antibody
Cat # A06307-1
The catalog reports A06307-1, an anti-EMX1 polyclonal antibody with reported human, mouse, and rat reactivity. Its Western blot image shows HuvEC cell nuclear extract prepared with a fractionation kit; the supplied evidence does not show mouse or rat blots.
Which to pick: A06307-1 is the only listed option. Its WB image uses HuvEC nuclear extract, making that the directly illustrated sample context. Human, mouse, and rat reactivity is reported, but the supplied image does not establish WB performance in mouse or rat samples.
Source: BosterBio EMX1 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry Q04741.
- Human Protein Atlas. EMX1 tissue expression.
- PMC9392518 — target-verified WB comparison
- PMC5505202 — target-verified WB comparison
- PMC8348834 — target-verified WB comparison