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CPEB1 / Cytoplasmic polyadenylation element-binding protein 1 · Western blot design guide
Design a Western Blot for CPEB1
Source-linked CPEB1 Western blot protocol options, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-CPEB1 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
CPEB1 Western Blot Experimental Design Guide
Expected bands, source-linked protocol options, controls and antibodies — the at-a-glance facts below, then the full design guide.
Must know before running
| Expected band | ~62.6 kDa | |
| Gel | 12–15% (standard starting point) | |
| Negative control | Suggested KO / knockdown lysate |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Phosphorylated | |
| Caveat | Phosphorylation-state controls | |
| Gene-set association | MSigDB C7 membership | |
| Isoform | 4 isoform(s) |
Section 1
Source-Linked CPEB1 Western Blot Protocol Options
The A03578 protocol combines labelled catalog values with standard starting conditions. Published comparisons retain their own sample, reagent and detection scope.
| Sample / lysate | rat brain tissue lysate (catalog A03578) |
| 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 | A03578 · (A) 1 and (B) 2 μg/mL (catalog A03578) |
| 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 CPEB1 Western Blot Band Size?
CPEB1 is predicted at 62.6 kDa; splice isoforms and phosphorylation could affect bands, but no empirical migration or feature-specific shift is supplied.
| Band near 62.6 kDa | consistent with the predicted CPEB1 mass; identity needs confirmation |
| Several bands at different positions | could reflect isoforms 1, 2, 3, and 4; their migration is unspecified |
| Band above the main band or a doublet | could reflect phosphorylation at Ser43 or Thr172, but a visible shift is unproven |
| Single band without distinct isoform bands | the four annotated isoforms need not produce resolvable bands |
💡Expected CPEB1 appearanceCPEB1 has a predicted mass of 62.6 kDa, but no empirical band size is supplied; confirm any candidate band with antibody and sample controls.
| UniProt predicted mass | places a candidate full-length band near 62.6 kDa |
| Splice isoform 1 | may differ in size from other isoforms; relative migration is unspecified |
| Splice isoform 2 | may differ in size from other isoforms; relative migration is unspecified |
| Splice isoform 3 | may differ in size from other isoforms; relative migration is unspecified |
| Splice isoform 4 | may differ in size from other isoforms; relative migration is unspecified |
| Situation | Likely cause | Next action |
|---|---|---|
| No band in lysate | CPEB1 may be poorly recovered from its cytoplasmic, nuclear, or granule compartments | check fraction recovery and a CPEB1 positive control |
| Band higher than expected | phosphorylation is annotated, but its effect on migration is unknown | compare phosphatase-treated and untreated samples and confirm band identity |
| Band lower than expected | a splice isoform or sample degradation is possible; isoform masses are unspecified | check sample integrity and confirm band identity |
| Multiple bands | four splice isoforms and phosphorylation are annotated, without demonstrated band positions | compare isoform-specific material or phosphatase treatment with appropriate controls |
| Weak or no signal | CPEB1 recovery may vary across its annotated cellular compartments | check loading, fraction recovery, and antibody performance with a positive control |
| Fragments below expected size | sample degradation is possible; no cleavage product is annotated | prepare fresh samples with protease inhibitors and confirm band identity |
Experiment evidence
Western blot images showing CPEB1 band
A03578 · CPEB1
M03578 · CPEB1
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for CPEB1 Western blot
🧪For positive controls for CPEB1 in Western blot, you can use a sample independently validated to express CPEB1, since the supplied HPA evidence identifies no positive tissue or cell line.
Positive control: No high/medium HPA tissue identified
Negative control: Suggested KO / knockdown lysate
Loading controls: Run GAPDH, β-actin, and a total-protein stain alongside the samples.
⚠️Feasibility: With no HPA expression data supplied, tissue controls cannot be selected reliably; a knockdown or KO sample can provide a negative control.
HPA tissue expression evidence for CPEB1
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 |
|---|---|---|---|---|
| No high/medium HPA tissues identified in the supplied evidence. | ||||
Lower expression tissues · IHC evidence, not confirmed WB-negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| No lower-expression tissue rows available in the supplied evidence. | ||||
Section 3
Advanced CPEB1 Western Blot Tips
Deeper troubleshooting and optimisation questions for CPEB1, answered from its protein features.
How should CPEB1 band migration be interpreted?
Band shift · Use the separately labelled calculated mass and catalog-observed evidence above. A sequence annotation does not establish an observed migration shift. Verify target identity with orthogonal controls.
Which CPEB1 isoforms could produce different bands?
Isoforms · Four isoforms are listed. Isoforms 2 and 4 lack canonical residues 1–75; isoforms 3 and 4 lack residues 354–358. Isoform 3 also replaces MALSL with MAFPL at residues 1–5. These differences may affect which bands an antibody detects; the supplied features do not establish their apparent positions.
Yes, if its epitope lies within canonical residues 1–75, which are absent from isoforms 2 and 4. Isoform 3 also changes canonical residues 1–5 from MALSL to MAFPL. Check the antibody epitope against each isoform before interpreting a missing band.
Yes, if its epitope lies within canonical residues 1–75, which are absent from isoforms 2 and 4. Isoform 3 also changes canonical residues 1–5 from MALSL to MAFPL. Check the antibody epitope against each isoform before interpreting a missing band.
Which CPEB1 phosphorylation sites matter when interpreting bands?
PTM · UniProt annotates phosphoserine at canonical position 43 and phosphothreonine at canonical position 172; AURKA and CAMK2A are listed for Thr172. State that these are canonical UniProt coordinates when comparing antibody or paper numbering. Their presence alone does not demonstrate a visible band shift.
Does this guide establish induction of CPEB1?
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 CPEB1?
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 A03578 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 CPEB1 bands be quantified across samples?
Quantitation · Define which isoform or band the antibody detects, then quantify that same signal across samples. CPEB1 is annotated in both nucleus and cytoplasm, among other locations, so keep sample fractions consistent. If measuring Thr172 phosphorylation, distinguish phospho-specific signal from total CPEB1.
Should CPEB1 run at its predicted 62.6 kDa?
Interpretation · The canonical protein has a predicted mass of 62.6 kDa. No observed band position is supplied. Phosphorylation and alternative sequences are annotated, but those features alone do not establish an apparent mass or explain a difference from 62.6 kDa.
Thr172 phosphorylation is attributed to AURKA and CAMK2A in the supplied features. If comparing conditions that affect either kinase, measure total CPEB1 alongside any phospho-specific signal. The annotation does not establish that kinase activity changes CPEB1 abundance or migration in your samples.
Check antibody recognition of the four annotated isoforms, especially the 1–75 and 354–358 deletions, and consider the annotated Ser43 and Thr172 phosphorylation sites. Compare band patterns across consistent sample preparations or fractions. None of these features alone identifies an unexpected band or proves a mobility shift.
Thr172 phosphorylation is attributed to AURKA and CAMK2A in the supplied features. If comparing conditions that affect either kinase, measure total CPEB1 alongside any phospho-specific signal. The annotation does not establish that kinase activity changes CPEB1 abundance or migration in your samples.
Check antibody recognition of the four annotated isoforms, especially the 1–75 and 354–358 deletions, and consider the annotated Ser43 and Thr172 phosphorylation sites. Compare band patterns across consistent sample preparations or fractions. None of these features alone identifies an unexpected band or proves a mobility shift.
Boster reagents
CPEB1 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-CPEB1 Antibody
Cat # A03578
Real WB data
Anti-CPEB1 Rabbit Monoclonal Antibody
Cat # M03578
Both listed anti-CPEB1 antibodies have Western blot images: A03578 in rat brain lysate and M03578 in four human cell lysates. M03578 shows a band near 70 kDa versus the expected 63 kDa. These images document the tested samples and conditions only.
Which to pick: For rat brain lysate, A03578 has a matching WB image; its listed reactivity also includes human and mouse. For human cell lysates, M03578 has a WB image using A549, K562, SiHa, and U251 cells. Its listed reactivity is human only.
Source: BosterBio CPEB1 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry Q9BZB8.
- Human Protein Atlas. CPEB1 tissue expression.
- PMC10827138 — target-verified WB comparison
- PMC8727934 — target-verified WB comparison
- PMC7684967 — target-verified WB comparison