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SLC1A4 / Neutral amino acid transporter A · Western blot design guide
Design a Western Blot for SLC1A4
Source-linked SLC1A4 Western blot protocol options, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-SLC1A4 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
SLC1A4 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 | ~55.7 kDa | |
| Gel | 12–15% (standard starting point) | |
| Positive control | Adrenal gland (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 | Glycosylated + Phosphorylated | |
| Caveat | Modification-state controls | |
| Gene-set association | MSigDB Hallmark membership | |
| Isoform | 2 isoform(s) |
Section 1
Source-Linked SLC1A4 Western Blot Protocol Options
The PA2186 protocol combines labelled catalog values with standard starting conditions. Published comparisons retain their own sample, reagent and detection scope.
| Sample / lysate | U87, Rat Brain, Mouse Brain (catalog PA2186) |
| 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 | PA2186; 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 SLC1A4 Western Blot Band Size?
SLC1A4 is predicted at 55.7 kDa; glycosylation and isoforms could affect migration, but no empirical band position or feature-specific shift is established.
| Band near 55.7 kDa | consistent with the predicted SLC1A4 mass; confirm identity with controls |
| Band above 55.7 kDa | N-linked glycosylation at Asn201 or Asn206 could affect migration if present |
| Several bands at different positions | isoforms 1 and 2 are documented, but distinct band positions are unverified |
| Weak band in whole-cell lysate | membrane localization may limit recovery |
💡Expected SLC1A4 appearanceSLC1A4 has a predicted mass of 55.7 kDa, but no empirical band size is supplied; glycosylation and isoforms may affect migration, so confirm any candidate band with identity controls.
| Predicted SLC1A4 mass | 55.7 kDa is the sequence-based reference, not a measured band position |
| N-linked glycosylation site Asn201 | glycan occupancy could increase apparent size; the extent is unknown |
| N-linked glycosylation site Asn206 | glycan occupancy could increase apparent size; the extent is unknown |
| Splice isoforms 1 and 2 | their sizes may differ, but relative masses and band separation are unknown |
| Situation | Likely cause | Next action |
|---|---|---|
| No band in lysate | SLC1A4 is a multi-pass membrane protein that may be poorly recovered | check a membrane-enriched fraction and a positive-control lysate |
| Band higher than expected | N-linked glycosylation or an unrelated band may affect the candidate position | compare a validated deglycosylated sample and confirm band identity |
| Broad smear instead of sharp band | variable N-linked glycosylation is possible but unverified | compare matched samples before and after deglycosylation |
| Multiple bands | isoforms 1 and 2 or unrelated antibody binding may contribute | verify bands with an independent antibody or SLC1A4 depletion |
| Weak or no signal | incomplete solubilization of membrane-associated SLC1A4 may reduce recovery | optimize membrane-protein extraction and check a positive control |
Experiment evidence
Western blot images showing SLC1A4 band
PA2186 · SLC1A4
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for SLC1A4 Western blot
🧪HPA-IHC candidate guidance (verify in WB): For positive controls for SLC1A4 in Western blot, you can use adrenal gland lysate, a high-expression HPA tissue.
Positive control: Adrenal gland (IHC candidate; verify WB)
Negative control: Adipose tissue (IHC candidate; verify WB)
Loading controls: Run GAPDH, β-actin, and a total-protein stain such as Ponceau alongside the samples.
⚠️Feasibility: As a multi-pass membrane protein, SLC1A4 may give a stronger signal in membrane-enriched lysate.
HPA tissue expression evidence for SLC1A4
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 |
|---|---|---|---|---|
| Adrenal gland | glandular cells | High | Protein (IHC) | HPA → |
| Appendix | lymphoid tissue | High | Protein (IHC) | HPA → |
| Cerebral cortex | neuropil | High | Protein (IHC) | HPA → |
| Cervix | squamous epithelial cells | High | Protein (IHC) | HPA → |
| Esophagus | squamous epithelial cells | High | 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 → |
| Epididymis | glandular cells | Not detected | Protein (IHC) | HPA → |
| Gallbladder | glandular cells | Not detected | Protein (IHC) | HPA → |
| Liver | cholangiocytes | Not detected | Protein (IHC) | HPA → |
| Lung | alveolar cells | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced SLC1A4 Western Blot Tips
Deeper troubleshooting and optimisation questions for SLC1A4, answered from its protein features.
How should SLC1A4 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.
How could SLC1A4 isoforms affect band interpretation?
Isoforms · UniProt lists isoforms 1 and 2. Isoform 2 lacks canonical residues 1–220 and replaces residues 267–345 with C. It therefore differs substantially from the canonical protein. Check whether the antibody’s target region is retained in the isoform being measured.
Which glycosylation sites should I consider?
PTM · The listed N-linked sites are Asn201 and Asn206 in canonical UniProt numbering. Both lie within the segment missing from isoform 2, so a signal attributed to isoform 2 should not be assigned to these canonical sites. Their presence does not establish a visible band shift.
UniProt lists phosphoserine at canonical positions 507, 527, and 530. It also lists N-acetylmethionine at position 1. Keep these UniProt coordinates explicit when comparing antibody or paper numbering; the listed modifications do not, by themselves, predict separate bands.
UniProt lists phosphoserine at canonical positions 507, 527, and 530. It also lists N-acetylmethionine at position 1. Keep these UniProt coordinates explicit when comparing antibody or paper numbering; the listed modifications do not, by themselves, predict separate bands.
Does this guide establish induction of SLC1A4?
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 SLC1A4?
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 PA2186 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 I quantify SLC1A4 bands?
Quantitation · Specify which band or isoform is being quantified and use the same assignment across samples. SLC1A4 is listed at the cell and melanosome membranes, so comparisons of fractions should account for their different SLC1A4 content. The supplied features provide no empirical band position for choosing a quantitation window.
Why might SLC1A4 migrate differently from its predicted 55.7 kDa?
Interpretation · The 55.7 kDa value is a sequence-based prediction. UniProt lists N-linked glycosylation at Asn201 and Asn206 and phosphorylation at Ser507, Ser527, and Ser530. These features alone do not establish a visible shift or explain any observed mass difference; no empirical band position was supplied.
Consider the two listed isoforms and the reported homotrimer when assessing band identity. Glycosylation and phosphorylation are also listed, but their presence alone does not prove that they produced a particular band. Check the antibody’s target region against each isoform before assigning a signal.
Consider the two listed isoforms and the reported homotrimer when assessing band identity. Glycosylation and phosphorylation are also listed, but their presence alone does not prove that they produced a particular band. Check the antibody’s target region against each isoform before assigning a signal.
Boster reagents
SLC1A4 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-SLC1A4 Antibody Picoband®
Cat # PA2186
The catalog reports PA2186 as an anti-SLC1A4 antibody for Western blotting, with stated human, rat, and mouse reactivity. Its WB image shows U87 cell, rat brain, and mouse brain lysates; these examples do not establish performance in every sample type.
Which to pick: PA2186 is the only listed option. Its WB image includes U87 cell lysate and rat and mouse brain lysates, so those examples are the most direct evidence when planning similar samples.
Source: BosterBio SLC1A4 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry P43007.
- Human Protein Atlas. SLC1A4 tissue expression.
- PMC11824774 — target-verified WB comparison
- PMC11840982 — target-verified WB comparison
- PMC12677694 — target-verified WB comparison