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CD248 · Western blot design guide
Design a Western Blot for CD248
Real validated CD248 Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-CD248 WB antibodies. Everything you need to plan the experiment before you commit precious samples.
Last reviewed: May 2026 · Scientific review: Boster Bio technical team
CD248 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 | ~80.9 kDa | |
| Gel | 8–10% | |
| Positive control | Duodenum+4 more · see all | |
| Negative control | Adipose tissue+4 more · see all |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Glycosylated + Phosphorylated | |
| Caveat | Heavy O-glycosylation | |
| Regulation | LPS-induced | |
| Isoform | 2 isoform(s) |
Section 1
Real Curated CD248 Western Blot Protocols
Literature-validated Western blot parameters for CD248 — gel percentage, transfer, blocking, antibody incubation and detection, extracted from published methods.
| Gel % | 8–10% |
| 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 |
| Secondary antibody | goat anti-rabbit IgG-HRP, 1:10000 |
| Wash | TBS-0.1% Tween, 3 × 5 min |
| Detection | ECL |
| Exposure / imaging | Tanon 5200 |
| Observed band | 25 kDa |
Section 2
What Is the Expected CD248 Western Blot Band Size?
CD248/Endosialin has an 80.9 kDa predicted backbone but runs higher and broader on blots mainly due to extensive O-linked glycosylation across 27 sites.
| band above the 80.9 kDa predicted mass | reflects mass added by extensive O-linked glycosylation at up to 27 sites |
| broad or smeared band rather than a sharp line | heterogeneous glycoform occupancy across the 27 O-glycosylation sites |
| band slightly below the unprocessed precursor size | N-terminal signal peptide (residues 1-17) has been cleaved to generate the mature membrane protein |
| two bands at different molecular weights | co-expression of isoform 1 and isoform 2 arising from alternative splicing |
| faint or absent band in a standard soluble lysate prep | single-pass type I membrane protein that is not efficiently solubilized without adequate detergent |
| slight mobility shift between reduced and non-reduced samples | intrachain disulfide bonds stabilize a compact fold that migrates differently without reduction |
💡Expected CD248 appearanceCD248/Endosialin typically appears as a broad band above its 80.9 kDa predicted mass, reflecting signal-peptide cleavage and heavy O-linked glycosylation at up to 27 sites, sometimes with a second isoform band.
| Predicted mass (UniProt) | 80.9 kDa backbone before any modification; the observed band typically runs above this |
| O-linked glycosylation (27 sites, e.g. Thr60, Thr401, Thr428) | adds substantial mass and heterogeneity, shifting the band well above 80.9 kDa and broadening it into a smear |
| Signal peptide cleavage (residues 1-17) | removes the N-terminal leader from the precursor, so the mature membrane-bound form runs slightly lower than the unprocessed translation product |
| Alternative splicing (isoforms 1 and 2) | can generate an additional band at a different apparent size distinct from the canonical isoform |
| Intrachain disulfide bonds (4 pairs in EGF-like/lectin domains) | stabilize a compact folded structure, so non-reduced samples may migrate slightly faster than fully reduced samples despite no true increase in mass |
| Situation | Likely cause | Next action |
|---|---|---|
| Band higher than expected | extensive O-linked glycosylation across 27 sites adds substantial mass to the mature protein | treat lysate with a deglycosylation enzyme and compare mobility shift toward the 80.9 kDa predicted mass |
| Broad smear instead of sharp band | heterogeneous occupancy of the 27 O-glycosylation sites produces a ladder of glycoforms | run a lower-percentage or gradient gel for longer to better resolve the smear, or deglycosylate before loading |
| Multiple bands | isoform 1 and isoform 2 arise from alternative splicing and can co-migrate as separate species | check which isoform the antibody epitope targets and confirm band assignment against isoform sequence differences |
| Band lower than expected | cleavage of the residues 1-17 signal peptide removes mass relative to the unprocessed precursor | confirm whether the predicted mass used for comparison is for the full-length precursor or the cleaved mature protein |
| Weak or no signal | single-pass type I membrane protein is poorly extracted by lysis buffers that do not adequately solubilize membrane proteins | use a detergent-based lysis buffer suited to membrane protein extraction and avoid excessive sample heating before loading |
Experiment evidence
Western blot images showing CD248 band
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for CD248 Western blot
🧪For positive controls for CD248 in Western blot, you can use duodenum tissue lysate, which shows high expression by immunohistochemistry.
Positive control: Duodenum
Negative control: Adipose tissue
Loading controls: Run GAPDH and β-actin antibodies alongside a total-protein stain (e.g., stain-free gel, Ponceau S, or REVERT) as loading controls.
⚠️Feasibility: As a single-pass type I membrane protein, CD248 needs a detergent-based lysis buffer for efficient membrane extraction, though a clean negative tissue (adipose) is available to confirm antibody specificity.
HPA tissue expression evidence for CD248
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 |
|---|---|---|---|---|
| Duodenum | paneth cells | High | Protein (IHC) | HPA → |
| Rectum | fibroblasts | High | Protein (IHC) | HPA → |
| Skin | extracellular matrix | High | Protein (IHC) | HPA → |
| Small intestine | paneth cells | High | Protein (IHC) | HPA → |
| Appendix | germinal center cells | Medium | Protein (IHC) | HPA → |
Undetected expression · recommended 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 → |
| Bone marrow | hematopoietic cells | Not detected | Protein (IHC) | HPA → |
| Breast | adipocytes | Not detected | Protein (IHC) | HPA → |
| Bronchus | respiratory epithelial cells | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced CD248 Western Blot Tips
Deeper troubleshooting and optimisation questions for CD248, answered from its protein features.
Why does CD248 run higher than its 80.9 kDa predicted mass?
CD248 carries 27 predicted N-glycosylation sites; glycan mass adds substantially to the 80.9 kDa calculated backbone, so the apparent band typically runs well above 80.9 kDa. This shift reflects glycosylation, not aberrant specificity — deglycosylation (e.g., PNGase F) treatment on a parallel sample should shift the band back toward the predicted mass.
Does CD248 have splice isoforms affecting the blot?
UniProt lists two annotated isoforms (1 and 2) generated by alternative splicing. Depending on which region your antibody targets, only one isoform may be detected, or both may appear as a doublet with slightly different apparent masses. Confirm your antibody's immunogen sequence maps to the isoform(s) you expect before interpreting band number.
Can phosphorylation cause a CD248 mobility shift?
CD248 has one annotated modified residue consistent with phosphorylation. Phosphorylated species can migrate slightly slower on SDS-PAGE, producing a minor upward shift or a faint secondary band near the main species. Phosphatase treatment of a parallel lysate sample can help confirm whether an extra band reflects phosphorylation rather than a distinct isoform or degradation product.
Should I avoid milk-based blocking buffers for CD248?
CD248 is heavily glycosylated (27 predicted sites) and is annotated as a lectin, meaning it can bind carbohydrate structures. Milk-based blockers are rich in glycoproteins that this domain may bind non-specifically, raising background. A BSA-based blocking buffer is a safer default to avoid lectin-mediated non-specific binding on CD248 blots.
What transfer method to use for CD248 Western blot?
CD248 is a large (80.9 kDa predicted, higher with glycosylation), single-pass type I transmembrane glycoprotein. Wet/tank transfer is preferred over semi-dry for this high-molecular-weight, heavily modified protein; extend transfer time and include 10-20% methanol to aid transfer of the hydrophobic transmembrane region while preventing pore closure in the gel.
How do disulfide bonds affect CD248 sample prep?
CD248 contains four disulfide bonds. Always run samples under reducing conditions (DTT or beta-mercaptoethanol) to break these bonds and linearize the protein; non-reducing conditions can cause aberrant migration, smearing, or inflated apparent mass from incompletely denatured, disulfide-stabilized conformations that complicate accurate quantitation.
What explains extra high-molecular-weight CD248 bands?
CD248 interacts with PDGFRA, integrin beta-1 (ITGB1), and the insulin receptor. Incomplete denaturation or insufficient reducing agent can leave these complexes intact, producing high-molecular-weight bands above the monomer. Ensure thorough boiling and reduction, and consider that co-migrating partner proteins may also react with poorly validated antibodies near CD248's expected mass.
Boster reagents
Best CD248 Western Blot Antibodies
BosterBio's CD248 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-ESM1 Antibody Picoband®
Cat # A04169-1
Our recommended CD248 Western blot antibodies are top-performing, extensively cited in the literature, and rigorously validated, with specificity confirmed through negative-tissue controls and orthogonal, complementary detection methods, giving you dependable, reproducible results for confident CD248 protein detection and expression analysis.
Which to pick: Only one anti-CD248 antibody is catalogued here, A04169-1, which includes an actual Western blot validation image, so it's the clear and only choice from this list for your CD248 blotting experiments.
Source: BosterBio CD248 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry Q9HCU0.
- Human Protein Atlas. CD248 tissue expression.