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- Table of Contents
COL5A1 / Collagen alpha-1(V) chain · Western blot design guide
Design a Western Blot for COL5A1
Real validated COL5A1 Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-COL5A1 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
COL5A1 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 | ~183.6 kDa | |
| Gel | 8–10% (standard starting point) | |
| Negative control | Suggested KO / knockdown lysate |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Cleaved | |
| Caveat | Processing-state controls | |
| Gene-set association | MSigDB Hallmark membership | |
| Isoform | 2 isoform(s) |
Section 1
Real Curated COL5A1 Western Blot Protocols
The A02283-1 protocol combines labelled catalog values with standard starting conditions. Published comparisons retain their own sample, reagent and detection scope.
| Sample / lysate | C6 (40ug), CT26 (40ug), U-87MG (40ug) (catalog A02283-1) |
| Gel % | 8–10% (standard starting point) |
| Load | 20–30 µg total protein per lane; optimize for abundance (standard starting point) |
| Transfer | Wet/tank transfer; optimize duration (standard starting point) |
| Membrane | 0.45 µm PVDF (standard starting point) |
| Blocking | 5% milk or 5% BSA in TBST (standard starting point) |
| Primary antibody | A02283-1; 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 COL5A1 Western Blot Band Size?
COL5A1 has a predicted 183.6 kDa precursor; processing and chain association could affect migration, but no empirical band size demonstrates their effects.
| Band near 183.6 kDa | Compatible with the predicted full-length precursor; confirm identity with controls |
| Band below 183.6 kDa | May reflect signal-peptide or C-terminal propeptide cleavage |
| Higher band under non-reducing conditions | May reflect retained collagen chain association |
| Little or no band in whole-cell lysate | COL5A1 is secreted into the extracellular matrix |
| Several bands at different positions | May reflect processing or isoforms 1 and 2; distinct isoform migration is unproven |
💡Expected COL5A1 appearanceUniProt predicts a 183.6 kDa full-length precursor; secretion, processing and chain association may alter the band seen, but no empirical band size is supplied, so confirm identity with appropriate controls.
| UniProt full-length precursor mass | Predicts 183.6 kDa before processing |
| Signal peptide at residues 1–37 | Cleavage can reduce the mature chain's mass |
| C-terminal propeptide at residues 1606–1838 | Cleavage can reduce the mature chain's mass |
| Isoforms 1 and 2 | May differ in size; their masses and migration are unspecified |
| Disulfides in collagen trimers | Retained chain association may produce a higher band under non-reducing conditions |
| Situation | Likely cause | Next action |
|---|---|---|
| No band in lysate | COL5A1 is secreted into the extracellular matrix | Check conditioned medium or extracellular matrix fractions with a positive control |
| Band higher than expected | Collagen chains may remain associated under non-reducing or incomplete reduction conditions | Compare reducing and non-reducing samples and verify band identity |
| Band lower than expected | Signal-peptide or C-terminal propeptide cleavage may reduce chain mass | Check whether the antibody recognizes the retained region and compare precursor and processed samples |
| Multiple bands | Processing or isoforms 1 and 2 may contribute | Compare samples and verify each band's identity with an independent antibody or knockdown |
| Weak or no signal | Secreted COL5A1 may be scarce in the tested fraction | Test an extracellular matrix fraction alongside a positive control |
| Fragments below expected size | Propeptide cleavage or further proteolysis may produce shorter species | Verify antibody epitope and compare sample preparation conditions |
Experiment evidence
Western blot images showing COL5A1 band
A02283-1 · COL5A1
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for COL5A1 Western blot
🧪For positive controls for COL5A1 in Western blot, you can use no HPA-supported positive sample because none is supplied.
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: COL5A1 is secreted into the extracellular matrix, so whole-cell lysate may yield little signal.
HPA tissue expression evidence for COL5A1
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 COL5A1 Western Blot Tips
Deeper troubleshooting and optimisation questions for COL5A1, answered from its protein features.
How should COL5A1 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.
Could COL5A1 isoforms produce different bands?
Isoforms · UniProt lists two isoforms. Isoform 2 replaces residues 1690..1711 within the annotated propeptide. Check whether the antibody recognizes that region and whether the sample contains the propeptide before assigning separate bands to isoforms. The sequence change alone does not establish a visible shift.
Which modifications matter when interpreting COL5A1 bands?
PTM · UniProt annotates sulfotyrosines at 234, 236, 240, 262, 263, 338, 340, 346, 347, 416, 417, 420, 421, 1601 and 1604, plus numerous hydroxyproline and 5-hydroxylysine sites. These are UniProt sequence coordinates; antibody or paper numbering may differ. Their presence does not establish a visible band shift.
Does this guide establish induction of COL5A1?
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 COL5A1?
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 A02283-1 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 COL5A1 bands be quantified across samples?
Quantitation · Quantify the same defined band or band set from the same sample fraction and preparation conditions across samples. COL5A1 is secreted, occupies the extracellular matrix, and has annotated signal-peptide and propeptide regions; different fractions or processing states could change what an antibody detects. Report the quantified species rather than treating every COL5A1-reactive band as equivalent.
Why might COL5A1 migrate away from 183.6 kDa?
Interpretation · 183.6 kDa is the predicted mass of the 1838-residue precursor. UniProt annotates a signal peptide at 1..37 and a propeptide at 1606..1838, so processing may change the detected species. The supplied features alone cannot predict the apparent band position or explain a measured difference.
COL5A1 is annotated as secreted and located in the extracellular matrix. Include an appropriate extracellular or matrix-containing fraction when assessing detection, and compare the same fraction across samples. A weak cellular-lysate signal alone does not establish low total COL5A1 abundance.
First check the antibody epitope against the signal peptide at 1..37 and propeptide at 1606..1838. Processing could change which species retain that epitope. UniProt also lists two isoforms and five disulfide bonds. Band size alone cannot identify a species; the supplied record provides no observed band position.
Yes. UniProt annotates five disulfide bonds and describes COL5A1 in collagen V trimers. Compare matched reducing and nonreducing preparations if multiple species appear, and record which condition produced each band. These features do not establish that any particular band is a trimer or disulfide-linked species.
COL5A1 is annotated as secreted and located in the extracellular matrix. Include an appropriate extracellular or matrix-containing fraction when assessing detection, and compare the same fraction across samples. A weak cellular-lysate signal alone does not establish low total COL5A1 abundance.
First check the antibody epitope against the signal peptide at 1..37 and propeptide at 1606..1838. Processing could change which species retain that epitope. UniProt also lists two isoforms and five disulfide bonds. Band size alone cannot identify a species; the supplied record provides no observed band position.
Yes. UniProt annotates five disulfide bonds and describes COL5A1 in collagen V trimers. Compare matched reducing and nonreducing preparations if multiple species appear, and record which condition produced each band. These features do not establish that any particular band is a trimer or disulfide-linked species.
Boster reagents
COL5A1 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-COL5A1 (E325) Antibody
Cat # A02283-1
A02283-1 is an anti-COL5A1 antibody listed for human, mouse, and rat. Its WB image shows C6, CT26, U-87MG, and HeLa whole-cell lysates at 40 µg per lane, using a 1:500 antibody dilution. These examples do not establish performance in every sample.
Which to pick: A02283-1 is the only listed option. Check its stated reactivity against your species and compare your sample with the four lysates shown in its WB image.
Source: BosterBio COL5A1 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry P20908.
- Human Protein Atlas. COL5A1 tissue expression.
- PMC8786464 — target-verified WB comparison
- PMC9075584 — target-verified WB comparison
- PMC6369854 — target-verified WB comparison