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MC1R · Western blot design guide
Design a Western Blot for MC1R
Real validated MC1R Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-MC1R WB antibodies. Everything you need to plan the experiment before you commit precious samples.
Last reviewed: May 2026 · Scientific review: Boster Bio technical team
MC1R 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 | ~34.7 kDa | |
| Observed band | ~35 kDa | |
| Gel | 10–12% | |
| Negative control | siRNA / KO lysate |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Glycosylated | |
| Caveat | Single N-glycosylation site | |
| Regulation | IFN-γ-induced | |
| Isoform | 1 isoform(s) |
Section 1
Real Curated MC1R Western Blot Protocols
Literature-validated Western blot parameters for MC1R — gel percentage, transfer, blocking, antibody incubation and detection, extracted from published methods.
| Sample / lysate | PC12 , Lane 2: HEPA1-6 , Lane 3: HELA , Lane 4: A375 . After Electrophoresis, proteins were transferred to a Nitrocellulose membrane at 150mA for 50-90 minutes. Blocked the membrane with 5% Non-fat Milk/ TBS for 1.5 hour at RT. The membrane was incubated with rabbit anti-MC1 antigen affinity purified polyclonal antibody (Catalog # A00855-1) at 0.5 μg/mL overnight at 4°C, then washed with TBS-0.1%Tween 3 times with 5 minutes each and probed with a goat anti-rabbit IgG-HRP secondary antibody at a dilution of 1:10000 for 1.5 hour at RT. The signal is developed using an Enhanced Chemiluminescent detection (ECL) kit (Catalog # EK1002) with Tanon 5200 system. A specific band was detected for MC1 at approximately 35KD. The expected band size for MC1 is at 35KD |
| Gel % | 10–12% |
| Load | 50ug |
| 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 |
| Primary incubation | overnight at 4 °C |
| 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 | 35 kDa |
Section 2
What Is the Expected MC1R Western Blot Band Size?
MC1R has a 34.7 kDa predicted backbone but runs at approximately 35 kDa on blots, a modest shift driven mainly by N-glycosylation at Asn29 rather than dimerization or cleavage.
| Single band at approximately 35 kDa | Matches the 34.7 kDa predicted mass of the 317 aa MC1R core, consistent with the empirically observed ~35 kDa band and only modest glycosylation load |
| Band sitting slightly above the 34.7 kDa predicted mass, with a slightly diffuse upper edge | Single N-linked glycosylation site at Asn29 adds mass and minor heterogeneity to the mature receptor |
| High-molecular-weight smear or bands well above 35 kDa (e.g. near 70 kDa or higher) | MC1R is a multi-pass (7-transmembrane) membrane protein that can resist full SDS denaturation, forming aggregates or oligomeric species that migrate anomalously |
| Slight mobility shift between reduced and non-reduced sample lanes, without a doubling of band mass | The single intrachain disulfide bond (Cys267-Cys273) constrains the folded conformation under non-reducing conditions but does not link separate chains, so no true dimer band is expected |
| Weak or absent band in lysates prepared with mild, non-membrane-optimized lysis buffer | As a cell membrane, multi-pass membrane protein, MC1R requires adequate detergent solubilization to be extracted efficiently into the soluble lysate fraction |
💡Expected MC1R appearanceExpect a single band at approximately 35 kDa, consistent with the 34.7 kDa predicted mass plus a modest upward shift from N-glycosylation at Asn29.
| Predicted mass from UniProt | Sets the 34.7 kDa baseline for the 317 aa unmodified polypeptide, close to the ~35 kDa band typically observed |
| N-glycosylation at Asn29 | Adds mass and glycoform heterogeneity, nudging the observed band slightly above the 34.7 kDa predicted mass and broadening it |
| Intrachain disulfide bond (Cys267-Cys273) | Stabilizes the folded conformation and can alter mobility slightly between reduced and non-reduced samples, but does not create a higher-mass dimer band since it is not inter-chain |
| Multi-pass membrane protein / GPCR topology | Can resist complete SDS denaturation, producing higher-molecular-weight aggregate bands or smearing if samples are not adequately solubilized and denatured |
| Bacterial or non-glycosylated recombinant standard | Runs closer to the unmodified 34.7 kDa predicted mass, lower than native glycosylated receptor from mammalian tissue |
| Situation | Likely cause | Next action |
|---|---|---|
| No band in lysate | MC1R is a multi-pass membrane protein that is poorly solubilized by mild lysis buffers, leaving it in the insoluble/membrane pellet fraction | Use a detergent-based lysis buffer suited to membrane proteins and confirm recovery with a membrane-protein loading control |
| Band higher than expected | N-glycosylation at Asn29 or incomplete denaturation of the 7-transmembrane receptor causing residual aggregation | Treat lysate with PNGase F to test for glycan contribution and avoid harsh boiling that can promote GPCR aggregation, using gentler heat denaturation instead |
| Broad smear instead of sharp band | Heterogeneous glycoforms from the single N-linked glycosylation site produce a range of migration speeds | Run a PNGase F-treated control lane alongside untreated lysate to collapse the smear toward the predicted mass |
| Multiple bands | Partial glycosylation states or incomplete reduction of the intrachain disulfide bond generating distinct conformers | Ensure complete reduction with DTT or beta-mercaptoethanol and compare with a deglycosylated control to identify glyco-dependent bands |
| Weak or no signal | MC1R is expressed at low levels outside melanocyte-lineage cells, limiting detectable protein in unrelated lysates | Include a melanocyte-lineage or melanoma cell line lysate as a positive control and increase total protein loaded |
Experiment evidence
Western blot images showing MC1R band
A00855-1 · MC1R
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for MC1R Western blot
🧪For positive controls for MC1R in Western blot, you can use melanocyte or melanoma-derived cell lines, which are the principal known sites of MC1R expression.
Positive control: Melanocytes
Negative control: ubiquitously expressed; use siRNA knockdown or KO line
Loading controls: Run GAPDH, β-actin, and a total-protein stain (e.g. stain-free gel, Ponceau S, or REVERT) as loading controls.
⚠️Feasibility: HPA has no expression data for MC1R, and as a melanocyte-restricted multi-pass membrane GPCR it lacks a clear tissue-level negative, so confirm antibody specificity with an siRNA knockdown or knockout cell line rather than relying on tissue selection alone.
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 |
|---|
Undetected expression · recommended negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|
Section 3
Advanced MC1R Western Blot Tips
Deeper troubleshooting and optimisation questions for MC1R, answered from its protein features.
Does the observed MC1R band match its predicted mass?
Predicted mass is 34.7 kDa and the observed band runs at approximately 35 kDa, an essentially exact match. MC1R carries only one N-glycosylation site, which adds minimal mass, so no substantial shift is expected. A band near 35 kDa on reducing SDS-PAGE is consistent with the UniProt-predicted sequence.
Why does MC1R usually appear as a single band?
UniProt lists only one isoform for MC1R, so a single specific band near 35 kDa is expected. Extra bands are more likely explained by degradation, incomplete denaturation, or nonspecific antibody binding than by isoform variation, since no alternative isoforms are annotated for this receptor.
How is MC1R signaling activity regulated?
MC1R is a G-protein-coupled receptor that transduces signal via Gs to raise cAMP upon agonist binding. MGRN1 interaction competes with GNAS binding and inhibits agonist-induced cAMP production without triggering MGRN1-mediated ubiquitination. Because this regulation is functional rather than expression-based, cAMP assays, not band intensity, best report MC1R activity state.
How should blocking be optimized for MC1R detection?
MC1R has one annotated N-glycosylation site, so glycoprotein-rich blockers such as milk can introduce lectin-like background on the blot. A BSA-based blocking buffer is preferable for cleaner signal. Always run a no-primary-antibody control to confirm background is blocker-related rather than antibody cross-reactivity.
What transfer method to use for MC1R Western blot?
MC1R is a multi-pass, seven-transmembrane membrane protein and highly hydrophobic, so use wet transfer with reduced methanol (around 10%) or semi-dry transfer with SDS added to the buffer to aid elution from the gel. Avoid excessive heating before loading, which can promote aggregation of the transmembrane helices.
Which loading control fits MC1R quantitation?
Since MC1R is localized to the cell membrane, normalize band intensity to a membrane-associated loading control, such as Na+/K+-ATPase, rather than a cytosolic marker like GAPDH. This ensures the control reflects membrane protein recovery and loading consistency across lanes rather than total cellular protein.
What explains higher-molecular-weight MC1R bands?
MC1R has one disulfide bond and is a multi-pass membrane protein prone to SDS-resistant aggregation. Non-reducing conditions or incomplete denaturation can produce higher-molecular-weight bands from dimers or aggregates rather than true isoforms. Always include a reducing agent and avoid excessive boiling to minimize this artifact.
Boster reagents
Best MC1R Western Blot Antibodies
BosterBio's MC1R 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-MC1 Receptor/MC1R Antibody Picoband®
Cat # A00855-1
Our recommended anti-MC1R Western blot antibodies are top-performing reagents, widely cited in the literature, and rigorously validated through orthogonal approaches including negative-tissue controls and complementary detection methods, ensuring reliable, specific, reproducible MC1R detection.
Which to pick: Only one Boster MC1R antibody is listed, A00855-1, and it includes an actual Western blot validation image, making it the clear, straightforward choice for your MC1R Western blot experiments.
Source: BosterBio MC1R gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry Q01726.
- Human Protein Atlas. MC1R tissue expression.