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- Table of Contents
MRAS / Ras-related protein M-Ras · Western blot design guide
Design a Western Blot for MRAS
Source-linked MRAS Western blot protocol options, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-MRAS 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
MRAS 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 | ~23.8 kDa | |
| Gel | 12–15% (standard starting point) | |
| Positive control | Adipose tissue (IHC candidate; verify WB) +4 more | |
| Negative control | Soft tissue (IHC candidate; verify WB) |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Methylated + Cleaved | |
| Caveat | Modification-state controls | |
| Gene-set association | MSigDB Hallmark membership | |
| Isoform | 2 isoform(s) |
Section 1
Source-Linked MRAS Western Blot Protocol Options
The M06332-1 protocol combines labelled catalog values with standard starting conditions. Published comparisons retain their own sample, reagent and detection scope.
| Sample / lysate | HeLa cell lysate (catalog M06332-1) |
| Gel % | 12–15% (standard starting point) |
| Load | 20–30 µg total protein per lane; optimize for abundance (standard starting point) |
| Transfer | Short semi-dry transfer; verify retention (standard starting point) |
| Membrane | 0.45 µm PVDF (standard starting point) |
| Blocking | 5% milk or 5% BSA in TBST (standard starting point) |
| Primary antibody | M06332-1; 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 MRAS Western Blot Band Size?
MRAS has a predicted 23.8 kDa precursor; propeptide cleavage and isoforms could affect migration, but no empirical band or demonstrated migration effect is supplied.
| Band near 23.8 kDa | Consistent with the predicted MRAS precursor size; confirm identity with controls |
| Band slightly below 23.8 kDa | Could reflect removal of the three-residue C-terminal propeptide |
| More than one nearby band | Isoforms 1 and 2 could contribute, but their migration is unknown |
| Faint or absent band in a soluble lysate fraction | MRAS is anchored to the cytoplasmic side of the cell membrane |
💡Expected MRAS appearanceUniProt predicts a 23.8 kDa precursor; propeptide cleavage or alternative splicing could affect migration, but no empirical band size or distinct isoform pattern is supplied, so confirm any band with identity controls.
| UniProt predicted mass | Places the precursor near 23.8 kDa |
| 208-residue precursor | Includes the C-terminal propeptide in the predicted size |
| C-terminal propeptide at residues 206–208 | Its removal could make the mature protein slightly smaller than the precursor |
| Splice isoforms 1 and 2 | Could differ in size; their relative masses and migration are unknown |
| Situation | Likely cause | Next action |
|---|---|---|
| No band in lysate | Membrane-associated MRAS may be poorly recovered | Check membrane protein recovery and use a positive control |
| Band higher than expected | Its identity and cause of migration are unestablished | Compare with a positive control and verify antibody specificity |
| Band lower than expected | C-terminal propeptide removal could cause a small decrease | Check band identity with a positive control; investigate larger differences separately |
| Multiple bands | Isoforms 1 and 2 are annotated, but distinct bands are unproven | Compare with isoform-specific controls or validate each band independently |
| Weak or no signal | Membrane-associated MRAS may be underrepresented in the preparation | Check extraction and loading of the membrane fraction |
Experiment evidence
Western blot images showing MRAS band
M06332-1 · MRAS
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for MRAS Western blot
🧪HPA-IHC candidate guidance (verify in WB): For positive controls for MRAS in Western blot, you can use adipose tissue lysate, based on high HPA expression.
Positive control: Adipose tissue (IHC candidate; verify WB)
Negative control: Soft tissue (IHC candidate; verify WB)
Loading controls: Run GAPDH, β-actin, and a total-protein stain such as Ponceau alongside the samples.
⚠️Feasibility: MRAS is membrane-anchored, so membrane-enriched lysate may improve detection.
HPA tissue expression evidence for MRAS
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 |
|---|---|---|---|---|
| Adipose tissue | adipocytes | High | Protein (IHC) | HPA → |
| Adrenal gland | glandular cells | High | Protein (IHC) | HPA → |
| Bronchus | respiratory epithelial cells | High | Protein (IHC) | HPA → |
| Colon | glandular cells | High | Protein (IHC) | HPA → |
| Duodenum | glandular cells | High | Protein (IHC) | HPA → |
Lower expression tissues · IHC evidence, not confirmed WB-negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Soft tissue | fibroblasts | Not detected | Protein (IHC) | HPA → |
| Lung | alveolar cells | Low | Protein (IHC) | HPA → |
| Ovary | ovarian stroma cells | Low | Protein (IHC) | HPA → |
| Appendix | glandular cells | Medium | Protein (IHC) | HPA → |
| Bone marrow | hematopoietic cells | Medium | Protein (IHC) | HPA → |
Section 3
Advanced MRAS Western Blot Tips
Deeper troubleshooting and optimisation questions for MRAS, answered from its protein features.
How should MRAS 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 MRAS isoforms produce different bands?
Isoforms · UniProt lists two isoforms. Isoform 2 lacks residues 1..76 relative to the canonical sequence, so it may migrate below isoform 1. Check whether the antibody recognizes a region retained in isoform 2 before assigning a lower band to it.
Which MRAS modification matters when interpreting a band?
PTM · UniProt identifies a cysteine methyl ester at canonical position 205 and lists a 206..208 propeptide. Its lipid-anchor location and prenylation keyword also indicate membrane association. These annotations do not establish a resolvable band shift. Keep the UniProt coordinate convention explicit when comparing antibody or paper numbering.
Does this guide establish induction of MRAS?
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.
What transfer method to use for MRAS Western blot?
Transfer · MRAS is a small protein with a predicted mass of 23.8 kDa. Choose transfer conditions and a membrane that retain proteins near that size, then verify transfer and retention with a suitable control. Its lipid-anchor annotation also makes consistent membrane-protein recovery relevant before transfer.
How should blocking be optimized?
Blocking · Standard workflow guidance: follow the M06332-1 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 MRAS be quantified across samples?
Quantitation · MRAS is annotated on the cytoplasmic side of the cell membrane with a lipid anchor. Keep sample preparation and membrane-protein recovery consistent, and compare MRAS against an appropriate loading reference in the same sample fraction. Its participation in a GTP-bound SHOC2-MRAS-PP1c complex does not by itself measure total MRAS abundance.
Should MRAS migrate at its predicted 23.8 kDa?
Interpretation · Use 23.8 kDa as the canonical sequence reference, not an exact band position. UniProt lists a 206..208 propeptide and a cysteine methyl ester at position 205, but these features alone do not establish a visible shift. No empirical band position was supplied.
Consider the isoform 2 deletion of canonical residues 1..76 and the annotated 206..208 propeptide when reviewing band positions. The position-205 cysteine methyl ester does not, by itself, explain a distinct band. With no observed band position supplied, assign band identities only after checking antibody recognition and sample-specific evidence.
Consider the isoform 2 deletion of canonical residues 1..76 and the annotated 206..208 propeptide when reviewing band positions. The position-205 cysteine methyl ester does not, by itself, explain a distinct band. With no observed band position supplied, assign band identities only after checking antibody recognition and sample-specific evidence.
Boster reagents
MRAS 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-Mras Rabbit Monoclonal Antibody
Cat # M06332-1
The catalog reports one anti-MRAS antibody, M06332-1, a rabbit monoclonal with stated human, mouse, and rat reactivity. Its Western blot image shows MRAS expression in HeLa cell lysate; the supplied evidence does not show Western blots in other samples.
Which to pick: M06332-1 is the only listed option and has a Western blot image using HeLa cell lysate. Its catalog lists human, mouse, and rat reactivity, but the supplied image documents only the HeLa sample context.
Source: BosterBio MRAS gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry O14807.
- Human Protein Atlas. MRAS tissue expression.
- PMC10851011 — target-verified WB comparison
- PMC11576691 — target-verified WB comparison
- PMC9694338 — target-verified WB comparison