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- Table of Contents
RAC2 / Ras-related C3 botulinum toxin substrate 2 · Western blot design guide
Design a Western Blot for RAC2
Real validated RAC2 Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-RAC2 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
RAC2 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 | ~21.4 kDa | |
| Gel | 12–15% (standard starting point) | |
| Positive control | Bone marrow (IHC candidate; verify WB) +4 more | |
| Negative control | Cervix (IHC candidate; verify WB) |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | PAU_02230-dependent Glycosylated + Acetylated | |
| Caveat | Modification-state controls | |
| Gene-set association | MSigDB Hallmark membership | |
| Isoform | 1 isoform(s) |
Section 1
Real Curated RAC2 Western Blot Protocols
The A01714 protocol combines labelled catalog values with standard starting conditions. Published comparisons retain their own sample, reagent and detection scope.
| Sample / lysate | Jurkat, sp2/0, H9C2 (catalog A01714) |
| 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 | A01714; 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 RAC2 Western Blot Band Size?
Full-length RAC2 is predicted at 21.4 kDa; propeptide cleavage and conditional Tyr32 O-GlcNAc are possible features, but their effects on migration are unverified.
| Band near 21.4 kDa | consistent with the predicted full-length RAC2 mass; confirm identity with controls |
| Band slightly below 21.4 kDa | could reflect removal of the 190–192 propeptide; identity needs confirmation |
| No clear mobility shift | compatible with the conditional single O-GlcNAc modification at Tyr32 |
| Weak band in a soluble fraction | activated RAC2 may be membrane-associated |
💡Expected RAC2 appearanceUniProt predicts 21.4 kDa for full-length RAC2; no empirical band size is supplied, and band identity should be checked with an appropriate positive sample and RAC2 depletion control.
| Full-length predicted mass | sets a 21.4 kDa reference, not a validated migration position |
| Full-length precursor | retains residues 190–192 and should be slightly larger than the cleaved form |
| Propeptide cleavage at 190–192 | removes three residues, with no demonstrated resolvable shift |
| Conditional O-GlcNAc at Tyr32 | occurs through Photorhabdus PAU_02230; a visible shift is not established |
| Situation | Likely cause | Next action |
|---|---|---|
| No band in lysate | activated RAC2 may be membrane-associated | check a membrane-enriched fraction and a positive sample |
| Band higher than expected | band identity or migration cause is unestablished | compare with a RAC2-depleted control |
| Band lower than expected | cleavage of residues 190–192 could slightly reduce mass | check identity with RAC2 depletion; investigate larger differences separately |
| Multiple bands | the supplied features do not establish resolvable RAC2 forms | use RAC2 depletion to identify specific bands |
| Weak or no signal | RAC2 may be missed if activated protein partitions with membranes | check extraction of the membrane fraction and include a positive sample |
| Fragments below expected size | removal of three propeptide residues does not establish small RAC2 fragments | check sample integrity and confirm fragment identity with RAC2 depletion |
Experiment evidence
Western blot images showing RAC2 band
A01714 · RAC2
A01714-1 · RAC2
A01714-1 · RAC2
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for RAC2 Western blot
🧪HPA-IHC candidate guidance (verify in WB): For positive controls for RAC2 in Western blot, you can use bone marrow lysate.
Positive control: Bone marrow (IHC candidate; verify WB)
Negative control: Cervix (IHC candidate; verify WB)
Loading controls: Run GAPDH, β-actin, and a total-protein stain such as Ponceau alongside the samples.
⚠️Feasibility: Tissue lysates are suitable for cytoplasmic RAC2, although activated RAC2 can associate with membranes.
HPA tissue expression evidence for RAC2
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 |
|---|---|---|---|---|
| Bone marrow | hematopoietic cells | Medium | Protein (IHC) | HPA → |
| Lymph node | non-germinal center cells | Medium | Protein (IHC) | HPA → |
| Skin | fibroblasts | Medium | Protein (IHC) | HPA → |
| Soft tissue | chondrocytes | Medium | Protein (IHC) | HPA → |
| Spleen | cells in white pulp | Medium | Protein (IHC) | HPA → |
Lower expression tissues · IHC evidence, not confirmed WB-negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Cervix | glandular cells | Not detected | Protein (IHC) | HPA → |
| Colon | endothelial cells | Not detected | Protein (IHC) | HPA → |
| Duodenum | glandular cells | Not detected | Protein (IHC) | HPA → |
| Endometrium | cells in endometrial stroma | Not detected | Protein (IHC) | HPA → |
| Epididymis | glandular cells | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced RAC2 Western Blot Tips
Deeper troubleshooting and optimisation questions for RAC2, answered from its protein features.
How should RAC2 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 RAC2 isoforms explain multiple bands?
Isoforms · Only one isoform is listed, with no alternative sequence supplied. These features do not support assigning additional bands to RAC2 isoforms; check band identity before interpreting them.
Which RAC2 modifications matter when interpreting a blot?
PTM · UniProt lists ADP-ribosylasparagine at position 39, N6-acetyllysine at 147, cysteine methyl ester at 189, and O-linked GlcNAc on tyrosine 32. These are UniProt coordinates and may differ from paper or antibody numbering. None alone demonstrates a visible band shift.
Botulinum toxin is listed for ADP-ribosylation at UniProt position 39; Photorhabdus PAU_02230 is listed for O-linked GlcNAc at tyrosine 32. Compare treated and matched untreated samples if testing those modifications. The supplied features do not establish that either treatment changes band intensity or migration.
Botulinum toxin is listed for ADP-ribosylation at UniProt position 39; Photorhabdus PAU_02230 is listed for O-linked GlcNAc at tyrosine 32. Compare treated and matched untreated samples if testing those modifications. The supplied features do not establish that either treatment changes band intensity or migration.
Does this guide establish induction of RAC2?
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 RAC2 Western blot?
Transfer · RAC2 is a small, predicted 21.4 kDa protein. A 0.2 µm membrane is a practical starting point for retaining it; check transfer and adjust conditions if signal is lost. The supplied features do not identify a validated transfer method.
How should blocking be optimized?
Blocking · Standard workflow guidance: follow the A01714 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 RAC2 be quantified across cell fractions?
Quantitation · RAC2 is cytoplasmic and becomes membrane-associated when activated. If comparing conditions, quantify matched fractions with consistent loading and consider both cytoplasmic and membrane signals; a change in one fraction may reflect redistribution.
Why might RAC2 migrate differently from its predicted mass?
Interpretation · RAC2 is predicted at 21.4 kDa, but no observed band size is supplied. Its listed modifications and propeptide at UniProt positions 190–192 are factors to consider; their presence alone does not establish a visible shift or explain a mass difference.
Start with the predicted 21.4 kDa size, then verify band identity. One isoform is listed, while several modifications and a propeptide at UniProt positions 190–192 are annotated. Those features alone cannot identify an extra band or establish its cause.
Start with the predicted 21.4 kDa size, then verify band identity. One isoform is listed, while several modifications and a propeptide at UniProt positions 190–192 are annotated. Those features alone cannot identify an extra band or establish its cause.
Boster reagents
RAC2 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-RAC2 Antibody
Cat # A01714
Real WB data
Anti-RAC2 Antibody
Cat # A01714-1
Both listed anti-RAC2 antibodies report human, mouse, and rat reactivity and have WB images. A01714 shows Jurkat, sp2/0, and H9C2 cell lysates; A01714-1 shows mouse spleen extract. These examples document specific tested samples, not comprehensive validation.
Which to pick: Choose A01714 for a starting point with the pictured cell lysates at 1:500, or A01714-1 for mouse spleen extract at 1:1000. Both have WB images and the same listed reactivity; match the reported sample and conditions to your experiment.
Source: BosterBio RAC2 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry P15153.
- Human Protein Atlas. RAC2 tissue expression.
- PMC11841323 — target-verified WB comparison
- PMC5635268 — target-verified WB comparison
- PMC2767303 — target-verified WB comparison