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- Table of Contents
RAB32 / Ras-related protein Rab-32 · Western blot design guide
Design a Western Blot for RAB32
Source-linked RAB32 Western blot protocol options, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-RAB32 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
RAB32 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 | ~25 kDa | |
| Gel | 12–15% (standard starting point) | |
| Positive control | Adipose tissue (IHC candidate; verify WB) +4 more | |
| Negative control | Caudate (IHC candidate; verify WB) |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Phosphorylated + Acetylated | |
| Caveat | Modification-state controls | |
| Gene-set association | MSigDB C7 membership | |
| Isoform | 1 isoform(s) |
Section 1
Source-Linked RAB32 Western Blot Protocol Options
The A04645 protocol combines labelled catalog values with standard starting conditions. Published comparisons retain their own sample, reagent and detection scope.
| Sample / lysate | Target-positive lysate and matched negative control (standard starting point) |
| 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 | A04645; 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 RAB32 Western Blot Band Size?
RAB32 is predicted at about 25 kDa; phosphorylation and membrane anchoring are documented, but their effects on band migration are not demonstrated.
| Band near 25 kDa | Consistent with the predicted RAB32 mass; confirm identity with appropriate controls |
| Weak band in a soluble fraction | Consistent with RAB32 association with mitochondrial and vesicle membranes |
| Band enriched in a membrane fraction | Consistent with RAB32 membrane localization and lipid anchoring |
| Additional nearby band | Could reflect a modified state such as phosphorylation at Ser71; identity requires confirmation |
💡Expected RAB32 appearanceUniProt predicts RAB32 at about 25 kDa; no empirical band size is supplied, so confirm any candidate band with RAB32 depletion and fractionation controls.
| UniProt predicted mass | Places the expected RAB32 band near 25 kDa |
| N-acetylalanine at residue 2 | Is documented, but no visible size change is established |
| Phosphoserine at residue 71 | May affect migration, but no band shift is established |
| Membrane lipid anchor | Is documented, but its effect on apparent band size is not established |
| Situation | Likely cause | Next action |
|---|---|---|
| No band in lysate | Membrane-associated RAB32 may be poorly recovered | Check membrane fractions and extraction conditions |
| Band higher than expected | The supplied features do not establish the cause of a higher band | Confirm identity by RAB32 depletion and compare sample preparation conditions |
| Band lower than expected | The supplied features do not establish a cleaved RAB32 product | Confirm identity by RAB32 depletion and check sample integrity |
| Multiple bands | Phosphorylation at Ser71 is documented, but distinct bands are not established | Compare phosphatase-treated samples and use RAB32 depletion to identify specific bands |
| Weak or no signal | Membrane localization may limit recovery in the tested fraction | Check a membrane-enriched fraction and verify transfer |
| Fragments below expected size | Sample degradation is possible; no physiological cleavage is listed | Repeat with protease protection and confirm fragments by RAB32 depletion |
Experiment evidence
Western blot images showing RAB32 band
A04645 · RAB32
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for RAB32 Western blot
🧪HPA-IHC candidate guidance (verify in WB): For positive controls for RAB32 in Western blot, you can use adipose tissue, which HPA rates as highly expressed.
Positive control: Adipose tissue (IHC candidate; verify WB)
Negative control: Caudate (IHC candidate; verify WB)
Loading controls: Run GAPDH, β-actin, and a total-protein stain such as Ponceau alongside the samples.
⚠️Feasibility: RAB32 is membrane associated, so effective lysis matters for reliable detection.
HPA tissue expression evidence for RAB32
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 → |
| Cerebral cortex | endothelial cells | High | Protein (IHC) | HPA → |
| Colon | endothelial cells | High | Protein (IHC) | HPA → |
| Liver | cholangiocytes | High | Protein (IHC) | HPA → |
Lower expression tissues · IHC evidence, not confirmed WB-negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Caudate | glial cells | Not detected | Protein (IHC) | HPA → |
| Cerebellum | cells in granular layer | Not detected | Protein (IHC) | HPA → |
| Cervix | glandular cells | Not detected | Protein (IHC) | HPA → |
| Pancreas | exocrine glandular cells | Not detected | Protein (IHC) | HPA → |
| Spleen | cells in red pulp | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced RAB32 Western Blot Tips
Deeper troubleshooting and optimisation questions for RAB32, answered from its protein features.
How should RAB32 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 alternative isoforms explain multiple RAB32 bands?
Isoforms · Only one isoform is listed, with no alternative sequence supplied. Do not assign multiple bands to RAB32 isoforms on this evidence alone.
Which documented modifications should inform band interpretation?
PTM · UniProt lists N-acetylalanine at position 2 and phosphoserine at position 71. These are UniProt coordinates; antibody or paper numbering may differ. Their presence alone does not establish a visible band shift.
Phosphoserine is listed at UniProt position 71, but the supplied features identify no responsible kinase or condition that increases its phosphorylation. Do not infer either from the listed LRRK2 interaction.
Phosphoserine is listed at UniProt position 71, but the supplied features identify no responsible kinase or condition that increases its phosphorylation. Do not infer either from the listed LRRK2 interaction.
Does this guide establish induction of RAB32?
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 RAB32?
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 A04645 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 RAB32 bands be quantified across samples?
Quantitation · Quantify bands from consistently prepared samples and compare like fractions. Because RAB32 is associated with mitochondrial and phagosomal membranes, differences in membrane recovery could affect the measured signal.
Should RAB32 migrate at exactly 25 kDa?
Interpretation · The predicted mass is 25 kDa, but no observed band size is supplied. Use 25 kDa as a starting point when inspecting the blot; these features cannot establish its apparent migration.
Prenylation is listed as a keyword, and RAB32 is described as lipid anchored. No prenylation site or observed band size is supplied, so these features alone cannot explain an unexpected band or its apparent mass.
RAB32 is listed at the mitochondrial outer membrane and on phagosomes, with a lipid anchor. Include the relevant membrane-containing fraction when preparing samples, and keep fractionation consistent across comparisons.
Prenylation is listed as a keyword, and RAB32 is described as lipid anchored. No prenylation site or observed band size is supplied, so these features alone cannot explain an unexpected band or its apparent mass.
RAB32 is listed at the mitochondrial outer membrane and on phagosomes, with a lipid anchor. Include the relevant membrane-containing fraction when preparing samples, and keep fractionation consistent across comparisons.
Boster reagents
RAB32 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-Ras-related protein Rab-32 RAB32 Antibody
Cat # A04645
A04645 is listed for RAB32 Western blotting with Human and Mouse reactivity. Its WB image uses SH-SY5Y cell lysate, with primary antibody diluted 1:1000 and incubated overnight at 4°C. The supplied evidence shows one tested sample context.
Which to pick: A04645 is the only listed option. Its WB image documents SH-SY5Y lysate under the stated conditions; check that this sample context and the listed Human or Mouse reactivity fit your experiment.
Source: BosterBio RAB32 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry Q13637.
- Human Protein Atlas. RAB32 tissue expression.
- PMC6168699 — target-verified WB comparison
- PMC10017813 — target-verified WB comparison
- PMC11580396 — target-verified WB comparison