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REN · Western blot design guide
Design a Western Blot for REN
Real validated REN Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-REN WB antibodies. Everything you need to plan the experiment before you commit precious samples.
Last reviewed: May 2026 · Scientific review: Boster Bio technical team
REN 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 | ~45.1 kDa | |
| Observed band | ~55 kDa | |
| Gel | 10–12% | |
| Positive control | Adipose tissue+4 more · see all | |
| Negative control | Adipose tissue+4 more · see all |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Glycosylated + Cleaved | |
| Caveat | N-glycosylation increases size | |
| Regulation | LPS-suppressed | |
| Isoform | 2 isoform(s) |
Section 1
Real Curated REN Western Blot Protocols
Literature-validated Western blot parameters for REN — gel percentage, transfer, blocking, antibody incubation and detection, extracted from published methods.
| Sample / lysate | human 293T , Lane 2: human HepG2 , Lane 3: human HUH-7 . After electrophoresis, proteins were transferred to a nitrocellulose membrane at 150 mA 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-Renin/REN antigen affinity purified polyclonal antibody (Catalog # A03689-3) 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 1:5000 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 Renin/REN at approximately 55 kDa. The expected band size for Renin/REN is at 45 kDa |
| Gel % | 10–12% |
| Load | 30 ug |
| 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, 1:5000 |
| Wash | TBS-0.1% Tween, 3 × 5 min |
| Detection | ECL |
| Exposure / imaging | Tanon 5200 |
| Observed band | 55 kDa |
Section 2
What Is the Expected REN Western Blot Band Size?
REN has a 45.1 kDa predicted backbone but runs at ~55 kDa on blots because secreted, glycosylated prorenin/renin carries N-glycans that outweigh propeptide loss.
| Dominant band near 55 kDa | Represents secreted, N-glycosylated renin (prorenin and/or mature form) running above the 45.1 kDa unmodified backbone |
| Broad or diffuse band spanning ~50-60 kDa | Heterogeneous glycan occupancy at the two N-glycosylation sites, Asn71 and Asn141 |
| Doublet with a slightly lower companion band near 48-50 kDa | Mixture of uncleaved prorenin zymogen (propeptide, residues 24-66, still attached) and propeptide-cleaved mature renin |
| Little or no band in whole-cell lysate | Renin is a secreted, zymogen-processed protease that is also membrane-associated via ATP6AP2, so it is depleted from cytoplasmic lysate fractions |
| Extra band at a different apparent mass from the main isoform | Alternative splicing produces isoform 1 and isoform 2 transcripts of differing length |
| Faint band below the ~55 kDa main species | Signal peptide (residues 1-23) removal upon secretion trims mass from the full-length precursor |
💡Expected REN appearanceExpect a dominant band at approximately 55 kDa, above the 45.1 kDa predicted backbone, since secreted renin (prorenin/mature) carries N-glycans at Asn71 and Asn141 that outweigh signal- and propeptide-cleavage mass loss.
| Predicted mass (45.1 kDa, 406-aa precursor) | sets the baseline unmodified backbone size before secretion and post-translational processing |
| N-glycosylation at Asn71 and Asn141 | adds carbohydrate mass that shifts the observed band up to roughly 55 kDa and can broaden it |
| Signal peptide cleavage (residues 1-23) | removes a few kDa upon secretion, slightly lowering mass relative to the full precursor |
| Propeptide cleavage (residues 24-66, zymogen activation) | loss of the ~43-residue propeptide during maturation reduces mass, so uncleaved prorenin runs higher than mature active renin |
| Splice isoforms 1 and 2 | alternative splicing can yield an additional band of qualitatively different relative size from the canonical isoform |
| Secreted zymogen (prorenin) form | much of the detected protein is the uncleaved, glycosylated prorenin zymogen rather than fully processed mature renin, favoring the heavier band |
| Situation | Likely cause | Next action |
|---|---|---|
| No band in lysate | renin is secreted extracellularly and membrane-tethered via ATP6AP2 rather than retained free in cytoplasm | probe conditioned media, serum/plasma, or membrane fractions instead of whole-cell lysate and use renin-producing tissue/cell sources |
| Band higher than expected | N-glycosylation at Asn71 and Asn141 adds mass above the 45.1 kDa backbone, and uncleaved prorenin retains its propeptide | treat lysate with PNGase F to deglycosylate and compare against native sample to confirm the ~55 kDa band is the glycosylated secreted form |
| Band lower than expected | propeptide removal during zymogen-to-mature activation strips ~43 residues, or a non-glycosylated recombinant standard was used | confirm sample identity (native vs recombinant, mature vs zymogen) and compare against a characterized positive control |
| Broad smear instead of sharp band | heterogeneous glycan occupancy across the two N-glycosylation sites produces microheterogeneity | run a PNGase F-deglycosylated lane alongside the native sample and optimize transfer time to sharpen resolution |
| Multiple bands | co-detection of prorenin zymogen, propeptide-cleaved mature renin, and possibly isoform 2 splice variant | compare band pattern to a mature recombinant renin standard and check antibody epitope location to determine which forms are detected |
| Weak or no signal | renin is a low-abundance secreted protein expressed mainly in kidney and select tissues, so many cell lysates contain little of it | increase protein loading, use plasma/serum or known renin-expressing sources, and concentrate conditioned medium before loading |
Experiment evidence
Western blot images showing REN band
A03689-3 · REN
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for REN Western blot
🧪For positive controls for REN in Western blot, you can use recombinant human renin protein or serum/plasma, since none of the tissues in the supplied HPA panel (adipose tissue, adrenal gland, appendix, bone marrow) showed detectable expression and REN is a secreted protein best captured outside whole-cell lysate.
Positive control: Recombinant renin protein
Negative control: Adipose tissue
Loading controls: Run GAPDH and β-actin antibodies alongside a total-protein stain (e.g., stain-free gel, Ponceau S, or REVERT) for normalization.
⚠️Feasibility: As a secreted protein with no positive tissue detected in the tested HPA panel, whole-cell lysates likely give weak signal, so favor conditioned medium, serum/plasma, or purified recombinant protein for a reliable positive control.
HPA tissue expression evidence for REN
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 |
|---|---|---|---|---|
| Adipose tissue | adipocytes | Not detected | Protein (IHC) | HPA → |
| Adrenal gland | glandular cells | Not detected | Protein (IHC) | HPA → |
| Appendix | glandular cells | Not detected | Protein (IHC) | HPA → |
| Bone marrow | hematopoietic cells | Not detected | Protein (IHC) | HPA → |
| Breast | adipocytes | Not detected | Protein (IHC) | HPA → |
Undetected expression · recommended negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Adipose tissue | adipocytes | Not detected | Protein (IHC) | HPA → |
| Adrenal gland | glandular cells | Not detected | Protein (IHC) | HPA → |
| Appendix | glandular cells | Not detected | Protein (IHC) | HPA → |
| Bone marrow | hematopoietic cells | Not detected | Protein (IHC) | HPA → |
| Breast | adipocytes | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced REN Western Blot Tips
Deeper troubleshooting and optimisation questions for REN, answered from its protein features.
Why does REN run heavier than its predicted 45 kDa mass?
REN carries two N-glycosylation sites, and glycosylation typically adds several kDa, shifting the apparent band to ~55 kDa versus the 45.1 kDa predicted mass. Incomplete glycan removal under standard SDS-PAGE further widens this gap, so a shift of this magnitude is expected, not a specificity concern.
Could REN isoforms appear as separate Western blot bands?
REN has two annotated isoforms from alternative splicing. If your antibody's epitope is present in both, you may see two closely spaced bands differing by the size of the spliced region; confirm which isoform(s) your antibody recognizes before interpreting band patterns.
What regulates REN expression and processing before detection?
Renin is synthesized as a zymogen; its propeptide (residues 24-66) is proteolytically removed to generate mature, active renin. Renin release from juxtaglomerular cells is physiologically induced by reduced renal perfusion pressure and beta-adrenergic stimulation, so induction protocols should account for both expression and activation-state changes.
How should blocking be optimized for glycosylated REN?
Because REN is a glycoprotein with two N-glycosylation sites, avoid milk-based blockers, whose lectins and glycoproteins can bind glycan epitopes and increase background. Use BSA instead, especially if the antibody targets a region near either glycosylation site.
What transfer method to use for REN Western blot?
REN contains three disulfide bonds, so reduce samples with DTT or beta-mercaptoethanol before loading to linearize the protein for accurate migration. At ~45-55 kDa, standard wet or semi-dry transfer to PVDF membrane is efficient; extended transfer times are not required for a protein this size.
Which REN form should be targeted for quantitation?
Since REN circulates as both pro-renin (zymogen) and cleaved mature renin, confirm whether your antibody epitope lies within the propeptide (24-66) or the mature enzyme, as this determines whether you quantify total renin or only the active form. Normalize to total protein rather than a single housekeeping gene.
What explains extra bands near the REN band?
A higher band near 50 kDa may represent uncleaved pro-renin (zymogen), while a lower band reflects mature renin after propeptide removal. REN also associates with membrane-bound ATP6AP2; incomplete denaturation of this complex could produce an additional higher-molecular-weight species.
Boster reagents
Best REN Western Blot Antibodies
BosterBio's REN 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-Renin/REN Antibody Picoband®
Cat # A03689-3
These anti-Renin/REN antibodies are top-performing, widely cited reagents, thoroughly validated by Western blot and cross-checked against negative-tissue controls and complementary methods—delivering specific, reproducible, publication-ready detection you can trust for REN studies.
Which to pick: Only one Boster anti-REN antibody is catalogued here, A03689-3—pick it by default, since it includes an actual Western blot validation image confirming specific detection of Renin/REN, giving you confidence before running your own experiment.
Source: BosterBio REN gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry P00797.
- Human Protein Atlas. REN tissue expression.