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GABRG2 · Western blot design guide
Design a Western Blot for GABRG2
Real validated GABRG2 Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-GABRG2 WB antibodies. Everything you need to plan the experiment before you commit precious samples.
Last reviewed: May 2026 · Scientific review: Boster Bio technical team
GABRG2 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 | ~55.2 kDa | |
| Observed band | Approximately 50 kDa | |
| Gel | 10–12% | |
| Negative control | siRNA / KO lysate |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Glycosylated + Cleaved | |
| Caveat | N-glycosylation alters mobility | |
| Regulation | LPS-induced | |
| Isoform | 3 isoform(s) |
Section 1
Real Curated GABRG2 Western Blot Protocols
Literature-validated Western blot parameters for GABRG2 — gel percentage, transfer, blocking, antibody incubation and detection, extracted from published methods.
| Sample / lysate | rat brain , Lane 2: rat brain . 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-GABA A Receptor gamma 2/GABRG2 antigen affinity purified polyclonal antibody (Catalog # A02361-1) 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 1:5000 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 GABA A Receptor gamma 2/GABRG2 at approximately 50KD. The expected band size for GABA A Receptor gamma 2/GABRG2 is at 50KD |
| 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, 1:5000 |
| Wash | TBS-0.1% Tween, 3 × 5 min |
| Detection | ECL |
| Exposure / imaging | Tanon 5200 |
| Observed band | 50 kDa |
Section 2
What Is the Expected GABRG2 Western Blot Band Size?
GABRG2 has a 55.2 kDa precursor backbone but runs at approximately 50 kDa in brain lysate because signal-peptide cleavage outweighs the mass added by its three N-glycans.
| Single band at approximately 50 kDa | This is the mature, signal-peptide-cleaved and glycosylated form of GABRG2, matching the empirical band reported for brain tissue lysate |
| Band running below the 55.2 kDa predicted precursor mass | Cleavage of the 39-residue N-terminal signal peptide removes mass from the full-length translation product, pulling the mature band under the predicted size |
| Slightly diffuse or broadened band rather than a razor-sharp line | Heterogeneous occupancy and processing of the three N-linked glycosylation sites (Asn52, Asn129, Asn247) adds variable carbohydrate mass across molecules |
| More than one band at distinct apparent masses | Co-expression of different GABRG2 splice isoforms (1, 2, 3) with differing exon content in the sample |
| Weak or absent signal in a crude whole-cell lysate without membrane enrichment | GABRG2 is a multi-pass postsynaptic/plasma membrane protein, so unenriched preparations under-represent it relative to membrane-fraction lysates |
| No change in band position between reducing and non-reducing conditions | The single Cys190-Cys204 disulfide is intrachain, stabilizing the extracellular fold rather than linking separate monomers, so it does not create a higher-mass dimer band |
💡Expected GABRG2 appearanceGABRG2 is expected as a single band at approximately 50 kDa in brain tissue lysate, reflecting the 55.2 kDa precursor after signal-peptide cleavage and addition of three N-linked glycans.
| Predicted mass from UniProt (55.2 kDa) | Sets the baseline unmodified backbone size before any cleavage or modification is applied |
| Signal peptide cleavage (residues 1-39) | Removes the N-terminal signal sequence from the mature protein, lowering the apparent mass to around the observed 50 kDa rather than the 55.2 kDa precursor |
| N-glycosylation at Asn52, Asn129, and Asn247 | Adds carbohydrate mass and can broaden the band, partially offsetting the mass lost to signal-peptide cleavage |
| Three named splice isoforms (1, 2, 3) | Differential exon usage among isoforms can yield additional bands at slightly different apparent masses depending on which isoform(s) a sample expresses |
| Single intrachain disulfide bond (Cys190-Cys204) | Stabilizes the extracellular cys-loop fold but does not crosslink separate chains, so it does not shift the monomer band size under reducing or non-reducing conditions |
| Situation | Likely cause | Next action |
|---|---|---|
| No band in lysate | GABRG2 is a multi-pass membrane protein concentrated in postsynaptic membranes and is not efficiently solubilized by mild lysis conditions | Use a detergent-based lysis buffer (e.g. RIPA or 1% Triton/NP-40) and enrich for the membrane fraction before loading |
| Band higher than expected | Incomplete denaturation of the multi-pass transmembrane protein leaves residual complex or aggregate that migrates above 50 kDa | Increase SDS and heat denaturation time and confirm a reducing agent such as DTT or beta-mercaptoethanol is fresh and present |
| Band lower than expected | Loss of N-glycan mass, from deglycosylation treatment or a non-mammalian expression system lacking the modification, shifts the band below the normal 50 kDa | Compare against an untreated mammalian-expressed positive control or a PNGase F-treated reference lane |
| Broad smear instead of sharp band | Heterogeneous occupancy and processing at the three N-linked glycosylation sites produces microheterogeneity in apparent mass | Extend gel run time for better resolution or treat an aliquot with PNGase F to collapse the smear into a single deglycosylated band |
| Multiple bands | Detection of more than one of the three GABRG2 splice isoforms, or partial proteolytic degradation of the membrane protein during lysis | Include protease inhibitors during lysis and compare the pattern to isoform-specific controls |
| Weak or no signal | GABRG2 is a minor subunit within the pentameric GABA-A receptor complex, so its relative abundance in total lysate is low | Enrich the synaptic membrane fraction or increase total protein loaded per lane |
Experiment evidence
Western blot images showing GABRG2 band
A02361-1 · GABRG2
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for GABRG2 Western blot
🧪For positive controls for GABRG2 in Western blot, you can use whole brain tissue lysate (e.g., cerebral cortex), since HPA has no expression data for this gene and GABRG2 is a GABA-A receptor subunit localized to the postsynaptic membrane of neurons.
Positive control: Brain tissue (cerebral cortex)
Negative control: No HPA data available; use siRNA knockdown or KO line
Loading controls: Run GAPDH, β-actin, and a total-protein stain (stain-free gel, Ponceau S, or REVERT) alongside your target blot as loading controls.
⚠️Feasibility: As a multi-pass postsynaptic membrane protein with no HPA expression data, control selection relies on known neuronal biology rather than confirmed tissue profiling, so a genetic negative (siRNA/KO) is more reliable than any assumed negative tissue.
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 GABRG2 Western Blot Tips
Deeper troubleshooting and optimisation questions for GABRG2, answered from its protein features.
Why does GABRG2 run near 50 kDa instead of 55 kDa?
Cleavage of the 39-residue signal peptide removes about 4 kDa from the 55.2 kDa precursor, and the mature glycosylated protein typically migrates near 50 kDa on SDS-PAGE. Confirm identity using an antibody epitope outside the signal region, and compare against the 50 kDa observed band rather than the unprocessed predicted mass.
Could GABRG2 isoforms cause multiple bands?
GABRG2 has three annotated isoforms from alternative splicing, so blots may show closely spaced bands instead of one 50 kDa species. If a single band is expected, choose an antibody targeting a region common to all isoforms, or verify which isoform the antibody recognizes before calling extra bands nonspecific.
How do glycosylation and palmitoylation affect band size?
GABRG2 carries three predicted N-glycosylation sites and a palmitoylation site, adding mass and heterogeneity beyond the core polypeptide. This can broaden the band or shift it above the calculated 55.2 kDa mass. If smearing is seen, PNGase F treatment before SDS-PAGE can remove N-linked glycans and sharpen the band.
What blocking buffer works best for this glycoprotein?
Because GABRG2 is a glycoprotein, milk-based blockers contain glycoproteins and lectin-binding sugars that can raise background or interfere with glycan-sensitive antibodies. Use BSA-based blocking buffer instead, and allow extended blocking time given the protein's membrane localization and multiple glycosylation sites.
What transfer method to use for GABRG2 Western blot?
GABRG2 is a multi-pass transmembrane protein anchored in the postsynaptic and plasma membrane, so its hydrophobic domains can resist efficient elution from the gel. Use wet transfer with reduced methanol (around 10%) or semi-dry transfer at lower voltage for a longer duration, extending total transfer time for complete recovery.
Which loading control suits GABRG2 quantitation?
Since GABRG2 is a postsynaptic and plasma membrane protein, a membrane-associated loading control such as Na+/K+-ATPase is more appropriate than cytosolic controls like GAPDH, particularly when comparing membrane or synaptosomal fractions across samples.
Why might a higher molecular weight band appear?
GABRG2 assembles into heteropentameric GABA-A receptors with alpha, beta, and other subunits, and incomplete denaturation or its single disulfide bond can leave partial complexes intact. Fully reduce and heat samples in SDS sample buffer with fresh reducing agent to resolve monomeric 50 kDa GABRG2 from higher-order oligomeric species.
Boster reagents
Best GABRG2 Western Blot Antibodies
BosterBio's GABRG2 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-GABA A Receptor gamma 2/GABRG2 Antibody Picoband®
Cat # A02361-1
Boster's anti-GABRG2 antibody (A02361-1) is validated by Western blot, showing a specific band for GABRG2 at the expected size on SDS-PAGE—giving researchers a documented, image-backed starting point for reliable GABRG2 detection.
Which to pick: Only one Boster GABRG2 antibody is catalogued here, A02361-1, which includes an actual Western blot validation image—so it's the clear (and only) choice; confirm species/tissue reactivity against your sample before ordering.
Source: BosterBio GABRG2 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry P18507.
- Human Protein Atlas. GABRG2 tissue expression.