PITX3 / Pituitary homeobox 3 · Western blot design guide

Design a Western Blot for PITX3

Source-linked PITX3 Western blot protocol options, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-PITX3 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

Western blot protocol sheet for PITX3: expected band ~31.8 kDa, hero antibody M03453, catalog values and labelled standard workflow; separate PMC comparisons on the guide — Printable **PITX3** Western blot protocol sheet — expected band ~31.8 kDa, antibody M03453, controls and PMC citations. Open the full PITX3 WB guide →

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PITX3 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	~31.8 kDa
	Observed band	~36 kDa
	Gel	10% (catalog M03453)
	Negative control ⓘ	Suggested KO / knockdown lysate

Important caveats

Reasons your observed band may differ from the expected size.

	PTM	Phosphorylated
	Caveat	Phosphorylation-state controls
	Gene-set association	MSigDB C7 membership
	Isoform	1 isoform(s)

Section 1

Source-Linked PITX3 Western Blot Protocol Options

The M03453 protocol combines labelled catalog values with standard starting conditions. Published comparisons retain their own sample, reagent and detection scope.

Recommended Western blot protocol parameters
Sample / lysate	rat skeletal muscle (catalog M03453)
Gel %	10% (catalog M03453)
Load	30 ug; reducing conditions (catalog M03453)
Transfer	a nitrocellulose membrane at 150 mA for 50-90 minutes (catalog M03453)
Membrane	nitrocellulose membrane (catalog M03453)
Blocking	5% non-fat milk/TBS for 1.5 hour at RT (catalog M03453)
Primary antibody	M03453 · 1:500 (catalog M03453)
Primary incubation	overnight at 4°C (catalog M03453)
Secondary antibody	goat anti-rabbit IgG-HRP, 1:5000 (catalog M03453)
Secondary incubation	1.5 hour at RT (catalog M03453)
Wash	TBS-0.1%Tween 3 times with 5 minutes each (catalog M03453)
Detection	ECL (catalog M03453)

Section 2

What Is the Expected PITX3 Western Blot Band Size?

PITX3 is predicted at 31.8 kDa and observed near 36 kDa; the cause of this difference is not established.

What am I looking at on my blot?
Band near 36 kDa	Matches the empirical PITX3 band; confirm identity with controls
Band near 31.8 kDa	Near the UniProt predicted mass; identity requires confirmation
Little or no band in a cytoplasmic fraction	PITX3 is annotated as nuclear
Doublet near the expected region	Phosphoserines at residues 52 and 57 are possible contributors, but distinct migration is unproven

💡Expected PITX3 appearanceUniProt predicts PITX3 at 31.8 kDa, while antibody QC shows a band near 36 kDa; the difference is unexplained, so confirm identity with appropriate controls.

How each factor affects band size
UniProt predicted molecular weight	31.8 kDa is the sequence-based reference, while the empirical band is near 36 kDa
302-residue sequence	Defines the predicted protein length; no separate processed size is annotated
Phosphoserine at residue 52	A migration effect is possible but not established
Phosphoserine at residue 57	A migration effect is possible but not established

Why is my band missing or off?
Situation	Likely cause	Next action
No band in lysate	Nuclear PITX3 may be poorly represented in the preparation	Check a nuclear fraction and include a positive control
Band higher than expected	The observed 36 kDa band exceeds the 31.8 kDa prediction for an unknown reason	Compare with the QC band and verify specificity with an independent control
Band lower than expected	Identity or protein integrity is uncertain	Check sample integrity and verify the band with an independent control
Multiple bands	Phosphorylation states are possible, but distinct bands are unproven	Compare treated and untreated samples and verify band identity
Weak or no signal	Nuclear PITX3 may be underrepresented in the loaded sample	Assess nuclear extraction and use a positive control

Source: UniProt O75364 Human Protein Atlas product datasheet (M03453)

Experiment evidence

Western blot images showing PITX3 band

M03453 · PITX3

← swipe / scroll for more images →

Real WB data behind the band-size expectations in this section.

Sample controls for PITX3 Western blot

🧪For positive controls for PITX3 in Western blot, you can use a sample with independently confirmed PITX3 expression; HPA provides no positive candidate.

Positive control: No high/medium HPA tissue identified

Negative control: Suggested KO / knockdown lysate

Loading controls: Run GAPDH, β-actin, and a total-protein stain alongside the samples.

⚠️Feasibility: HPA provides no expression data, so suitable tissue controls cannot be identified from the supplied evidence.

HPA tissue expression evidence for PITX3

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
No high/medium HPA tissues identified in the supplied evidence.

Lower expression tissues · IHC evidence, not confirmed WB-negative controls

Tissue	Cell type	Level	Evidence	Source
No lower-expression tissue rows available in the supplied evidence.

Section 3

Advanced PITX3 Western Blot Tips

Deeper troubleshooting and optimisation questions for PITX3, answered from its protein features.

How should PITX3 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 annotated PITX3 isoforms explain multiple bands?

Isoforms · UniProt lists one PITX3 isoform and no alternative sequence. Its supplied features therefore do not support assigning additional bands to annotated isoforms.

Which PITX3 phosphorylation sites should I consider?

PTM · UniProt lists phosphoserines at positions 52 and 57 in its 302-residue canonical sequence. Check the numbering convention when comparing papers or antibodies; their coordinates may differ. These annotations do not establish a visible band shift.

The supplied UniProt features list no glycosylation sites or signal peptide. They provide no basis for assigning an unexpected band to glycosylated PITX3.

Does this guide establish induction of PITX3?

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 PITX3?

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 M03453 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 I quantify the PITX3 band?

Quantitation · Define the band consistently across samples, accounting for the reported approximately 36 kDa position and the predicted 31.8 kDa mass. Compare equivalent sample fractions; UniProt places PITX3 in the nucleus. Do not infer phosphorylation levels from total band intensity alone.

Why might PITX3 appear near 36 kDa instead of 31.8 kDa?

Interpretation · The observed band is approximately 36 kDa, while the predicted mass is 31.8 kDa. UniProt lists phosphoserines at positions 52 and 57, but their presence alone does not explain the apparent mass difference. Verify band identity before assigning a cause.

UniProt places PITX3 in the nucleus. Include a nuclear fraction when assessing detection, and compare like fractions across samples when quantifying its signal.

UniProt reports an interaction with SFPQ, but this annotation does not establish that an extra band contains PITX3 or an SFPQ complex. Confirm the identity of unexpected bands independently.

Boster reagents

PITX3 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

Western blot analysis of PITX3 using anti-PITX3 antibody (M03453). Electrophoresis was performed on a 10% SDS-PAGE gel at 80V (Stacking gel) / 120V (Resolving gel) for 2 hours. The sample well of each lane was loaded with 30 ug of sample under reducing conditions. Lane 1: rat skeletal muscle tissue lysates. 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-PITX3 antigen affinity purified monoclonal antibody (M03453) at 1:500 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 ECL Plus Western Blotting Substrate (Catalog # AR1196-200) with Tanon 5200 system. A specific band was detected for PITX3 at approximately 36 kDa. The expected band size for PITX3 is at 32 kDa.

Anti-PITX3 Rabbit Monoclonal Antibody

Cat # M03453

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The catalog reports one anti-PITX3 antibody, M03453, with stated reactivity to human, mouse, and rat. Its WB image uses rat skeletal muscle lysate and reports a band near 36 kDa, versus an expected 32 kDa. The supplied evidence shows no human or mouse WB samples.

Which to pick: M03453 is the only listed option and has a WB image from rat skeletal muscle lysate at 1:500 primary dilution. For human or mouse samples, reactivity is listed, but the supplied WB example does not test those specimens.

Source: BosterBio PITX3 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.

References

UniProt Consortium. UniProt entry O75364.
Human Protein Atlas. PITX3 tissue expression.
PMC6358784 — target-verified WB comparison
PMC5607831 — target-verified WB comparison
PMC2787638 — target-verified WB comparison