TIRAP / Toll/interleukin-1 receptor domain-containing adapter protein · Western blot design guide

Design a Western Blot for TIRAP

Real validated TIRAP Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-TIRAP 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 TIRAP: expected band ~23.9 kDa, hero antibody M00950-1, catalog values and labelled standard workflow; separate PMC comparisons on the guide — Printable **TIRAP** Western blot protocol sheet — expected band ~23.9 kDa, antibody M00950-1, controls and PMC citations. Open the full TIRAP WB guide →

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TIRAP 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	~23.9 kDa
	Observed band	~28 kDa
	Gel	12% (catalog M00950-1)
	Negative control ⓘ	Suggested KO / knockdown lysate

Important caveats

Reasons your observed band may differ from the expected size.

	PTM	Phosphorylated + Ubl conjugation
	Caveat	Modification-state controls
	Gene-set association	MSigDB C7 membership
	Isoform	3 isoform(s)

Section 1

Real Curated TIRAP Western Blot Protocols

The M00950-1 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 spleen, rat thymus, mouse spleen (catalog M00950-1)
Gel %	12% (catalog M00950-1)
Load	30 ug; reducing conditions (catalog M00950-1)
Transfer	a nitrocellulose membrane at 150 mA for 50-90 minutes (catalog M00950-1)
Membrane	nitrocellulose membrane (catalog M00950-1)
Blocking	5% non-fat milk/TBS for 1.5 hour at RT (catalog M00950-1)
Primary antibody	M00950-1 · 1:500 (catalog M00950-1)
Primary incubation	overnight at 4°C (catalog M00950-1)
Secondary antibody	goat anti-rabbit IgG-HRP, 1:5000 (catalog M00950-1)
Secondary incubation	1.5 hour at RT (catalog M00950-1)
Wash	TBS-0.1%Tween 3 times with 5 minutes each (catalog M00950-1)
Detection	ECL (catalog M00950-1)

Section 2

What Is the Expected TIRAP Western Blot Band Size?

TIRAP is predicted at 23.9 kDa, while an empirical reducing blot shows about 28 kDa; the cause of this difference is not established.

What am I looking at on my blot?
Band near 28 kDa	Empirical TIRAP band reported in reducing tissue lysates; confirm identity with appropriate controls
Band near 23.9 kDa	Near the predicted TIRAP mass, though migration at this position is not established here
Band near twice the monomer size under nonreducing conditions	Could reflect TIRAP homodimers if they survive sample preparation
Several bands at different positions	Could reflect isoforms 1, 2, and 3; distinct migration is not established

💡Expected TIRAP appearanceTIRAP has a predicted mass of 23.9 kDa, while reducing Western blots report a band near 28 kDa; the cause of the difference is unestablished, so confirm identity with appropriate controls.

How each factor affects band size
Predicted TIRAP mass	23.9 kDa predicted; the reported band is near 28 kDa, with no established cause for the difference
TIRAP homodimer	Could appear near twice the monomer size if retained during sample preparation
Splice isoform 1	Its individual mass and migration are not supplied
Splice isoform 2	Its individual mass and migration are not supplied
Splice isoform 3	Its individual mass and migration are not supplied

Why is my band missing or off?
Situation	Likely cause	Next action
No band in lysate	Membrane-associated TIRAP may be underrepresented in the prepared fraction	Check membrane recovery and run a positive-control lysate
Band higher than expected	A retained homodimer is possible under nonreducing or incomplete reducing conditions; the 28 kDa difference is unexplained	Compare reducing conditions and verify the band with an independent antibody or TIRAP depletion
Band lower than expected	An isoform is possible, but individual isoform sizes are unknown	Check antibody epitope coverage and verify the band with TIRAP depletion
Multiple bands	TIRAP has three named isoforms, but separate bands are not established	Compare isoform coverage and use TIRAP depletion to identify specific bands
Weak or no signal	TIRAP may be poorly recovered from the membrane-associated fraction	Check extraction and loading with a positive-control lysate

Source: UniProt P58753 Human Protein Atlas product datasheet (M00950-1)

Experiment evidence

Western blot images showing TIRAP band

M00950-1 · TIRAP

← swipe / scroll for more images →

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

Sample controls for TIRAP Western blot

🧪For positive controls for TIRAP in Western blot, you can use no HPA-supported tissue or cell line from the supplied evidence.

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 data are absent, so no tissue control is validated; a knockdown or KO line can provide a negative control.

HPA tissue expression evidence for TIRAP

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 TIRAP Western Blot Tips

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

How should TIRAP 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 TIRAP isoforms produce different bands?

Isoforms · Three isoforms are listed. Relative to the 221-residue canonical sequence, isoform 2 replaces residues 216–221 with a 20-residue sequence, while isoform 3 replaces residue 221 with a 34-residue sequence. These UniProt coordinates may differ from antibody or paper numbering. Check whether the antibody recognizes their differing C termini; distinct visible bands are not established.

Do TIRAP modifications explain a shifted band?

PTM · UniProt labels TIRAP a phosphoprotein and lists Ubl conjugation, but supplies no modified-residue coordinates here. These annotations alone do not establish a visible shift or explain the approximately 28 kDa band. Interpret treatment-dependent bands using an appropriate modification-specific control.

Does this guide establish induction of TIRAP?

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 TIRAP?

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 M00950-1 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 TIRAP bands be quantified across samples?

Quantitation · Use the same sample preparation and antibody across samples, and quantify a consistently identified TIRAP band. Because three isoforms are listed and TIRAP occurs in cytoplasmic and membrane locations, define which band and fraction the measurement represents. The supplied features do not establish that every band contains the same isoform.

Why does TIRAP appear near 28 kDa instead of 23.9 kDa?

Interpretation · 23.9 kDa is the predicted mass; approximately 28 kDa is the reported apparent band. The supplied features do not establish the cause of this difference. Use the observed position as a reference and confirm band identity with a specific control.

Two disulfide bonds are listed, without coordinates. Keep reducing conditions consistent between samples. A reducing versus nonreducing comparison can test whether disulfide status affects the pattern, but the feature count does not predict a particular band.

TIRAP is reported to form homodimers and heterodimers with MYD88. That interaction does not show that a dimer survives Western blot sample preparation. Compare denaturing conditions and verify band identity before assigning a higher band to a TIRAP complex.

UniProt places TIRAP in the cytoplasm and at membranes, including the cell membrane. If using fractionated samples, examine both fractions under consistent preparation conditions; a change in one fraction may reflect redistribution rather than a change in total TIRAP.

Boster reagents

TIRAP 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 TIRAP using anti-TIRAP antibody (M00950-1). Electrophoresis was performed on a 12% 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 spleen tissue lysates, Lane 2: rat thymus tissue lysates, Lane 3: mouse spleen tissue lysates, Lane 4: mouse thymus 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-TIRAP antigen affinity purified monoclonal antibody (M00950-1) 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 TIRAP at approximately 28 kDa. The expected band size for TIRAP is at 24 kDa.

Anti-TIRAP Rabbit Monoclonal Antibody

Cat # M00950-1

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The catalog reports one anti-TIRAP antibody for Western blot: rabbit monoclonal M00950-1. Its WB image shows rat spleen and thymus and mouse spleen and thymus lysates, with a band near 28 kDa versus an expected 24 kDa. No human WB image is supplied.

Which to pick: M00950-1 is the only listed option. It is catalogued as reactive with human, mouse, and rat; the supplied WB image documents rat and mouse tissue lysates at a 1:500 primary dilution. For human samples, the supplied image provides no direct example.

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

References

UniProt Consortium. UniProt entry P58753.
Human Protein Atlas. TIRAP tissue expression.
PMC13481357 — target-verified WB comparison
PMC6627414 — target-verified WB comparison
PMC13541672 — target-verified WB comparison