TLR9 / Toll-like receptor 9 · Western blot design guide

Design a Western Blot for TLR9

Real validated TLR9 Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-TLR9 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 TLR9: expected band ~115.9 kDa, hero antibody A00198-3, catalog values and labelled standard workflow; separate PMC comparisons on the guide — Printable **TLR9** Western blot protocol sheet — expected band ~115.9 kDa, antibody A00198-3, controls and PMC citations. Open the full TLR9 WB guide →

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TLR9 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	~115.9 kDa
	Observed band	~116 kDa
	Gel	5–20% (catalog A00198-3)
	Negative control ⓘ	Suggested KO / knockdown lysate

Important caveats

Reasons your observed band may differ from the expected size.

	PTM	Glycosylated + Cleaved
	Caveat	Processing-state controls
	Gene-set association	MSigDB C7 membership
	Isoform	5 isoform(s)

Section 1

Real Curated TLR9 Western Blot Protocols

The A00198-3 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	human Jurkat, human Raji, human Daudi (catalog A00198-3)
Gel %	5–20% (catalog A00198-3)
Load	30 ug; reducing conditions (catalog A00198-3)
Transfer	a nitrocellulose membrane at 150 mA for 50-90 minutes (catalog A00198-3)
Membrane	nitrocellulose membrane (catalog A00198-3)
Blocking	5% non-fat milk/TBS for 1.5 hour at RT (catalog A00198-3)
Primary antibody	A00198-3 · 0.5 μg/mL (catalog A00198-3)
Primary incubation	overnight at 4°C (catalog A00198-3)
Secondary antibody	goat anti-rabbit IgG-HRP, 1:5000 (catalog A00198-3)
Secondary incubation	1.5 hour at RT (catalog A00198-3)
Wash	TBS-0.1%Tween 3 times with 5 minutes each (catalog A00198-3)
Detection	ECL (catalog A00198-3)

Section 2

What Is the Expected TLR9 Western Blot Band Size?

TLR9 is predicted at 115.9 kDa and observed near 116 kDa in reducing lysates; its features permit other forms, but no migration difference is demonstrated.

What am I looking at on my blot?
Band near 116 kDa	Matches the reported TLR9 band in reducing whole-cell lysates and the 115.9 kDa predicted mass; confirm identity with antibody controls.
Higher band near twice the monomer size	Could reflect a preserved TLR9 homodimer; dimerization depends on CpG ligand and Z-loop processing.
Band below the full-length position	Could reflect signal-peptide removal or proteolytic processing; the fragment size is not supplied.
Several bands at different positions	Could reflect isoforms 1–5 or processing, but distinct isoform migration is not established.
Higher or diffuse signal near the monomer	Could reflect variable N-linked glycosylation; the listed sites alone do not establish a visible shift or smear.

💡Expected TLR9 appearanceThe predicted full-length mass is 115.9 kDa, and an approximately 116 kDa band was observed in reducing whole-cell lysates; confirm band identity with appropriate antibody controls.

How each factor affects band size
Predicted full-length mass	115.9 kDa provides the reference for the approximately 116 kDa observed band.
N-linked glycosylation at Asn64, Asn129, Asn200, Asn210, Asn242, Asn300, Asn340 and Asn469	May alter apparent migration; site listings do not establish the size of any shift.
Signal peptide at residues 1–25	Its removal can make mature protein smaller than the full-length precursor.
CpG-dependent homodimer	May produce a band near twice the monomer size if the dimer survives sample preparation.
Isoforms 1, 2, 3, 4 and 5	May differ in size, but their masses and resolvable band positions are not supplied.

Why is my band missing or off?
Situation	Likely cause	Next action
No band in lysate	TLR9 is a membrane protein localized to intracellular compartments, so the sampled lysate may contain little detectable receptor.	Check expression and compare whole-cell lysate with a membrane-enriched fraction.
Band higher than expected	A TLR9 homodimer may persist, or N-linked glycans may affect migration; neither is established for that band.	Compare reducing and non-reducing samples and use an antibody specificity control.
Band lower than expected	Signal-peptide removal or proteolytic processing may reduce apparent size.	Compare antibodies recognizing different regions and check sample handling.
Broad smear instead of sharp band	Heterogeneous N-linked glycosylation is possible, but the site list does not establish a smear.	Compare paired untreated and deglycosylated samples with a specificity control.
Multiple bands	Isoforms or processing may contribute, but distinct isoform band positions are unknown.	Check bands with a second antibody recognizing a different region or with TLR9 depletion.
Fragments below expected size	Z-loop proteolytic processing is required for homodimerization; fragment masses are not supplied.	Compare antibodies against different regions and include protease inhibitors during preparation.

Source: UniProt Q9NR96 Human Protein Atlas product datasheet (A00198-3)

Experiment evidence

Western blot images showing TLR9 band

A00198-3 · TLR9

A00198-2 · TLR9

M00198 · TLR9

A00198-1 · TLR9

← swipe / scroll for more images →

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

Sample controls for TLR9 Western blot

🧪For positive controls for TLR9 in Western blot, you can use a validated TLR9-positive sample once identified; the supplied HPA evidence names none.

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 such as Ponceau alongside the samples.

⚠️Feasibility: TLR9 is membrane-associated, and the supplied HPA data provide no tissue controls or evidence of ubiquitous expression.

HPA tissue expression evidence for TLR9

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 TLR9 Western Blot Tips

Deeper troubleshooting and optimisation questions for TLR9, answered from its protein features.

How should TLR9 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.

Which TLR9 isoforms could affect band interpretation?

Isoforms · UniProt lists five isoforms. Isoform 2 lacks residues 1–57; isoform 5 changes residues 1–16; isoforms 3 and 4 replace the first residue with different N-terminal sequences. Check whether the antibody recognizes a region retained in the isoform being studied. These sequence differences alone do not establish distinct visible bands.

Which annotated modifications should I consider for TLR9?

PTM · TLR9 has N-linked glycosylation annotations at Asn64, 129, 200, 210, 242, 300, 340, 469, 474, 513, 567, 694 and 731. These are UniProt canonical-sequence coordinates; antibody or paper numbering may differ. The supplied record lists no modified-residue coordinates beyond these glycosylation sites.

Does this guide establish induction of TLR9?

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.

What transfer method to use for TLR9 Western blot?

Transfer · TLR9 is a single-pass membrane protein with a reported band near 116 kDa. Choose transfer conditions suitable for a protein of that size, then check the membrane and gel for transfer efficiency. The supplied features do not specify a particular transfer method.

How should blocking be optimized?

Blocking · Standard workflow guidance: follow the A00198-3 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 TLR9 bands?

Quantitation · Define which band you will measure before comparing samples, since TLR9 has five isoforms and undergoes proteolytic processing of a Z-loop. Use the same antibody-recognized band across samples and account for whether samples contain whole-cell protein or material from the listed membrane compartments.

Why might TLR9 migrate differently from its predicted mass?

Interpretation · The predicted mass is 115.9 kDa, and the reported apparent band is about 116 kDa. TLR9 has a signal peptide at residues 1–25 and 13 annotated N-linked glycosylation sites. These features may affect the detected form, but their presence alone does not establish a visible shift or explain a mass difference.

Consider the five annotated isoforms, N-linked glycosylation, the 1–25 signal peptide and proteolytic processing of a Z-loop. Check the antibody epitope against isoform sequences before assigning a band. The supplied features do not specify fragment sizes or prove which feature produced an observed band.

No abundance change is specified. The supplied oligomer feature says TLR9 is monomeric without unmethylated CpG ligand and that Z-loop proteolytic processing is required for homodimerization. Compare band intensity only as an experimental measurement; do not infer induction from those features alone.

Boster reagents

TLR9 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 TLR9 using anti-TLR9 antibody (A00198-3). Electrophoresis was performed on a 5-20% SDS-PAGE gel at 70V (Stacking gel) / 90V (Resolving gel) for 2-3 hours. The sample well of each lane was loaded with 30 ug of sample under reducing conditions. Lane 1: human Jurkat whole cell lysates, Lane 2: human Raji whole cell lysates, Lane 3: human Daudi whole cell lysates, Lane 4: human MOLT-4 whole cell lysates, Lane 5: rat 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-TLR9 antigen affinity purified polyclonal antibody (Catalog # A00198-3) 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 TLR9 at approximately 116 kDa. The expected band size for TLR9 is at 116 kDa.

Anti-TLR9 Antibody Picoband®

Cat # A00198-3

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Real WB data Western blot analysis of TLR9 in Jurkat cell lysate with TLR9 antibody at 1 μg/mL in (A) the absence and (B) the presence of blocking peptide

Western blot analysis of TLR9 in Jurkat cell lysate with TLR9 antibody at 1 μg/mL in (A) the absence and (B) the presence of blocking peptide

Anti-Toll-like receptor 9 TLR9 Antibody

Cat # A00198-2

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Real WB data Western blot analysis of TLR9 expression in Raji cell lysate.

Anti-TLR9 Rabbit Monoclonal Antibody

Cat # M00198

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Real WB data Western blot analysis of TLR9 in mouse spleen cell lysate with TLR9 antibody at (A) 0.5 and (B) 1 μg/mL.

Anti-Toll-like receptor 9 TLR9 Antibody

Cat # A00198-1

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All four listed anti-TLR9 antibodies have Western blot images. The captions show human cell lysates, rat thymus lysate, or mouse spleen lysate, depending on the antibody. These examples document the tested samples; they do not establish performance across every listed species or tissue.

Which to pick: For the closest shown sample, choose A00198-3 for human cell lines or rat thymus, A00198-1 for mouse spleen, or M00198 for Raji cells. A00198-2 shows a Jurkat blot with a blocking-peptide comparison; its listed mouse and rat reactivity is not pictured.

Source: BosterBio TLR9 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.

References

UniProt Consortium. UniProt entry Q9NR96.
Human Protein Atlas. TLR9 tissue expression.
PMC12607686 — target-verified WB comparison
PMC6856438 — target-verified WB comparison
PMC3379887 — target-verified WB comparison