GALP / Galanin-like peptide · Western blot design guide

Design a Western Blot for GALP

Source-linked GALP Western blot protocol options, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-GALP 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 GALP: expected band ~12.5 kDa, hero antibody A04786-1, catalog values and labelled standard workflow; separate PMC comparisons on the guide — Printable **GALP** Western blot protocol sheet — expected band ~12.5 kDa, antibody A04786-1, controls and PMC citations. Open the full GALP WB guide →

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GALP 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	~12.5 kDa
	Observed band	~15, 18 kDa
	Gel	5–20% (catalog A04786-1)
	Negative control ⓘ	Suggested KO / knockdown lysate

Important caveats

Reasons your observed band may differ from the expected size.

	PTM	Cleaved
	Caveat	Processing-state controls
	Gene-set association	MSigDB C7 membership
	Isoform	2 isoform(s)

Section 1

Source-Linked GALP Western Blot Protocol Options

The A04786-1 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	human SH-SY5Y, human placenta, rat brain, rat liver, rat C6, mouse brain, mouse liver (catalog A04786-1)
Gel %	5–20% (catalog A04786-1)
Load	30 ug; reducing conditions (catalog A04786-1)
Transfer	a nitrocellulose membrane at 150 mA for 50-90 minutes (catalog A04786-1)
Membrane	nitrocellulose membrane (catalog A04786-1)
Blocking	5% non-fat milk/TBS for 1.5 hour at RT (catalog A04786-1)
Primary antibody	A04786-1 · 0.25 μg/mL (catalog A04786-1)
Primary incubation	overnight at 4°C (catalog A04786-1)
Secondary antibody	goat anti-rabbit IgG-HRP, 1:5000 (catalog A04786-1)
Secondary incubation	1.5 hour at RT (catalog A04786-1)
Wash	TBS-0.1%Tween 3 times with 5 minutes each (catalog A04786-1)
Detection	ECL (catalog A04786-1)

Section 2

What Is the Expected GALP Western Blot Band Size?

GALP is predicted at 12.5 kDa; empirical bands occur near 15 and 18 kDa, and the cause of that difference is not established.

What am I looking at on my blot?
Bands near 15 and 18 kDa	Empirical GALP antibody signals; their identities require confirmation
Band near 12.5 kDa	Compatible with the predicted precursor mass
Band below the precursor size	Could reflect signal peptide or propeptide cleavage
Little or no band in whole-cell lysate	GALP is secreted
Multiple bands	Isoforms 1 and 2 or processing are possible, but distinct migration is unproven

💡Expected GALP appearanceGALP has a predicted precursor mass of 12.5 kDa, while antibody QC reports bands near 15 and 18 kDa; confirm their identities with antibody and sample controls.

How each factor affects band size
Predicted precursor mass	12.5 kDa is the sequence-based reference; empirical bands occur near 15 and 18 kDa for unestablished reasons
Signal peptide at residues 1–24	Cleavage can yield a smaller product than the precursor
Propeptide at residues 87–116	Cleavage can yield a smaller product than the precursor
Splice isoforms 1 and 2	Sequence differences may affect size, but relative masses and distinct migration are not supplied

Why is my band missing or off?
Situation	Likely cause	Next action
No band in lysate	Secreted GALP may be scarce in the cell fraction	Check conditioned medium or an appropriate secreted-protein fraction
Band higher than expected	The cause of the reported 15 and 18 kDa signals relative to 12.5 kDa is unestablished	Check the size marker and validate band identity with an independent antibody or GALP depletion
Band lower than expected	Signal peptide or propeptide cleavage may produce smaller GALP species	Compare antibodies against retained and cleaved regions
Multiple bands	Isoforms or processing are possible, but neither is assigned to the observed bands	Test band identity with GALP depletion and region-specific antibodies
Weak or no signal	Secreted GALP may be low in the tested fraction	Check sample fraction and include a validated positive control
Fragments below expected size	GALP is a processed peptide precursor	Check epitope location and compare freshly prepared samples with protease-protected samples

Source: UniProt Q9UBC7 Human Protein Atlas product datasheet (A04786-1)

Experiment evidence

Western blot images showing GALP band

A04786-1 · GALP

← swipe / scroll for more images →

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

Sample controls for GALP Western blot

🧪For positive controls for GALP in Western blot, you can use conditioned medium from a verified GALP-expressing source; HPA identifies no specific positive tissue or cell line.

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: GALP is secreted, so conditioned medium may provide a better signal than whole-cell lysate.

HPA tissue expression evidence for GALP

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 GALP Western Blot Tips

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

How should GALP 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.

How could isoform 2 affect GALP band detection?

Isoforms · Isoform 2 replaces canonical residues 30..115 with SSTFPKWVTKTERGRQPLR, using UniProt coordinates. An antibody recognizing the replaced canonical region may miss isoform 2. Check the antibody epitope against both sequences before interpreting a missing or additional band.

Do listed GALP modifications explain the 15 and 18 kDa bands?

PTM · No glycosylation sites or modified residues are listed in the supplied UniProt features. Do not assign the observed approximately 15 and 18 kDa bands to a specific modification from these data. Verify band identity experimentally before treating either band as a modified form.

Does this guide establish induction of GALP?

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 GALP Western blot?

Transfer · Choose a transfer setup validated to retain small proteins and peptides, then verify recovery on the membrane. GALP is predicted at 12.5 kDa and has a signal peptide and propeptide; processed forms may be smaller. UniProt does not specify a transfer method.

How should blocking be optimized?

Blocking · Standard workflow guidance: follow the A04786-1 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 GALP bands be quantified?

Quantitation · GALP is secreted, so measure the sample fraction that contains the signal of interest and keep that fraction consistent across samples. Quantify distinct bands separately unless their identities have been established; the listed processing regions and two isoforms leave multiple possible sources of signal.

Why might GALP bands differ from its predicted 12.5 kDa mass?

Interpretation · The 12.5 kDa prediction is for the 116-residue canonical sequence. UniProt lists a signal peptide at residues 1..24 and a propeptide at 87..116, so processed GALP may differ in size. These features alone do not explain the observed approximately 15 and 18 kDa bands.

UniProt lists a signal peptide at 1..24, a propeptide at 87..116, and cleavage on pairs of basic residues. Map the antibody epitope against these regions before assigning bands to GALP forms. The features do not establish which forms are present on a blot.

Check whether each band is consistent with the two listed isoforms, the signal peptide at 1..24, and the propeptide at 87..116. Compare the antibody epitope with each candidate form. None of these features alone identifies an unexpected band or proves a visible shift.

Boster reagents

GALP 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 GALP using anti-GALP antibody (A04786-1). 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 SH-SY5Y whole cell lysates, Lane 2: human placenta tissue lysates, Lane 3: rat brain tissue lysates, Lane 4: rat liver tissue lysates, Lane 5: rat C6 whole cell lysates, Lane 6: mouse brain tissue lysates, Lane 7: mouse liver 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-GALP antigen affinity purified polyclonal antibody (Catalog # A04786-1) at 0.25 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 GALP at approximately 15,18 kDa. The expected band size for GALP is at 13 kDa.

Anti-GALP Antibody Picoband®

Cat # A04786-1

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the supplier A04786-1 has a Western blot image using human, rat, and mouse cell or tissue lysates. The caption reports GALP bands near 15 and 18 kDa, compared with an expected 13 kDa; these examples do not establish performance in every sample.

Which to pick: A04786-1 is the only listed option. Its stated reactivity is human, mouse, and rat, and its Western blot image includes samples from each. Check the reported 15 and 18 kDa bands against the expected 13 kDa when interpreting results.

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

References

UniProt Consortium. UniProt entry Q9UBC7.
Human Protein Atlas. GALP tissue expression.
PMC9092380 — target-verified WB comparison