RASGRP1 / RAS guanyl-releasing protein 1 · Western blot design guide

Design a Western Blot for RASGRP1

Source-linked RASGRP1 Western blot protocol options, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-RASGRP1 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 RASGRP1: expected band ~90.4 kDa, hero antibody A03004-1, catalog values and labelled standard workflow; separate PMC comparisons on the guide — Printable **RASGRP1** Western blot protocol sheet — expected band ~90.4 kDa, antibody A03004-1, controls and PMC citations. Open the full RASGRP1 WB guide →

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RASGRP1 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	~90.4 kDa
	Observed band	~100 kDa
	Gel	5–20% (catalog A03004-1)
	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 Hallmark membership
	Isoform	5 isoform(s)

Section 1

Source-Linked RASGRP1 Western Blot Protocol Options

The A03004-1 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 Jurkat, human 293T, human U-87MG (catalog A03004-1)
Gel %	5–20% (catalog A03004-1)
Load	30 ug; reducing conditions (catalog A03004-1)
Transfer	a nitrocellulose membrane at 150 mA for 50-90 minutes (catalog A03004-1)
Membrane	nitrocellulose membrane (catalog A03004-1)
Blocking	5% non-fat milk/TBS for 1.5 hour at RT (catalog A03004-1)
Primary antibody	A03004-1 · 0.5 μg/mL (catalog A03004-1)
Primary incubation	overnight at 4°C (catalog A03004-1)
Secondary antibody	goat anti-rabbit IgG-HRP, 1:5000 (catalog A03004-1)
Secondary incubation	1.5 hour at RT (catalog A03004-1)
Wash	TBS-0.1%Tween 3 times with 5 minutes each (catalog A03004-1)
Detection	ECL (catalog A03004-1)

Section 2

What Is the Expected RASGRP1 Western Blot Band Size?

RASGRP1 is predicted at 90.4 kDa and observed at ~100 kDa in reducing lysates; the cause of the difference is not established.

What am I looking at on my blot?
Band at ~100 kDa	Empirical RASGRP1 band in reducing whole-cell lysates; confirm identity with band-identity controls
Band near 90.4 kDa	Near the predicted protein mass; identity requires confirmation
Band near twice the monomer size	Could reflect retained RASGRP1 homodimers under non-reducing conditions
Several bands at different sizes	Could include splice isoforms 1–5; distinct migration has not been established

💡Expected RASGRP1 appearanceRASGRP1 has a predicted mass of 90.4 kDa and an empirical band at ~100 kDa in reducing whole-cell lysates; the difference is unexplained, so confirm band identity with appropriate controls.

How each factor affects band size
UniProt predicted mass	90.4 kDa predicted; the empirical reducing-lysate band is ~100 kDa
RASGRP1 homodimer	May appear near twice the monomer size if retained during electrophoresis
Splice isoforms 1 and 2	May differ in apparent size; individual masses and migration are unreported
Splice isoforms 3, 4, and 5	May differ in apparent size; individual masses and migration are unreported

Why is my band missing or off?
Situation	Likely cause	Next action
No band in lysate	RASGRP1 may partition into membrane-associated fractions	Check a membrane-enriched fraction and include a positive lysate control
Band higher than expected	A retained homodimer is possible under non-reducing conditions; the ~100 kDa band has no established cause for its difference from 90.4 kDa	Compare reducing and non-reducing lanes and confirm identity with an independent antibody or knockdown
Band lower than expected	A splice isoform is possible, but its migration is unreported	Check isoform expression and confirm band identity with knockdown or an independent antibody
Multiple bands	Splice isoforms 1–5 are annotated, but distinct bands are unverified	Use isoform-aware controls or knockdown to identify the bands
Weak or no signal	RASGRP1 occurs in both cytosolic and membrane-associated pools	Compare cytosolic and membrane-enriched fractions with a positive lysate control

Source: UniProt O95267 Human Protein Atlas product datasheet (A03004-1)

Experiment evidence

Western blot images showing RASGRP1 band

A03004-1 · RASGRP1

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

Sample controls for RASGRP1 Western blot

🧪For positive controls for RASGRP1 in Western blot, you can use a sample with confirmed RASGRP1 expression; the supplied HPA evidence identifies no positive tissue or cell.

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: The supplied HPA evidence identifies no positive or negative tissue control, so sample expression must be verified independently.

HPA tissue expression evidence for RASGRP1

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 RASGRP1 Western Blot Tips

Deeper troubleshooting and optimisation questions for RASGRP1, answered from its protein features.

What should be checked when unexpected RASGRP1 bands appear?

Band shift · Check whether the antibody epitope is retained in the listed isoforms, particularly the shorter isoforms 3–5. UniProt also reports a homodimer, but that does not establish that a higher band will persist under Western-blot conditions. Use a specificity control before assigning any unexpected band to RASGRP1.

Which RASGRP1 isoforms could produce smaller bands?

Isoforms · UniProt lists five isoforms. Isoforms 2–5 lack canonical residues 442–476; isoforms 3, 4, and 5 also lack residues 633–797, 517–797, and 582–797, respectively. These deletions make smaller bands plausible. Antibody epitope location determines which isoforms it can detect.

How can PKC signaling affect a phospho-RASGRP1 blot?

PTM · UniProt identifies phosphothreonine at canonical Thr184, phosphorylated by PKC. Compare phospho-Thr184 signal with total RASGRP1 when assessing PKC-related conditions. The supplied features establish neither an induction protocol nor the size of any band shift.

Compare blocking conditions for phospho-Thr184 signal and background, then select the condition that gives the clearest specific band. UniProt identifies the PKC-modified site at canonical Thr184 but does not specify a blocking reagent.

Does this guide establish induction of RASGRP1?

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 RASGRP1 Western blot?

Transfer · Optimize transfer for the approximately 90–100 kDa target and check the membrane and post-transfer gel for recovery. The supplied features do not establish a preferred transfer method.

How should blocking be optimized?

Blocking · Standard workflow guidance: follow the A03004-1 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 RASGRP1 signals be quantified across cell fractions?

Quantitation · RASGRP1 occurs in cytosol and on cellular membranes, and UniProt notes relocalization to the cell membrane upon activation. Quantify comparable fractions separately with suitable fraction controls; a change in one fraction may reflect redistribution. For phospho-Thr184, also compare with total RASGRP1 in the same fraction.

Why might RASGRP1 appear near 100 kDa instead of 90.4 kDa?

Interpretation · The supplied blot reports an apparent band near 100 kDa, while the canonical sequence predicts 90.4 kDa. UniProt lists phosphorylation at Thr184, but that feature alone does not explain the difference. Confirm band identity with an appropriate specificity control.

Boster reagents

RASGRP1 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 RASGRP1 using anti-RASGRP1 antibody (A03004-1). 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 Jurkat whole cell lysates, Lane 2: human 293T whole cell lysates, Lane 3: human U-87MG whole cell 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-RASGRP1 antigen affinity purified polyclonal antibody (Catalog # A03004-1) 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 RASGRP1 at approximately 100 kDa. The expected band size for RASGRP1 is at 90 kDa.

Anti-RASGRP1 Antibody Picoband®

Cat # A03004-1

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The catalog reports one anti-RASGRP1 antibody for Western blotting, A03004-1, with human reactivity. Its blot shows a band near 100 kDa in Jurkat, 293T, and U-87MG whole-cell lysates; the stated expected size is 90 kDa. Evidence is limited to the supplied product image.

Which to pick: A03004-1 is the only listed option. Its WB image uses human Jurkat, 293T, and U-87MG whole-cell lysates under reducing conditions, with 30 µg per lane and 0.5 µg/mL primary antibody. Consider the observed 100 kDa band when interpreting results.

Source: BosterBio RASGRP1 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.

References

UniProt Consortium. UniProt entry O95267.
Human Protein Atlas. RASGRP1 tissue expression.
PMC4718016 — target-verified WB comparison
PMC13595488 — target-verified WB comparison
PMC7894479 — target-verified WB comparison