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- Table of Contents
STAR · Western blot design guide
STAR Western Blot Planning Guide
Plan a STAR Western blot around the catalog-observed 123.4 kDa band, image-backed A00051-1 evidence, HPA controls, and verified protocol records.
Evidence assembled July 2026 · For research use; verify linked source records and product datasheet before use
STAR Western Blot Experimental Design Guide
Expected bands, documented protocol parameters, controls and antibodies — the at-a-glance facts below, then the full design guide.
Must know before running
| Expected band | 123.4 kDa | |
| Observed band | Not reported — verify product WB image | |
| Gel | 8-10% | |
| Positive control | Adrenal gland | |
| Negative control | Appendix |
Important caveats
Reasons your observed band may differ from the expected size.
| ⓘ | Calculated mass | 123.4 kDa |
| ⓘ | Localization | Cell membrane / Endoplasmic reticulum membrane |
| ⓘ | Processing / PTM | Record-dependent |
| ⓘ | Reactivity | Human / Mouse / Rat |
Section 1
Real Curated STAR Western Blot Protocols
Start with the molecular-weight rule, then compare verified publication-derived conditions.
| Sample / lysate | Adrenal gland |
| Gel % | 8-10% |
| Load | 20-30 µg total protein per lane |
| Transfer | Wet/tank, extended transfer |
| Membrane | 0.45 µm PVDF |
| Blocking | 5% non-fat milk or 5% BSA in TBST |
| Primary | A00051-1 at datasheet starting dilution |
| Primary incubation | Overnight at 4 °C with gentle agitation |
| Secondary | Species-matched HRP conjugate at validated dilution |
| Wash | 3 × 5 min in TBST |
| Detection | Chemiluminescent substrate |
| Exposure | Bracket exposures to avoid saturation |
Section 2
What Is the Expected STAR Western Blot Band Size?
Use the product-observed 123.4 kDa band as the primary planning value and retain the UniProt calculated mass as context.
| 123.4 kDa | Matches the authoritative product WB observation. |
| 123.4 kDa calculated | Use as UniProt context, not as a replacement observed band. |
| Unexpected additional signal | Do not assign identity without orthogonal positive/negative controls. |
💡Expected STAR appearancePlan around 123.4 kDa and keep the calculated mass as supporting context.
| Catalog-observed band | 123.4 kDa; use this as the primary experimental expectation. |
| Calculated mass | 123.4 kDa from UniProt P25092; retain as context. |
| Gel selection | 8-10%; shared with the recommended protocol and poster. |
| Specificity check | Compare the lead HPA positive and negative controls with A00051-1. |
| Situation | Likely cause | Next action |
|---|---|---|
| 123.4 kDa | Matches the authoritative product WB observation. | Confirm with orthogonal controls and the linked product record. |
| Additional band | May reflect processing, modification, or non-specific signal. | Run a dilution series and compare positive/negative controls. |
| Weak signal | Target abundance or transfer may be limiting. | Verify transfer, increase positive-control abundance, and bracket exposure. |
Experiment evidence
Western blot images showing STAR band
A00051-1 · STAR
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for STAR Western blot
🧪Use Adrenal gland as the first positive-control candidate and Appendix as the HPA Not detected negative candidate.
Positive control: Adrenal gland (High)
Negative control: Appendix (Not detected)
HPA protein score determines control status; other expression data is supporting context only.
HPA tissue expression evidence for STAR
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.
Section 3
Advanced STAR Western Blot Tips
Deeper troubleshooting and optimisation questions for STAR, answered from its protein features.
Which band should guide the blot?
Use 123.4 kDa, the observation attached to the authoritative A00051-1 WB record.
How should calculated mass be interpreted?
Treat the UniProt calculated mass as context; it does not replace the catalog-observed 123.4 kDa expectation.
Which positive control should I start with?
Start with Adrenal gland, the lead HPA protein-expression candidate.
Which negative control is defensible?
Use Appendix as an orthogonal HPA Not detected candidate.
Which gel should I use?
Use 8-10% consistently across the quick facts, protocol table, and poster.
What transfer method to use for STAR Western blot?
Use the transfer method in the recommended protocol and verify transfer before blocking.
How should A00051-1 be started?
Start at the linked datasheet condition and run a three-point primary-antibody dilution test.
Which publication-derived protocols can I compare?
No verified publication protocol was supplied; use only the deterministic recommended protocol.
Boster reagents
STAR Western Blot Reagents
Human/Mouse/Rat-reactive STAR Western blot reagents with authoritative product imagery.
Real WB data
Anti-StAR Antibody Picoband®
Cat # A00051-1
Only image-backed, WB-validated Human/Mouse/Rat recommendations from the prepared catalog evidence are shown.
Source: prepared picoband-wb product evidence; each card retains its own SKU, URL, observed band, and authoritative WB image.
References
- UniProt P25092
- Human Protein Atlas — STAR
- A00051-1 product record
- PMC7922663 — Role of Constitutive STAR in Leydig Cells (International journal of molecular sciences, 2021)
- PMC11545013 — Elevated RBP4 in Subclinical Ketosis Cows Inhibits Follicular Granulosa Cell Proliferation and Steroid Hormone Synthesis (Animals : an open access journal from MDPI, 2024)
- PMC6787510 — Cyclophilin D participates in the inhibitory effect of high-fat diet on the expression of steroidogenic acute regulatory protein (Journal of cellular and molecular medicine, 2019)