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- Table of Contents
DDC / Aromatic-L-amino-acid decarboxylase · Western blot design guide
Design a Western Blot for DDC
Real validated DDC Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-DDC 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
DDC 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 | ~53.9 kDa | |
| Gel | 12–15% (standard starting point) | |
| Positive control | Appendix (IHC candidate; verify WB) +4 more | |
| Negative control | Adipose tissue (IHC candidate; verify WB) |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Acetylated | |
| Caveat | Band size unreported | |
| Gene-set association | MSigDB Hallmark membership | |
| Isoform | 4 isoform(s) |
Section 1
Real Curated DDC Western Blot Protocols
The A01374 protocol combines labelled catalog values with standard starting conditions. Published comparisons retain their own sample, reagent and detection scope.
| Sample / lysate | human lung tissue lysate (catalog A01374) |
| Gel % | 12–15% (standard starting point) |
| Load | 20–30 µg total protein per lane; optimize for abundance (standard starting point) |
| Transfer | Standard semi-dry transfer; verify efficiency (standard starting point) |
| Membrane | 0.45 µm PVDF (standard starting point) |
| Blocking | 5% milk or 5% BSA in TBST (standard starting point) |
| Primary antibody | A01374 · (A) 0.5 and (B) 1 μg/ml (catalog A01374) |
| Primary incubation | Overnight at 4 °C (standard starting point) |
| Secondary antibody | Species-matched HRP conjugate at validated dilution (standard starting point) |
| Secondary incubation | 1 h at room temperature (standard starting point) |
| Wash | 3 × 5 min in TBST (standard starting point) |
| Detection | ECL; bracket exposures to avoid saturation (standard starting point) |
Section 2
What Is the Expected DDC Western Blot Band Size?
DDC has a predicted 53.9 kDa monomer; homodimer formation and splice isoforms could affect bands, but their electrophoretic migration is unverified.
| Band near 53.9 kDa | Consistent with the predicted DDC monomer; identity requires controls. |
| Band near 108 kDa under nonreducing conditions | Could reflect the reported DDC homodimer; its migration is not established. |
| Bands at different monomer positions | Could reflect isoforms 1, 2, 3, and 4, but distinct migration is unverified. |
| Bands near both 53.9 and 108 kDa | Could reflect monomer and retained homodimer; confirm band identity. |
💡Expected DDC appearanceThe predicted DDC monomer is 53.9 kDa; no empirical band size is supplied, so confirm any band near that position with appropriate identity controls.
| Predicted DDC monomer mass | Provides a 53.9 kDa reference, not a measured Western blot position. |
| DDC homodimer | May appear near twice the monomer mass if retained during electrophoresis; migration is unverified. |
| Splice isoform 1 | Its size relative to the other named isoforms is not supplied. |
| Splice isoform 2 | Its size relative to the other named isoforms is not supplied. |
| Splice isoform 3 | Its size relative to the other named isoforms is not supplied. |
| Splice isoform 4 | Its size relative to the other named isoforms is not supplied. |
| Situation | Likely cause | Next action |
|---|---|---|
| Band higher than expected | Retained DDC homodimer is possible; a measured dimer band is not supplied. | Compare reducing and nonreducing samples and confirm identity with an independent antibody. |
| Band lower than expected | A smaller splice isoform is possible, but isoform masses are not supplied. | Check isoform expression and confirm the band with an independent antibody. |
| Multiple bands | Splice isoforms or retained homodimer are possible; distinct isoform bands are unverified. | Compare reducing conditions and use an independent antibody or isoform-specific controls. |
| Weak or no signal | DDC abundance or antibody detection may be insufficient in the tested lysate. | Check loading and antibody performance with a DDC-positive control. |
| Broad smear instead of sharp band | Sample degradation or nonspecific detection is possible; no glycosylation sites are listed. | Check sample integrity and compare with a DDC-positive control and an independent antibody. |
Experiment evidence
Western blot images showing DDC band
A01374 · DDC
M01374-1 · DDC
A01374-2 · DDC
A01374-2 · DDC
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for DDC Western blot
🧪HPA-IHC candidate guidance (verify in WB): For positive controls for DDC in Western blot, you can use appendix tissue lysate, which HPA scores High.
Positive control: Appendix (IHC candidate; verify WB)
Negative control: Adipose tissue (IHC candidate; verify WB)
Loading controls: Run GAPDH, β-actin, and a total-protein stain such as Ponceau alongside the samples.
⚠️Feasibility: HPA reports a Not detected tissue, so a tissue negative control is feasible.
HPA tissue expression evidence for DDC
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 |
|---|---|---|---|---|
| Appendix | endocrine cells | High | Protein (IHC) | HPA → |
| Cerebellum | molecular layer - neuropil | High | Protein (IHC) | HPA → |
| Colon | endocrine cells | High | Protein (IHC) | HPA → |
| Duodenum | endocrine cells | High | Protein (IHC) | HPA → |
| Kidney | proximal tubules (cell body) | High | Protein (IHC) | HPA → |
Lower expression tissues · IHC evidence, not confirmed WB-negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Adipose tissue | adipocytes | Not detected | Protein (IHC) | HPA → |
| Bone marrow | hematopoietic cells | Not detected | Protein (IHC) | HPA → |
| Caudate | glial cells | Not detected | Protein (IHC) | HPA → |
| Cerebral cortex | endothelial cells | Not detected | Protein (IHC) | HPA → |
| Cervix | glandular cells | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced DDC Western Blot Tips
Deeper troubleshooting and optimisation questions for DDC, answered from its protein features.
How should DDC 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 DDC isoforms produce different bands?
Isoforms · UniProt lists four isoforms. Relative to the 480-residue canonical sequence, isoform 3 lacks residues 68–145, isoform 4 lacks 146–238, and isoform 2 has a substitution at 316–338 and lacks 339–480. These differences could affect migration, but the features do not establish which bands will be visible.
Check its epitope against the listed alternative sequences. Residues 68–145 are absent from isoform 3, 146–238 from isoform 4, and 339–480 from isoform 2; residues 316–338 differ in isoform 2. An antibody targeting one of those regions may miss an isoform.
Check its epitope against the listed alternative sequences. Residues 68–145 are absent from isoform 3, 146–238 from isoform 4, and 339–480 from isoform 2; residues 316–338 differ in isoform 2. An antibody targeting one of those regions may miss an isoform.
Which DDC modifications matter when interpreting a band shift?
PTM · UniProt lists N-acetylmethionine at position 1 and N6-(pyridoxal phosphate)lysine at position 303, using canonical sequence numbering. Neither feature alone demonstrates a visible Western blot shift.
Does this guide establish induction of DDC?
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 DDC?
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 A01374 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 multiple DDC bands be quantified?
Quantitation · Report each verified band separately, with its apparent size and the antibody epitope. The four listed isoforms can differ in sequence, so a single band may not represent total DDC. Confirm which isoforms the antibody can detect before combining band intensities.
Should DDC migrate at its predicted 53.9 kDa?
Interpretation · Use 53.9 kDa as the reference for canonical DDC. No observed band size is supplied, and the listed features do not establish a visible shift or explain any difference from the calculated mass.
Compare its apparent size with the listed isoform deletions: 68–145 in isoform 3, 146–238 in isoform 4, and 339–480 in isoform 2. Check that the antibody epitope remains in the proposed isoform. A lower band alone does not identify an isoform.
UniProt describes DDC as a homodimer, but that feature alone does not establish a dimer band on a Western blot. Verify the higher band's identity before assigning it to DDC.
Compare its apparent size with the listed isoform deletions: 68–145 in isoform 3, 146–238 in isoform 4, and 339–480 in isoform 2. Check that the antibody epitope remains in the proposed isoform. A lower band alone does not identify an isoform.
UniProt describes DDC as a homodimer, but that feature alone does not establish a dimer band on a Western blot. Verify the higher band's identity before assigning it to DDC.
Boster reagents
DDC 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
Anti-DDC Antibody
Cat # A01374
Real WB data
Anti-DOPA Decarboxylase Rabbit Monoclonal Antibody
Cat # M01374-1
Real WB data
Anti-DOPA decarboxylase/DDC Antibody Picoband®
Cat # A01374-2
Three the supplier anti-DDC antibodies list Human, Mouse, and Rat reactivity and have Western blot images. Their captions document selected tissue or cell lysates; these examples do not establish performance across all specimens or conditions.
Which to pick: Choose A01374 for a human lung tissue example (0.5 or 1 μg/mL), M01374-1 for 293T or RAW 264.7 lysate examples, or A01374-2 for a six-lane human, rat, and mouse example at 0.5 μg/mL.
Source: BosterBio DDC gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry P20711.
- Human Protein Atlas. DDC tissue expression.
- PMC3656962 — target-verified WB comparison
- PMC7765554 — target-verified WB comparison
- PMC6721762 — target-verified WB comparison