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Pack Size:100μg/vial
Validated Species:Human, Mouse, Rat
Application:IHC, WB
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Product Name Anti-Smad4 Antibody
SKU/Catalog Number PA1953
Description Rabbit IgG polyclonal antibody for Mothers against decapentaplegic homolog 4(SMAD4) detection. Tested with WB, IHC-P in Human;Mouse;Rat.
Cite This Product Anti-Smad4 Antibody (Boster Biological Technology, Pleasanton CA, USA, Catalog # PA1953)
Replacement Item This antibody may replace the following items: sc-7966|sc-56479|sc-56775|sc-1908|sc-7154|sc-73599|sc-1909|sc-73040|sc-1909-R|sc-7966-X|sc-1908-X|sc-7154-X|sc-1909-X from Santa Cruz Biotechnology.
Host Rabbit
Isotype N/A
Validated Species Human, Mouse, Rat
Predicted Species Chicken

*This antibody is predicted to react with the above species based on antigen sequence similarities. Our Boster Guarantee covers the use of this product with the above species.

Application IHC, WB

*Our Boster Guarantee covers the use of this product in the above tested applications.

**For positive and negative control design, consult "Tissue specificity" under Protein Target Info.

Recommended Detection Systems Boster recommends Enhanced Chemiluminescent Kit with anti-Rabbit IgG (EK1002) for Western blot, and HRP Conjugated anti-Rabbit IgG Super Vision Assay Kit (SV0002-1) for IHC(P).
*Blocking peptide can be purchased at $50. Contact us for more information
**Boster also offers various secondary antibodies for Immunoflourescecne and IHC. Take advantage of the buy 1 primary antibody get 1 secondary antibody for free promotion for the entire year 2018!
Immunogen A synthetic peptide corresponding to a sequence at the N-terminus of human Smad4(97-113aa RLWRWPDLHKNELKHVK), identical to the related rat and mouse sequences.
Cross Reactivity No cross reactivity with other proteins
Pack Size 100μg/vial


Clonality Polyclonal
Form Lyophilized
Contents Each vial contains 5mg BSA, 0.9mg NaCl, 0.2mg Na2HPO4, 0.05mg Thimerosal, 0.05mg NaN3.
Concentration Add 0.2ml of distilled water will yield a concentration of 500ug/ml.
Storage At -20°C for one year. After reconstitution, at 4°C for one month. It can also be aliquotted and stored frozen at -20°C for a longer time.Avoid repeated freezing and thawing.
Purification Immunogen affinity purified.
Isotype N/A

Protein Target Info (Source:

You can check the tissue specificity below for information on selecting positive and negative control.

Gene Name SMAD4
Protein Name Mothers against decapentaplegic homolog 4
Molecular Weight 60439 MW
Protein Function In muscle physiology, plays a central role in the balance between atrophy and hypertrophy. When recruited by MSTN, promotes atrophy response via phosphorylated SMAD2/4. MSTN decrease causes SMAD4 release and subsequent recruitment by the BMP pathway to promote hypertrophy via phosphorylated SMAD1/5/8. Acts synergistically with SMAD1 and YY1 in bone morphogenetic protein (BMP)-mediated cardiac-specific gene expression. Binds to SMAD binding elements (SBEs) (5'-GTCT/AGAC-3') within BMP response element (BMPRE) of cardiac activating regions (By similarity). Common SMAD (co-SMAD) is the coactivator and mediator of signal transduction by TGF-beta (transforming growth factor). Component of the heterotrimeric SMAD2/SMAD3-SMAD4 complex that forms in the nucleus and is required for the TGF-mediated signaling. Promotes binding of the SMAD2/SMAD4/FAST-1 complex to DNA and provides an activation function required for SMAD1 or SMAD2 to stimulate transcription. Component of the multimeric SMAD3/SMAD4/JUN/FOS complex which forms at the AP1 promoter site; required for synergistic transcriptional activity in response to TGF-beta. May act as a tumor suppressor. Positively regulates PDPK1 kinase activity by stimulating its dissociation from the 14-3-3 protein YWHAQ which acts as a negative regulator. .
Sequence Similarities Belongs to the dwarfin/SMAD family.
Subcellular Localization Cytoplasm. Nucleus. Cytoplasmic in the absence of ligand. Migrates to the nucleus when complexed with R- SMAD. PDPK1 prevents its nuclear translocation in response to TGF- beta.
Uniprot ID Q13485
Alternative Names Mothers against decapentaplegic homolog 4;MAD homolog 4;Mothers against DPP homolog 4;Deletion target in pancreatic carcinoma 4;SMAD family member 4;SMAD 4;Smad4;hSMAD4;SMAD4;DPC4, MADH4;
Research Areas |signal transduction|signaling pathway|nuclear signaling|smads| epigenetics and nuclear signaling|nuclear signaling pathways| stem cells|tgf beta|cytoplasmic| cancer|oncoproteins/suppressors|tumor suppressors| cardiovascular|heart|apoptosis|cardiogenesis|transcription factors/regulators|hypertrophy|transcription factors|vasculature|endothelium|cancer metabolism|response to hypoxia| metabolism|pathways and processes|metabolism processes|
*if product is indicated to react with multiple species, protein info is based on the human gene.

Background for Mothers against decapentaplegic homolog 4

SMAD4(Mothers Against Decapentaplegic Drosophila Homolog of 4), also known as MADH4 or DPC4, is a protein that in humans is encoded by the SMAD4 gene. It belongs to the Darfwin family of proteins that modulate members of the TGFbeta protein superfamily. Hahn et al.(1996) identified the SMAD4 gene on chromosome 18q21.1. Howe et al.(1998) identified the SMAD4 gene within a region on 18q21.1 defined by linkage analysis in a kindred with juvenile polyposis syndrome. To test directly the hypothesis that the SMAD4 gene is a tumor suppressor that is critical for transmitting signals from transforming growth factor-beta and related ligands. SMAD4 plays a pivotal role in signal transduction of the transforming growth factor beta superfamily cytokines by mediating transcriptional activation of target genes.

Anti-Smad4 Antibody Images

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Anti-Smad4 Antibody
Anti-Smad4 antibody, PA1953, Western blotting
Lane 1: Rat Skeletal Muscle Tissue Lysate
Lane 2: A549 Cell Lysate
Lane 3: U87 Cell Lysate
Anti-Smad4 Antibody
Anti-Smad4 antibody, PA1953, IHC(P)
IHC(P): Human Lung Cancer Tissue
Anti-Smad4 Antibody
Anti-Smad4 antibody, PA1953, IHC(P)
IHC(P): Rat Intestine Tissue
Anti-Smad4 Antibody
Anti-Smad4 antibody, PA1953, IHC(P)
IHC(P): Rat Intestine Tissue Lysate
Anti-Smad4 Antibody
Anti-Smad4 antibody, PA1953, IHC(P)
IHC(P): Rat Brain Tissue Lysate
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Customer Q&As

Q: Do you offer BSA-free antibodies? Keyword: Bovine serum albumin, carrier protein, conjugation
A: Yes, please contact us at for more information about BSA-free antibodies and availability. The new BSA-free formula uses trehalose as a replacement to BSA. We have tested many alternative chemicals and found that trehalose protects the antibodies the best.
Q: Is your western blot protocol provided from the website applicable for all your antibodies? Keyword: applications, WB
A: The protocol is applicable for all our antibodies in WB, the NC Membrane(0.45μm or 0.22μm) and transfer time(70 mins or 50 mins) depends on the protein molecular weight, details can be found in included protocol.
Q: Can I conjugate markers to this antibody? Can I link custom conjugates to this antibody? Keyword: conjugation
A: The antibody is stored with BSA and cannot be conjugated with markers. Carrier free antibodies are available upon request. Please contact
Q: What should I use for negative control?
A: Please contact us for negative control suggestions. You can also check expression databases such as genecards, uniprot etc. Due to logistic reasons, we do not sell serum or lysates that we use internally for positive or negative control.
Q: Where can I find troubleshooting information? What should I do if I have unexpected bands, high background, no signal, weak signal
A: You can find Boster's troubleshoot guides under tech support tab. Please contact us for further assistance on troubleshooting your experiment.
Q: What is the immunogen sequence of this antibody? Is this antibody polyclonal or monoclonal?
A: You can find the immunogen sequence under "Immunogen" and clonality in the product name.
Q: What is the expected band size? Why is it different than the observed band size?
A: The expected band size is predicted on the size of the protein. The actual band size may be affected by a few other factors including but not limited to:
1. Post-translational modification:phosphorylation, methylation, glycosylation etc. These modifications prevent SDS molecules from binding to the target protein and thus make the band size appear larger than expected
2. Post-translational cleavage: this can cause smaller bands and or multiple bands

3. Alternative splicing: the same gene can have alternative splicing patterns generating different size proteins, all with reactivities to the antibody.

4. Amino Acid R chain charge: SDS binds to positive charges. The different size and charge of the Amino Acid side chains can affect the amount of SDS binding and thus affect the observed band size.
5. Multimers: Multimers are usually broken up in reducing conditions. However if the interactions between the multimers are strong, the band may appear higher.,
Q: What is the suggested dilution ratio for Western Blot (WB), Immunohistochemistry (IHC) and or ELISA standards? What is the optimal pH for the sample?
A: Check the datasheet for the product for details on dilution ratios for different experiments. You can find the datasheet button on the right side of the product page.
Q: What is the protocol you used for your Western blotting (WB) and Immunohistochemistry (IHC)?
A: Check our protocols under the tech support tab.
Q: What are some alternative names that could be used to describe this product?
A: Some common names include but are not limited to smad4 antibody, dpc4 antibody