Recombinant Human FAM3B Protein (Fc Tag)

Beta LifeScience SKU/CAT #: BLPSN-1977

Recombinant Human FAM3B Protein (Fc Tag)

Beta LifeScience SKU/CAT #: BLPSN-1977
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Product Overview

Tag Fc
Host Species Human
Accession P58499
Synonym 42056, C21orf11, C21orf76, ORF9, PANDER, PRED44
Background Pancreatic derived factor, also known as FAM3B, is an islet-specific secreted cytokine specifically expressed at high levels in the islets of Langerhans of the endocrine pancreas. FAM3B protein is present in alpha- and beta- cells of pancreatic islets, insulin-secreting beta-TC3 cells, and glucagon-secreting alpha-TC cells. FAM3B causes apoptosis of beta-cells as assessed by electron microscopy, annexin -…¤ fluorescent staining, and flow-cytometric terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling assay. FAM3B activated caspase-3 while not affect cytosolic Ca2+ levels or nitric oxide levels. Hense, FAM3B may have a role in the process of pancreatic?-cell apoptosis of primary islet and cell lines. FAM3B secretion is regulated by glucose and other insulin secretagogues. This islet-specific secreted cytokine is secreted from both pancreatic alpha- and beta- cells. Glucose stimulates FAM3B secretion dose dependently in beta- cell lines and primary islets but not in alpha-cells. It is likely cosecreted with insulin via the same regulatory mechanisms and structure and conformation is vital for FAM3B secretion.
Description A DNA sequence encoding the human FAM3B isoform B (P58499-1) (Met 1-Ser 235) was fused with the Fc region of human IgG1 at the C-terminus.
Source HEK293
Predicted N Terminal Glu 30
AA Sequence Met 1-Ser 235
Molecular Weight The secreted recombinant human FAM3B/Fc is a disulfide-linked homodimeric protein. The reduced monomer consists of 447 a.a. and has a predicted molecular mass of 50 kDa. The apparent molecular mass of rhFAM3B/Fc monomer is approximately 57 kDa in SDS-PAGE under reducing conditions.
Purity >95% as determined by SDS-PAGE
Endotoxin < 1.0 EU per μg of the protein as determined by the LAL method
Bioactivity Please contact us for detailed information
Formulation Lyophilized from sterile PBS, pH 7.4.
Stability The recombinant proteins are stable for up to 1 year from date of receipt at -70°C.
Usage For Research Use Only
Storage Store the protein under sterile conditions at -20°C to -80°C. It is recommended that the protein be aliquoted for optimal storage. Avoid repeated freeze-thaw cycles.

Target Details

Target Function Induces apoptosis of alpha and beta cells in a dose- and time-dependent manner.
Subcellular Location Secreted. Note=Present in insulin secretory granules and likely cosecreted with insulin. Localized in discrete vesicular and perinuclear structure.
Protein Families FAM3 family
Database References
Tissue Specificity Highly expressed in the pancreas. Also found in the colon, kidney, prostate, small intestine and testis.

Gene Functions References

  1. Taken together, by activating pro-survival mechanisms FAM3B overexpression contributes to increased resistance to cell death and tumor growth in nude mice, highlighting a putative role for this cytokine in prostate cancer progression. PMID: 29357840
  2. FAM3B overexpression contributes to increased resistance to cell death and tumor growth in nude mice. PMID: 29357840
  3. Data suggest that serum PANDER levels are significantly elevated in patients with long-standing type 2 diabetes as compared to patients with recently diagnosed type 2 diabetes and control subjects; serum PANDER levels vary according to degree of insulin resistance. PMID: 28161382
  4. Circulating level of pancreatic-derived factor (PANDER) in relation to the accumulation in metabolic syndrome suggested that persons with elevated levels of PANDER were associated with an increased risk of metabolic syndrome. PMID: 27181109
  5. in-vitro and in-vivo glucose is a potent stimulator of the PANDER promoter within the liver and this response may be facilitated by ChREBP. PMID: 26123584
  6. beta-cell-secreted PANDER regulated the hepatic insulin and lipogenenic signaling and impact overall glycemia. PMID: 24468680
  7. It is an important regulator of glucose and lipid metabolism and plays a role in the pathogenesis of nonalcoholic fatty liver disease.(review) PMID: 23855304
  8. our studies demonstrated that silencing FAM3B promoted p53 phosphorylation and induced p53 accumulation by decreasing Mdm2 expression, which resulted in apoptotic cell death. PMID: 23246487
  9. These results suggest that FAM3B-258 promotes colon cancer cell invasion and metastasis through upregulation of Slug. PMID: 23059759
  10. Localized to the islets of Langerhans. PMID: 12160727
  11. Helices B and C and the second disulfide bond of PANDER are essential for PANDER-induced beta-cell death. PMID: 16114871
  12. PANDER is secreted from 2 types of pancreatic cells, glucose stimulates its secretion in beta cell and primary islets but not in alpha-cells, it is likely cosecreted with insulin, and structure and conformation is vital for PANDER secretion. PMID: 16249448


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Proteins are sensitive to heat, and freeze-drying can preserve the activity of the majority of proteins. It improves protein stability, extends storage time, and reduces shipping costs. However, freeze-drying can also lead to the loss of the active portion of the protein and cause aggregation and denaturation issues. Nonetheless, these adverse effects can be minimized by incorporating protective agents such as stabilizers, additives, and excipients, and by carefully controlling various lyophilization conditions.

Commonly used protectant include saccharides, polyols, polymers, surfactants, some proteins and amino acids etc. We usually add 8% (mass ratio by volume) of trehalose and mannitol as lyoprotectant. Trehalose can significantly prevent the alter of the protein secondary structure, the extension and aggregation of proteins during freeze-drying process; mannitol is also a universal applied protectant and fillers, which can reduce the aggregation of certain proteins after lyophilization.

Our protein products do not contain carrier protein or other additives (such as bovine serum albumin (BSA), human serum albumin (HSA) and sucrose, etc., and when lyophilized with the solution with the lowest salt content, they often cannot form A white grid structure, but a small amount of protein is deposited in the tube during the freeze-drying process, forming a thin or invisible transparent protein layer.

Reminder: Before opening the tube cap, we recommend that you quickly centrifuge for 20-30 seconds in a small centrifuge, so that the protein attached to the tube cap or the tube wall can be aggregated at the bottom of the tube. Our quality control procedures ensure that each tube contains the correct amount of protein, and although sometimes you can't see the protein powder, the amount of protein in the tube is still very precise.

To learn more about how to properly dissolve the lyophilized recombinant protein, please visit Lyophilization FAQs.

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