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Recombinant Human Endoglin/CD105 Protein

Bio-Techne includes R&D Systems | Catalog # 1097-EN

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Carrier Free
1097-EN-025/CF

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With Carrier
1097-EN-025

Key Product Details

Source

NS0

Accession #

Conjugate

Unconjugated

Applications

Bioactivity

Product Specifications

Source

Mouse myeloma cell line, NS0-derived human Endoglin/CD105 protein
Glu26-Gly586

Purity

>90%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.

Endotoxin Level

<1.0 EU per 1 μg of the protein by the LAL method.

N-terminal Sequence Analysis

Glu26

Predicted Molecular Mass

61 kDa

SDS-PAGE

75-85 kDa, reducing conditions

Activity

Measured by its ability to inhibit BMP-10-induced alkaline phosphatase production by MC3T3‑E1 mouse preosteoblast cells.
The ED50 for this effect is 0.06-0.36 μg/mL in the presence of 100 ng/mL of Recombinant Human BMP‑10 (Catalog # 2926-BP).

Formulation, Preparation and Storage

Carrier Free
What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.

Carrier: 1097-EN
Formulation Lyophilized from a 0.2 μm filtered solution in PBS with BSA as a carrier protein.
Reconstitution Reconstitute at 250 μg/mL in sterile PBS containing at least 0.1% human or bovine serum albumin.
Shipping The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.
Carrier Free: 1097-EN/CF
Formulation Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitution Reconstitute at 250 μg/mL in sterile PBS.
Shipping The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.

Background: Endoglin/CD105

Endoglin (CD105) is a 90 kDa type I transmembrane glycoprotein of the zona pellucida (ZP) family of proteins (1‑3). Endoglin and betaglycan/T betaRIII are type III receptors for TGF beta superfamily ligands, sharing 71% aa identity in the transmembrane (TM) and cytoplasmic domains. Endoglin is highly expressed on proliferating vascular endothelial cells, chondrocytes, and syncytiotrophoblasts of term placenta, with lower amounts on hematopoietic, mesenchymal and neural crest stem cells, activated monocytes, and lymphoid and myeloid leukemic cells (2 ‑ 5). Human endoglin cDNA encodes 658 amino acids (aa) including a 25 aa signal sequence, a 561 aa extracellular domain (ECD) with an orphan domain and a two‑part ZP domain, a TM domain and a 47 aa cytoplasmic domain (1‑3). An isoform with a 14 aa cytoplasmic domain (S‑endoglin) can oppose effects of long (L) endoglin (6, 7). The human endoglin ECD shares 65‑72% aa identity with mouse, rat, bovine, porcine and canine endoglin.  Endoglin homodimers interact with TGF‑ beta1 and TGF‑ beta3 (but not TGF‑ beta2), but only after binding T betaRII (8). Similarly, they interact with activin‑A and BMP‑7 via activin type IIA or B receptors, and with BMP‑2 via BMPR‑1A/ALK‑3 or BMPR‑1B/ALK‑6 (9). BMP‑9, however, is reported to bind endoglin directly (10). Endoglin modifies ligand‑induced signaling in multiple ways. For example, expression of endoglin can inhibit TGF‑ beta1 signals but enhance BMP7 signals in the same myoblast cell line (11). In endothelial cells, endoglin inhibits T betaRI/ALK5, but enhances ALK1‑mediated activation (12). Deletion of mouse endoglin causes lethal vascular and cardiovascular defects, and human endoglin haploinsufficiency can a cause the vascular disorder, hereditary hemorrhagic telangiectasia type I (13, 14). These abnormalities confirm the essential function of endoglin in differentiation of smooth muscle, angiogenesis, and neovascularization (2‑4, 12‑14).  In preeclampsia of pregnancy, high levels of proteolytically generated soluble endoglin and VEGF R1 (sFLT1), along with low placental growth factor (PlGF), are pathogenic due to antiangiogenic activity (15).

References

  1. Gougos, A. and Letarte, M. (1990) J. Biol. Chem. 265:8361.
  2. ten Dijke, P. et al. (2008) Angiogenesis 11:79.
  3. Bernabeu, C. et al. (2007) J. Cell. Biochem. 102:1375.
  4. Mancini, M.L. et al. (2007) Dev. Biol. 308:520.
  5. Moody, J.L. et al. (2007) Stem Cells 25:2809.
  6. Velasco, S. et al. (2008) J. Cell Sci. 121:913.
  7. Perez-Gomez, E. et al. (2005) Oncogene 24:4450.
  8. Cheifetz, S, et al. (1992) J. Biol. Chem. 267:19027.
  9. Barbara, N.P. et al. (1999) J. Biol. Chem. 274:584.
  10. Scharpfenecker, M. et al. (2007) J. Cell Sci. 120:964.
  11. Scherner, O. et al. (2007) J. Biol. Chem. 282:13934.
  12. Pece-Barbara, N. et al. (2005) J. Biol. Chem. 280:27800.
  13. Arthur, H.M. et al. (2000) Dev. Biol. 217:42.
  14. Lebrin, F. and C.L. Mummery (2008) Trends Cardiovasc. Med. 18:25.    
  15. Venkatesha, S. et al. (2006) Nat. Med. 12:642.

Alternate Names

CD105, ENG

Entrez Gene IDs

2022 (Human); 13805 (Mouse); 497010 (Rat)

Gene Symbol

ENG

UniProt

Additional Endoglin/CD105 Products

Product Documents for Recombinant Human Endoglin/CD105 Protein

Certificate of Analysis

To download a Certificate of Analysis, please enter a lot number in the search box below.

Note: Certificate of Analysis not available for kit components.

Product Specific Notices for Recombinant Human Endoglin/CD105 Protein

For research use only

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