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Recombinant Mouse IGFBP-rp1/IGFBP-7 Protein, CF

Catalog # 2120-B7 | R&D Systems, Inc. a Bio-Techne Brand
Catalog #
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Key Product Details

Accession #


Sf 21 (stably transfected)




Binding Activity

Product Specifications


Spodoptera frugiperda, Sf 21 (stably transfected)-derived mouse IGFBP-rp1/IGFBP-7 protein
Ser28-Leu281, with an N-terminal 10-His tag


>97%, by SDS-PAGE under reducing conditions and visualized by silver stain.

Endotoxin Level

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

N-terminal Sequence Analysis


Predicted Molecular Mass

27.5 kDa


35 kDa, reducing conditions


Measured by its ability to bind 6Ckine/CCL21 in a functional ELISA. Nagakubo, D. et al. (2003) J. Immunol. 171:553.
When Recombinant Mouse IGFBP-rp1/IGFBP-7 is immobilized at 500 ng/mL (100 µL/well), the concentration of Recombinant Human CCL21/6Ckine (Catalog # 366-6C) that produces 50% optimal binding response is found to be 1.5-12 ng/mL.

Formulation, Preparation and Storage

Formulation Lyophilized from a 0.2 μm filtered solution in PBS and NaCl.
Reconstitute at 100 μg/mL in sterile PBS.

Reconstitution Buffer Available:
Size / Price
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: IGFBP-rp1/IGFBP-7

Insulin-like growth factor (IGF) binding protein-related protein 1 (IGFBP-rp1), also known as IGF binding protein-7 (IGFBP-7) and Mac25 is a 31 - 37 kDa secreted glycoprotein that belongs to the IGFBP superfamily of molecules (1, 2). Members of this superfamily are characterized by the presence of 10 ‑ 12 conserved cysteines in the first third of the molecule, and the partial conservation of an xCGCCxxC octapeptide motif that exists in an N‑terminal IGFBP domain (1, 3). Mouse IGFBP-7 cDNA encodes a 281 amino acid (aa) precursor protein that contains a putative 25 aa signal peptide and a 256 aa mature region. The mature protein contains an N‑terminal 43 aa IGFBP domain that is followed by a 52 aa Kazal-type serine proteinase inhibitor domain and a 105 aa C-terminal Ig-like C2‑type domain (4, 5). The molecule is known to contain about 4 kDa of carbohydrate and believed to undergo phosphorylation (6). Mature mouse IGFBP-7 is 95% and 91% aa identical to mature rat and human IGFBP-7, respectively. Cells known to express IGFBP-7 include osteoblasts, select skeletal muscle fibers, visceral and vascular smooth muscle cells, breast epithelium, ciliated epithelium, renal tubular epithelium, astrocytes and oligodendroglia, and vascular endothelium in all tissues except brain (7). IGFBP-7 will bind both IGF-I and insulin, albeit at low affinity. When bound to IGF-I, it participates in growth promoting effects (8). Alternatively, IGFBP-7 by itself is an inhibitor of cell proliferation (6). Thus, its function is unclear. It is known to bind heparin, syndecan-1 and chemokines (8, 9). Based on human studies and aa conservation in relevant regions, mouse IGFBP-7 might be be expected to undergo proteolytic cleavage extracellularly (8). This will create an 8 kDa, 72 aa subunit (containing the IGFBP domain) that is disulfide-linked to a 25 kDa, 184 aa C-terminal subunit. Cleavage will reduce IGF‑I bonding activity and the promotion of IGF‑dependent cell proliferation.


  1. Hwa, V. et al. (1999) Endocr. Rev. 20:761. 
  2. Kim, H-S. et al. (1997) Proc. Natl. Acad. Sci. USA 94:12981. 
  3. Oh, Y. et al. (1996) J. Biol. Chem. 271:30322. 
  4. Kato, M.V. et al. (1996) Oncogene 12:1361. 
  5. Kato, M.V. (2000) Mol. Med. 6:126.
  6. Wilson, H-M. et al. (2002) Cell Growth Differ. 13:205.
  7. Degeorges, A. et al. (2000) J. Histochem. Cytochem. 48:747.
  8. Ahmed, S. et al. (2003) Biochem. Biophys. Res. Commun. 310:612.
  9. Nagakubo, D. et al. (2003) J. Immunol. 171:553.

Long Name

Insulin-like Growth Factor Binding Protein Related Protein 1

Alternate Names


Entrez Gene IDs

3490 (Human); 29817 (Mouse)

Gene Symbol



Product Documents for Recombinant Mouse IGFBP-rp1/IGFBP-7 Protein, CF

Certificate of Analysis

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Product Specific Notices for Recombinant Mouse IGFBP-rp1/IGFBP-7 Protein, CF

For research use only

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