Recombinant Mouse FGL2 Protein, CF


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Reactivity MuSpecies Glossary
Applications Bioactivity

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Recombinant Mouse FGL2 Protein, CF Summary

Details of Functionality
Measured by its ability to inhibit anti-CD3-induced proliferation of mouse splenic T lymphocytes. Chan, C.W. et al. (2003) J. Immunol. 170:4036. The soluble Recombinant Mouse FGL2 inhibited the proliferation with a typical ED50 value of 1-4 μg/mL.
Chinese Hamster Ovary cell line, CHO-derived mouse FGL2 protein
Val20-Pro432 & Asp31-Pro432 both with a C-terminal 6-His tag
Accession #
N-terminal Sequence
Val20 & Asp31
Structure / Form
Disulfide-linked homotetramer
Protein/Peptide Type
Recombinant Proteins
>90%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Endotoxin Note
<0.10 EU per 1 μg of the protein by the LAL method.


Theoretical MW
47.7 kDa (monomer).
Disclaimer note: The observed molecular weight of the protein may vary from the listed predicted molecular weight due to post translational modifications, post translation cleavages, relative charges, and other experimental factors.
55-80 kDa, reducing conditions
Read Publications using
5257-FL in the following applications:

Packaging, Storage & Formulations

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.
Lyophilized from a 0.2 μm filtered solution in PBS.
>90%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Reconstitution Instructions
Reconstitute at 200 μg/mL in sterile PBS.


This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.

Alternate Names for Recombinant Mouse FGL2 Protein, CF

  • FGL2
  • fibrinogen-like 2
  • Fibrinogen-like protein 2
  • Fibroleukin
  • pT49T49
  • T49


FGL2 (fibrinogen-like protein 2), also called fibroleukin, is a 64-70 kDa secreted glycoprotein of the Fibrinogen-like superfamily. It has prothrombinase activity and also promotes T regulatory (Treg) activity (1-6). The mouse FGL2 gene encodes a 432 amino acid (aa) protein that contains a 19 aa signal sequence and a 413 aa mature sequence with a coiled-coil region and a fibronectin C-terminal homology domain or FRED (1, 2). A 260-280 aa FGL2 complex is thought to be a tetramer formed by covalent disulfide linkage of dimers that are asoociated via coiled-coil interactions (2, 3). Mature mouse FGL2 shares 91% aa identity with rat FGL2, and 77-80% aa identity with human, equine, porcine, bovine and canine FGL2. FGL2 appears to have two modes of action. One mode involves its prothrombinase activity, which requires calcium and acidic phospholipids (4). This mode is thought to be active during hepatitis viral infections when FGL2, produced by macrophages in response to IFN-gamma, induces hepatic apoptosis and fibrin deposition (7). In addition, FGL2 produced by endothelial cells in response to TNF-alpha within cardiac xenografts or allografts promotes coagulation during acute vascular rejection (7-9). A second mode of action involves soluble (not phospholipid-associated) FGL2 and is independent of prothrombinase activity (2). Soluble FGL2 is required for Treg function, and directly suppresses DC, T, and B cell immune reactivity; consequently, some FGL2-deficent mice develop autoimmune glomerulonephritis (5, 6). In vitro, soluble FGL2 can skew T cell polarization toward Th2 and inhibit proliferation of stimulated T cells and maturation of DC (6). In pregnancy, fetal trophoblast cells secrete FGL2. The immune suppressive mode of FGL2 may prevent early fetal loss; however, the procoagulant mode is thought to mediate infection-triggered abortion (10).

  1. Koyama, T. et al. (1987) Proc. Natl. Acad. Sci. USA 84:1609.
  2. Marazzi, S. et al. (1998) J. Immunol.161:138.
  3. Olson, G. E. et al. (2004) J. Biol. Chem. 279:51266.
  4. Chan, C. W. Y. et al. (2002) J. Immunol. 168:5170.
  5. Shalev, I. et al. (2008) J. Immunol.180:249.
  6. Chan, C. W. Y. et al. (2003) J. Immunol. 170:4036.
  7. Liu, M. et al. (2006) J. Immunol. 176:7028.
  8. Mendicino, M. et al. (2005) Circulation 112:248.
  9. Ning, Q. et al. (2005) J. Immunol. 174:7403.
  10. Clark, D. A. et al. (2004) Mol. Hum. Reprod. 10:99.

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Gene Symbol Fgl2