FGL1

FGL1

FGL1

Protein-coding gene in the species Homo sapiens


Fibrinogen-like protein 1 (FGL-1) is a protein that is structurally related to fibrinogen. In humans, FGL-1 is encoded by the FGL1 gene.[5][6] Four splice variants exist for this gene.

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Function

Fibrinogen-like protein 1 is a member of the fibrinogen family of proteins, which also includes fibrinogen, fibrinogen-like protein 2, and clotting factors V, VIII, and XIII. FGL-1 is homologous to the carboxy terminus of the fibrinogen beta- and gamma- subunits which contains the four conserved cysteines of that are common to all members of the fibrinogen family. However, FGL-1 lacks the platelet-binding site, cross-linking region, and thrombin-sensitive site which allow the other members of the fibrinogen family to aid in fibrin clot formation.[6]

FGL-1 has also been observed to strongly bind to and activate LAG-3, a regulatory protein expressed on T cells. As LAG-3 has an important role in controlling activated T cells, manipulating FGL-1 binding to T cells has been proposed for both cancer immunotherapy and anti-inflammatory treatments.[7]

Clinical significance

FGL-1 may play a role in the development of hepatocellular carcinomas.[6]


References

  1. "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  2. "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  3. Yamamoto T, Gotoh M, Sasaki H, Terada M, Kitajima M, Hirohashi S (Jul 1993). "Molecular cloning and initial characterization of a novel fibrinogen-related gene, HFREP-1". Biochem Biophys Res Commun. 193 (2): 681–7. doi:10.1006/bbrc.1993.1678. PMID 8390249.
  4. Wang J, Sanmamed MF, Datar I, Su TT, Ji L, Sun J, et al. (January 2019). "Fibrinogen-like Protein 1 Is a Major Immune Inhibitory Ligand of LAG-3". Cell. 176 (1–2): 334–347.e12. doi:10.1016/j.cell.2018.11.010. PMC 6365968. PMID 30580966.

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