Ficolin M (Ficolin 1)

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The ficolins are a group of soluble animal proteins with roles in innate immunity (29-33)[1][2][3][4][5]. The classification of ficolins as lectins is somewhat controversial since the ligand binding domain in ficolins is specific for acetyl groups in both carbohydrates (e.g. GlcNAc, ManNAc, GalNAc) and non-carbohydrates (eg N-acetylglycine, N-acetylcysteine, acetylcholine) (30, 34)[2][6]. Binding of sugars is not primarily dependent on the sugar ring, and sugars that do not contain acetyl groups are generally not ficolin ligands (32)[4]. However, many of the bacterial surface molecules that appear to be natural ligands for the ficolins contain carbohydrate moieties, and ficolins have similar functional properties to lectins. They are certainly capable of binding acetylated sugars as evidenced by glycan array screening (35)[7]. Ficolin M (Ficolin 1) and Ficolin L (Ficolin 2) are the most widely studied (33-40)[5][6][7][8][9][10][11][12]. Ficolin L is a serum protein produced in the liver that through association with Mannose-binding protein-associated proteases (MASPs) triggers complement activation in response to binding to pathogen surfaces. It also serves as an opsinin triggering phagocytic uptake of pathogens by neutrophils. Polymorphisms in Ficolin L may have pathophysiological implications (41)[13]. Ficolin M is produced in the lung and has been examined structurally. Ficolin M is found in secretory granules in neutrophils and monocytes, recognizes pathogens, and also activates complement via MASPs (39)[11].

See also: paradigm page for Ficolins/Mannose-binding protein

Contents

CFG Participating Investigators contributing to the understanding of this paradigm

Investigators using CFG resources to study ficolins include: Raymond Dwek, Daniel Mitchell, Nicole Thielens

Progress toward understanding this GBP paradigm

Carbohydrate ligands


Cellular expression


Structure


Biological roles of GBP-ligand interaction


CFG resources used in investigations

The best examples of CFG contributions to this paradigm are described below, with links to specific data sets. For a complete list of CFG data and resources relating to this paradigm, see the CFG database search results for ficolin.

Glycan profiling


Glycogene microarray


Knockout mouse lines


Glycan array

The soluble ficolins have been extensively examined using the CFG glycan array (28 screens).

Related GBPs

This family is characterized by the presence of a leader peptide, a short N-terminal segment, followed by a collagen-like region, and a C-terminal fibrinogen-like domain. Homologs are apparently absent in D. melanogaster and C. elegans. Several human family members have been described but Ficolin L and M are the best characterized both biochemically and structurally. Ficolin L and H are made in the liver, while Ficolin M and H are produced by the lung. Two ficolins (A and B) are present in mouse. Ficolin B may be the ortholog of Ficolin M.

References

  1. Lu, J. and Le, Y. Ficolins and the fibrinogen-like domain. Immunobiology 199, 190-199 (1998)
  2. 2.0 2.1 Teh, C., Le, Y., Lee, S. H. and Lu, J. M-ficolin is expressed on monocytes and is a lectin binding to N-acetyl-D-glucosamine and mediates monocyte adhesion and phagocytosis of Escherichia coli. Immunology 101, 225-232 (2000)
  3. Matsushita, M. and Fujita, T. The role of ficolins in innate immunity. Immunobiology 205, 490-497 (2002)
  4. 4.0 4.1 Endo, Y., Liu, Y. and Fujita, T. Structure and function of ficolins. Adv Exp Med Biol 586, 265-279 (2006)
  5. 5.0 5.1 Zhang, X. L. and Ali, M. A. Ficolins: structure, function and associated diseases. Adv Exp Med Biol 632, 105-115 (2008)
  6. 6.0 6.1 Frederiksen, P. D., Thiel, S., Larsen, C. B. and Jensenius, J. C. M-ficolin, an innate immune defence molecule, binds patterns of acetyl groups and activates complement. Scand J Immunol 62, 462-473 (2005)
  7. 7.0 7.1 Gout, E., Garlatti, V., Smith, D. F., Lacroix, M. M., Dumestre-Perard, C., Lunardi, T., Martin, L., Cesbron, J. Y., Arlaud, G. J., Gaboriaud, C. and Thielens, N. M. Carbohydrate recognition properties of human ficolins: Glycan array screening reveals the sialic acid binding specificity of M-ficolin. J Biol Chem (2009)
  8. Liu, Y., Endo, Y., Iwaki, D., Nakata, M., Matsushita, M., Wada, I., Inoue, K., Munakata, M. and Fujita, T. Human M-ficolin is a secretory protein that activates the lectin complement pathway. J Immunol 175, 3150-3156 (2005)
  9. Tanio, M., Kondo, S., Sugio, S. and Kohno, T. Overexpression, purification and preliminary crystallographic analysis of human M-ficolin fibrinogen-like domain. Acta Crystallogr Sect F Struct Biol Cryst Commun 62, 652-655 (2006)
  10. Garlatti, V., Martin, L., Gout, E., Reiser, J. B., Fujita, T., Arlaud, G. J., Thielens, N. M. and Gaboriaud, C. Structural basis for innate immune sensing by M-ficolin and its control by a pH-dependent conformational switch. J Biol Chem 282, 35814-35820 (2007)
  11. 11.0 11.1 Frankenberger, M., Schwaeble, W. and Ziegler-Heitbrock, L. Expression of M-Ficolin in human monocytes and macrophages. Mol Immunol 45, 1424-1430 (2008)
  12. Honore, C., Rorvig, S., Munthe-Fog, L., Hummelshoj, T., Madsen, H. O., Borregaard, N. and Garred, P. The innate pattern recognition molecule Ficolin-1 is secreted by monocytes/macrophages and is circulating in human plasma. Mol Immunol 45, 2782-2789 (2008)
  13. Messias-Reason, I. J., Schafranski, M. D., Kremsner, P. G. and Kun, J. F. Ficolin 2 (FCN2) functional polymorphisms and the risk of rheumatic fever and rheumatic heart disease. Clin Exp Immunol 157, 395-399 (2009)

Acknowledgements

The CFG is grateful to the following PIs for their contributions to this wiki page: John Hanover

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