Fibrillin 1 (FBN1)

Fibrillin-1 is a major component of the microfibrils that form a sheath surrounding the amorphous elastin. It is believed that the microfibrils are composed of end-to-end polymers of fibrillin. To date, 3 forms of fibrillin have been described. The fibrillin-1 protein was isolated by Engvall in 1986, and mutations in the gene have been linked to the Marfan syndrome. At present more than 100 different mutations have been described. Trask et al. (1999) found that human FIB1 and FIB2 homodimerized via an N-terminal region and that the interaction was stabilized by disulphide bonds. Dimer formation occurred intracellularly, suggesting that the process of fibrillin aggregation initiates early after biosynthesis of the molecules.

Asprosin is generated from the gene FBN1 (amino acid residues 2732–2871), which also generates fibrillin.