Fibronectin (FN) is a multifunctional glycoprotein, the gene of which is localized to human chromosome 2q34-36. This gene spans 75kb and contains 50 exons. It exists as two major isoforms, one soluble and one insoluble form. The former is present in plasma, whereas the insoluble form resides in tissues and extracellular matrix (ECM) of cartilage. There are around 20 different forms of FN due to alternative splicing of a variable region and two type III exons called Extra Domains A and B.
Fibronectin is a glycoprotein with multiple domains. It comprises a N-terminal, central binding domain and a heparin-binding domain. Bovine plasma fibronectin has polypeptide chains with disulfide linkage and corresponds to a molecular weight of 220 and 215 kDa.
Fibronectin is a regulator of protein scaffolding. It coordinates cellular processes like platelet functions, wound-healing, adhesion, migration and aggregation.