Fibronectin, type I (IPR000083)

Short name: Fibronectin_type1

Overlapping homologous superfamilies


Domain relationships



Fibronectin type I repeats are one of the three repeats found in the fibronectin protein. Fibronectin is a plasma protein that binds cell surfaces and various compounds including collagen, fibrin, heparin, DNA, and actin. Type I domain (FN1) is approximately 40 residues in length. Four conserved cysteines are involved in disulphide bonds. The 3D structure of the FN1 domain has been determined [PMID: 2112232, PMID: 1602484, PMID: 7582899]. It consists of two antiparallel beta-sheets, first a double-stranded one, that is linked by a disulphide bond to a triple-stranded beta-sheet. The second conserved disulphide bridge links the C-terminal adjacent strands of the domain.

In human tissue plasminogen activator chain A the FN1 domain together with the following epidermal growth factor (EGF)-like domain are involved in fibrin-binding [PMID: 1900516]. It has been suggested that these two modules form a single structural and functional unit [PMID: 7582899]. The two domains keep their specific tertiary structure, but interact intimately to bury a hydrophobic core; the inter-module linker makes up the third strand of the EGF-module's major beta-sheet.

GO terms

Biological Process

No terms assigned in this category.

Molecular Function

No terms assigned in this category.

Cellular Component

GO:0005576 extracellular region

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.
PROSITE profiles
PROSITE patterns