Incorporated into fibronectin-containing matrix fibers. May play a role in cell adhesion and migration along protein fibers within the extracellular matrix (ECM). Could be important for certain developmental processes and contribute to the supramolecular organization of ECM architecture, in particular to those of basement membranes.
Homomultimerizes and interacts with various extracellular matrix components such as FN1, LAMA1, LMA2, NID, ACAN, CSPG2 and type IV collagen. Interacts also with papillomavirus E6 proteins. Binding analysis demonstrated for isoform C a 100-fold stronger binding to the basement membrane protein NID than for isoform D. Interacts with FBLN7.