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. May serve to anchor the mature/soluble form of DTR to its fibers as it migrates through the extracellular matrix. The direct physical association with DTR may be useful in such tissue developmental processes as wound healing. Homomultimerizes and interacts with various extracellular matrix components. Interacts with FBLN7 (By similarity). Interacts with the mature/soluble form of DTR. Interacts with CCN3 (By similarity). Belongs to the fibulin family.