FUNCTION Plays an adhesive role by integrating collagen bundles. It is probably associated with the surface of interstitial collagen fibrils via COL1. The COL2 domain may then serve as a rigid arm which sticks out from the fibril and protrudes the large N-terminal globular domain into the extracellular space, where it might interact with other matrix molecules or cell surface receptors (By similarity).SUBUNIT Homotrimer.SUBCELLULAR LOCATION Lysines at the third position of the tripeptide repeating unit (G-X-Y) are hydroxylated in all cases and bind carbohydrates.PTM Prolines at the third position of the tripeptide repeating unit (G-X-Y) are hydroxylated in some or all of the chains.PTM May contain numerous cysteine residues involved in inter- and intramolecular disulfide bonding.SIMILARITY Belongs to the fibril-associated collagens with interrupted helices (FACIT) family.