Component of an integrin containing attachment complex, which is required for muscle development and maintenance (PubMed:22253611). Probable regulator of cell-extracellular matrix adhesion (PubMed:10893272). Required during initial muscle assembly to form dense bodies and M-lines (PubMed:10893272). Interacts with pat-4/ILK (PubMed:12015115, PubMed:12781130). Probably forms a complex with pat-4 and pat-6 (PubMed:12781130). Component of an integrin containing attachment complex, composed of at least pat-2, pat-3, pat-4, pat-6, unc-52, unc-97 and unc-112 (PubMed:22253611). Colocalizes with pat-3/beta-integrin in body wall muscles. Requires unc-52/perlecan and pat-3 to be localized to the muscle cell membrane (PubMed:10893272). Colocalizes with cpna-1 in M line and dense bodies (PubMed:23283987). Mainly expressed in muscle cells in both embryos and adults. The FERM domain is not correctly detected by PROSITE or Pfam techniques because it contains the insertion of a PH domain. RNAi-mediated knockdown results in impaired mobility, mitochondrial fragmentation and disrupted integrin attachment complexes in muscle. This leads to degradation of muscle proteins in the cytosol, myofibrillar defects and disruption of sarcomere organization. Belongs to the kindlin family.