Appears to regulate cell growth through interactions with the extracellular matrix and cytokines. Binds calcium and copper, several types of collagen, albumin, thrombospondin, PDGF and cell membranes. There are two calcium binding sites; an acidic domain that binds 5 to 8 Ca(2+) with a low affinity and an EF-hand loop that binds a Ca(2+) ion with a high affinity. Belongs to the SPARC family. Note: This description may include information from UniProtKB.
Molecular Function: collagen binding; protein binding; extracellular matrix binding; calcium ion binding
Biological Process: platelet activation; response to gravity; response to peptide hormone stimulus; ossification; extracellular matrix organization and biogenesis; response to cAMP; heart development; response to glucocorticoid stimulus; response to lipopolysaccharide; signal transduction; response to L-ascorbic acid; regulation of cell proliferation; response to ethanol; response to cadmium ion; platelet degranulation; response to cytokine stimulus; response to lead ion; blood coagulation; response to calcium ion; inner ear development; lung development