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: response to peptide hormone stimulus; response to gravity; platelet activation; ossification; 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 cadmium ion; platelet degranulation; response to ethanol; response to cytokine stimulus; response to lead ion; blood coagulation; response to calcium ion; inner ear development; lung development
SS: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.