Osteopontin (SPP1) Recombinant Protein

The protein encoded by this gene is involved in the attachment of osteoclasts to the mineralized bone matrix. The encoded protein is secreted and binds hydroxyapatite with high affinity. The osteoclast vitronectin receptor is found in the cell membrane and may be involved in the binding to this protein. This protein is also a cytokine that upregulates expression of interferon-gamma and interleukin-12. Several transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Oct 2011]

osteopontin: Binds tightly to hydroxyapatite. Appears to form an integral part of the mineralized matrix. Probably important to cell-matrix interaction. Belongs to the osteopontin family. 5 isoforms of the human protein are produced by alternative splicing.

Protein type: Secreted, signal peptide; Secreted

Chromosomal Location of Human Ortholog: 4q22.1

Cellular Component: extracellular space; cell projection; perinuclear region of cytoplasm; apical part of cell; extracellular region

Molecular Function: protein binding; extracellular matrix binding; cytokine activity

Biological Process: neutrophil chemotaxis; extracellular matrix organization and biogenesis; decidualization; osteoblast differentiation; extracellular matrix disassembly; response to vitamin D; biomineral formation; response to steroid hormone stimulus; negative regulation of collateral sprouting of intact axon in response to injury; positive regulation of bone resorption; cell adhesion; inflammatory response; embryo implantation