Human Osteoadherin/OSAD Antibody
Human Osteoadherin/OSAD Antibody Summary
Accession # Q99983.1
Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.
Preparation and Storage
- 12 months from date of receipt, -20 to -70 °C as supplied.
- 1 month, 2 to 8 °C under sterile conditions after reconstitution.
- 6 months, -20 to -70 °C under sterile conditions after reconstitution.
Osteoadherin (OSAD), also known as Osteomodulin, is an extracellular matrix keratan sulfate proteoglycan that belongs to the class II subfamily of small leucine-rich proteoglycans (SLRP). LRR motifs consist of approximately 20‑30 amino acids (aa) with conserved leucine spacing, folded into a structure with one beta -sheet and one alpha -helix (1, 2). The human OSAD cDNA encodes a 421 aa precursor that contains a 20 aa signal sequence and eleven tandem leucine rich repeats (3). Human OSAD shares 80‑84% aa sequence identity with bovine, mouse, and rat OSAD. Human OSAD shares 32‑35% aa sequence identity with human class II SLRPs Fibromodulin, Keratocan, Lumican, and PRELP. Bovine, mouse, and rat OSAD are expressed as 60‑85 kDa molecules, although the amino acid sequence for each predicts a size of 46‑47 kDa. The primary difference is due to the presence of extensive N-linked glycosylation that can also vary between tissues of the same species (4, 5). Human OSAD is expressed as an even larger 110 kDa molecule in teeth (6). OSAD contains eight sulfated tyrosine residues (4, 7) and is distinguished from other class II SLRPs by the presence of an approximately 70 aa C-terminal acidic domain (3). OSAD is expressed by fetal and adult osteoblasts but is not detectable in cartilage or tendon (3, 4, 8). In dental tissue, OSAD is expressed by odontoblasts and ameloblasts (5, 9‑11) and is involved in the mineralization of bone and teeth (5, 11, 12). OSAD promotes the adhesion of osteoblasts and odontoblasts to the surrounding matrix, an interaction that is mediated by Integrin alpha V beta 3 (4, 6).
- Matsushima, N. et al. (2000) Proteins 38:210.
- Kobe, B. and A.V. Kajava (2001) Curr. Opin. Struct. Biol. 11:725.
- Sommarin, Y. et al. (1998) J. Biol. Chem. 273:16723.
- Wendel, M. et al. (1998) J. Cell Biol. 141:839.
- Hultenby, P.U. et al. (2003) Eur. J. Oral Sci. 111:128.
- Lucchini, M. et al. (2004) J. Dent. Res. 83:552.
- Onnerfjord, P. et al. (2004) J. Biol. Chem. 279:26
- Shen, Z. et al. (1999) Matrix Biol. 18:533.
- Buchaille, R. et al. (2000) Bone 27:265.
- Buchaille, R. et al. (2000) Matrix Biol. 19:421.
- Couble, M.L. et al. (2004) Histochem. Cell Biol. 121:47.
- Ramstad, V.E. et al. (2003) Calcif. Tissue Int. 72:57.
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