Human SPARC Protein, Recombinant


产品货号:PR00667HuP1
   
询价

规格:100ug

产品名称Human SPARC Protein, Recombinant
 
纯度≥95 % as determined by SDS-PAGE
 
内毒素/
 
生物活性/
 
序列起止Ala18~Ile303
 
标签/
 
Uniprot链接P09486
 
表达系统E.coli
 
种属Human
 
预测 N 端Met
 
预测分子量/
 
缓冲液20mM Tris, 250mM imidazole, 500mM NaCl, pH8.0, containing 10% glycerol.
 
运输方式This Protein is shipped as lyophilized powder at ambient temperature. Upon receipt, store it immediately at the temperature recommended.
 
稳定性 & 储存条件Avoid repeated freeze/thaw cycles. Store at 2-8°C for one month. Aliquot and store at -80°C for 12 months.
 
复溶Please refer to COA for detailed information
 
别称BM-40/ON
 
背景信息SPARC. SPARC, an acronym for “secreted protein, acidic and rich in cysteine”, is also known as osteonectin or BM-40 (1 - 5). It is the founding member of a family of secreted matricellular proteins with similar domain structure. The 302 amino acid (aa), 43 kDa protein contains a 17 aa signal sequence, an N-terminal acidic region that binds calcium, a follistatin domain containing Kazal-like sequences, and a C-terminal extracellular calcium (EC) binding domain with two EF-hand motifs (1 - 5). Crystal structure shows that residues implicated in cell binding, inhibition of cell spreading and disassembly of focal adhesions cluster on one face of SPARC, while a collagen binding epitope and an N-glycosylation site are opposite this face (6). SPARC is produced by fibroblasts, capillary endothelial cells, platelets and macrophages, especially in areas of tissue morphogenesis and remodeling (3, 7). SPARC shows context-specific effects, but generally inhibits adhesion, spreading and proliferation, and promotes collagen matrix formation (3 - 5). For endothelial cells, SPARC disrupts focal adhesions and binds and sequesters PDGF and VEGF (3 - 5). SPARC is abundantly expressed in bone, where it promotes osteoblast differentiation and inhibits adipogenesis (5, 8). SPARC is potentially cleaved by metalloproteinases, producing an angiogenic peptide that includes the copper-binding sequence KGHK (7). Paradoxically, SPARC is highly expressed in many tumor types, yet expression mainly decreases the likelihood of metastasis and confers sensitivity to chemotherapy and radiation (4, 9, 10). Stabilin-1, which is expressed on alternately activated macrophages, is the first SPARC receptor to be identified. It binds the SPARC EC domain and mediates endocytosis for degradation (11). Mature mouse SPARC shows 97%, 92%, 92%, 92% and 83% aa identity with rat, human, dog, cow and chick SPARC, respectively.
 
全称SPARC (SPARC)
 
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