背景介绍(Background)：

The protein functions in part as an adhesive glycoprotein. Differential expression of this protein can promote either cell adhesion or migration as it links cells to the extracellular matrix through a variety of ligands. These ligands include integrins, plasminogen activator inhibitor-1, and urokinase plasminogen activator receptor. This secreted protein can be present in the plasma as a monomer or dimer and forms a multimer in the extracellular matrix of several tissues. This protein also inhibits the membrane-damaging effect of the terminal cytolytic complement pathway and binds to several serpin serine protease inhibitors. This protein can also promote extracellular matrix degradation and thus plays a role in tumorigenesis. It is involved in a variety of other biological processes such as the regulation of the coagulation pathway, wound healing, and tissue remodeling. The heparin-binding domain of this protein give it anti-microbial properties. It is also a lipid binding protein that forms a principal component of high density lipoprotein. [provided by RefSeq, Aug 2020].

Vitronectin (VN) is an abundant adhesive glycoprotein in blood plasma and is found associated with different extracellular matrix sites, the vessel wall, and tumor cells, particularly upon tissue remodeling, injury/repair, or under disease conditions. Plasma VN is a structurally labile molecule that may be converted into a multimeric/multivalent form by interaction with various (hemostatic) factors or through surface binding. Mature VN is composed of several functionally unique binding domains for different interaction partners along the protein sequence that are mainly concentrated within the amino- and carboxy-terminal parts of the protein. Starting at the amino-terminus, these are the ‘‘somatomedin-B’’ (SMB) domain, the Arg-Gly-Asp (RGD) adhesion motif followed by an adjacent acidic epitope (due to sulfation and phosphorylation sites) that is part of the binding site for high molecular weight kininogen (HK), a long connecting segment encompassing a collagen binding domain, followed by two substructured hemopexin-like domains within the carboxy-terminal portion of the protein. These distinct binding domains endow VN acts as a potent matricellular factor, coordinating cell migration with pericellular proteolysis and growth factor signaling at sites of tissue remodeling or in tumors. The glycosylated form of human VN (459 amino acid residues) has a molecular mass of 75 to 78 kDa and circulates as single-chain (65 kDa) and/or disulfide-bridged twochain (10 to 12 kDa) forms, the latter being genetically determined by the amino acid residue at position 381 and derived from proteolytic cleavage in the carboxy-terminal region. A Met381Thr polymorphism increases the risk by 18-fold of hemangioblastoma in patients with von-Hippel-Lindau gene defect, possibly related to enhanced tumor angiogenesis.

图2 Vitronectin蛋白发挥功能示意图

制剂(Formulation)：

Lyophilized from 0.22 μm filtered solution in PBS，5%mannital，0.01% Tween80 pH7.4. 

质量控制(Quality Control)：

Purity: ≥ 95% as determined by reducing SDS-PAGE.    

Endotoxin: ＜ 0.1 EU/ug as determined by LAL test.

保存(Storage)：

Use a manual defrost freezer and avoid repeated freeze - thaw cycles.
12 months from date of receipt, -20 to -70℃ as supplied.
1 month, 2 to 8℃ under sterile conditions after reconstitution.
6 months, -20 to -70℃ under sterile conditions after reconstitution.  

FOR RESEARCH USE ONLY

参考文献：

[1] Oishi Y, et al. 2021. Neurosci Lett. 746:135648.

[2] Preissner KT, et al. 2011. Semin Thromb Hemost. 37(4):408-424.

[3] Leavesley DI, et al. 2013. IUBMB Life. 65(10):807-818.