Milk Fat Globule-EGF Factor 8, Recombinant, Human (MFG-E8, MFGM, Sperm Surface Protein
SP47, MP47, Lactadherin)
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| Human MFG-E8 (milk fat globule-EGF factor 8; also lactadherin, breast epithelial antigen BA46, and medin) is a 46kD, secreted, monomeric glycoprotein that is associated with the human milk fat globule (HMFG) membrane (1-3). It is expressed by mammary epithelial cell surfaces, artery media, and in several carcinomas (1-4). Human MGF-E8 is synthesized as a 387 amino acid (aa) precursor that contains a 23 aa signal sequence and a 364 aa mature region (SwissProt # Q08431). The mature molecule contains four N-linked glycosylation sites, an amino-terminal EGF-like domain, plus C1 and C2 Ig-like domains which are related to discoidin I and homologous to those of human coagulation factors V and VIII (2, 3). Within the EGF-like domain is an Arg-Gly-Asp (RGD) sequence, which is strategically placed in a hairpin loop between two antiparallel beta strands (2, 3). In this way, the EGF-like domain serves as a scaffold for the RGD sequence, which is proposed to promote cell adhesion by binding cell-surface integrin receptors, such as avb3 (2, 3). Human MFG-E8 shares 59%, 58%, 56%, and 52% aa sequence identity with porcine, bovine, rat, and mouse MFG-E8, respectively. Functionally, MFG-E8 in milk is reported to block rotavirus infection (5). MFG-E8 expression by macrophages promotes the phagocytosis of apoptotic thymocytes by forming a bridge between phosphatidylserine on apoptotic cells, and avb3 integrin on phagocytes (4, 6). The MFG-E8 expression by macrophages controls the accumulation of apoptotic membrane fragments in atherosclerotic plaques and substantially limits lesion development (4). | | | Catalog # | M3896-90H | | Calculated molecular mass of ~ 41.6kD. As a result of glycosylation, the recombinant protein migrates as an ~ 45-50kD protein in SDS-PAGE under reducing conditions. | | Biological Activity | Measured by the ability of the immobilized protein to support the adhesion of SVEC4-10 mouse vascular endothelial cells. When 5x10e4 cells/well are added to rhMFG-E8 coated plates (10ug/ml, 100ul/well), ~45-75% adhered after 60 minutes at 37°C. | | Storage and Stability | Lyophilized powder may be stored at -20°C. Stable for 12 months at -20°C. Reconstitute by adding sterile PBS. Aliquot and store at -20°C. Stable for 6 months at -20°C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer. | | Molecular Weight | 41.6kD | | Source | Recombinant corresponding to aa24-387 of human Milk Fat Globule-EGF Factor 8 with a C-terminal 6-His tag expressed in NSO cells. | | Purity | 90%, as determined by SDS-PAGE under reducing conditions and visualized by silver stain. Endotoxin: <1EU/ug (LAL) | | Form | Supplied as a lyophilized powder from PBS. Reconstitute with sterile PBS to a concentration of 0.1mg/ml. | | | Important Note | This product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications without the expressed written authorization of United States Biological. |
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