<0.10 EU per 1 μg of the protein by the LAL method.
Measured by its binding ability in a functional ELISA. When Recombinant Human LILRA4/CD85g/ILT7 is coated at 1 μg/mL, Recombinant Human Angiopoietin-like Protein 7/ANGPTL7 (Catalog # 914-AN) binds with a typical ED50 of 20-120 ng/mL.
Mouse myeloma cell line, NS0-derived human LILRA4/CD85g/ILT7 protein Glu24-Asn446, with a C-terminal 6-His tag
When Recombinant Human LILRA4/CD85g/ILT7 is coated at 1μg/mL, Recombinant Human Angiopoietin-like Protein 7/ANGPTL7 (Catalog # 914-AN) binds with an ED50 of 20-120 ng/mL.
LILRA4, also known as ILT7 and CD85g, is an approximately 60-70 kDa variably glycosylated transmembrane protein that regulates immune cell activation (1). Mature human LILRA4 consists of a 423 amino acid (aa) extracellular domain (ECD) with four immunoglobulin-like domains, a 21 aa transmembrane segment, and a 32 aa cytoplasmic domain (2). Alternative splicing generates an additional isoform that lacks the signal peptide and a portion of the first Ig-like domain. LILRA4 is expressed on plasmacytoid dendritic cells (pDC) but is down-regulated in response to TLR9 signaling (3-5). Antibody mediated crosslinking of LILRA4 on pDC inhibits the production of type I interferons following TLR7 or TLR9 stimulation (3, 4, 6). It also blocks the up-regulation of CCR7 but enhances the up-regulation of Integrin beta 7 on TLR7/9-stimulated pDC (6). LILRA4 associates with the ITAM-containing adaptor protein Fc epsilon RI gamma (3, 4, 6), and this complex binds to cell surface BST2/Tetherin which is expressed on monocytes, plasmacytoid and myeloid dendritic cells, B cells, and activated CD4+ and CD8+ T cells (5, 8). This interaction inhibits the TLR-induced pDC production of type I interferons, IL-6, and TNF-alpha (8).
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Tavano, B. and A. Boasso (2014) PLoS ONE 9:e89414.
Cao, W. et al. (2009) J. Exp. Med. 206:1603.
Leukocyte Immunoglobulin-like Receptor, Subfamily A (with TM domain), Member 4
Entrez Gene IDs:
CD85 antigen-like family member G; CD85g antigen; CD85g; ILT7; ILT-7; ILT7MGC129598; Immunoglobulin-like transcript 7; leukocyte immunoglobulin-like receptor subfamily A member 4; leukocyte immunoglobulin-like receptor, subfamily A (with TM domain), member 4; leukocyte immunoglobulin-like receptor, subfamily A (without TM domain), member4; LILRA4; MGC129597
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