Recombinant Human LILRB4/CD85k/ILT3 Protein, CF

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Recombinant Human LILRB4/CD85k/ILT3 Protein Binding Activity
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Recombinant Human LILRB4/CD85k/ILT3 Protein, CF Summary

Product Specifications

>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Endotoxin Level
<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 LILRB4/CD85k/ILT3 is coated at 2 μg/mL, Recombinant Human Angiopoietin-like Protein 7/ANGPTL7 (Catalog # 914-AN) binds with an apparent Kd <1 nM.
Mouse myeloma cell line, NS0-derived human LILRB4/CD85k/ILT3 protein
Pro17-His257, with a C-terminal 6-His tag
Accession #
N-terminal Sequence
Pro17& Ala (N+3 of signal derived sequence)
Predicted Molecular Mass
27 kDa
29-43 kDa, reducing conditions

Product Datasheets

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Carrier Free

What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.


Formulation Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitution Reconstitute at 100 μg/mL in PBS.
Shipping The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.

Scientific Data

Binding Activity Recombinant Human LILRB4/CD85k/ILT3 Protein Binding Activity View Larger

When Recombinant Human LILRB4/CD85k/ILT3 is coated at 2 µg/mL, Recombinant Human Angiopoietin-like Protein 7/ANGPTL7 (Catalog # 914-AN) binds with an apparent Kd<1 nM.

Reconstitution Calculator

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.


Background: LILRB4/CD85k/ILT3

ILT3, also known as CD85k and LIR-5, is an approximately 60 kDa transmembrane glycoprotein that negatively regulates immune cell activation (1). Mature human ILT3 consists of a 238 amino acid (aa) extracellular domain with two Ig-like domains, a 21 aa transmembrane segment, and a 168 aa cytoplasmic domain with 3 immunoreceptor tyrosine-based inhibitory motifs (ITIM) (2). Alternative splicing of human ILT3 generates an isoform that lacks the first ITIM and a secreted isoform that circulates in the serum of cancer patients (3, 4). ILT3 is expressed on dendritic cells (DC), monocytes, macrophages, and vascular endothelial cells (EC) (2, 5, 6). Ligation of ILT3 triggers ITIM-mediated inhibition of cell-activating signaling, leading to enhanced immune tolerance and reduced allogeneic graft rejection (2, 4, 7, 8). Soluble ILT3 induces the differentiation of CD8+ T suppressor cells (Ts) that can inhibit the effector functions of CD4+ Th cells and CD8+ CTL (4, 7, 9). In turn, CD8+ Ts cells induce ILT3 up-regulation and a tolerogenic phenotype in monocytes, DC, and EC (5, 6, 8, 10, 11).

  1. Vlad, G. et al. (2010) Int. Rev. Immunol. 29:119.
  2. Cella, M. et al. (1997) J. Exp. Med. 185:1743.
  3. Heinzmann, A. et al. (2000) Eur. J. Immunogenet. 27:121.
  4. Suciu-Foca, N. et al. (2007) J. Immunol. 178:7432.
  5. Gleissner, C.A. et al. (2007) Eur. J. Immunol. 37:177.
  6. Manavalan, J.S. et al. (2004) Int. Immunol. 16:1055.
  7. Vlad, G. and N. Suciu-Foca (2012) Exp. Mol. Pathol. 93:294.
  8. Chang, C.C. et al. (2002) Nat. Immunol. 3:237.
  9. Vlad, G. et al. (2006) Int. Immunopharmacol. 6:1889.
  10. Manavalan, J.S. et al. (2003) Transpl. Immunol. 11:245.
  11. Brenk, M. et al. (2009) J. Immunol. 183:145.
Long Name
Leukocyte Immunoglobulin-like Receptor, Subfamily B (with TM and ITIM Domains), Member 4
Entrez Gene IDs
11006 (Human); 14728 (Mouse)
Alternate Names
CD85 antigen-like family member K; CD85k antigen; CD85k; HM18; ILT3; ILT-3; ILT3CD85K; leukocyte immunoglobulin-like receptor, subfamily B (with TM and ITIM domains); LILRB4; LIR5; LIR5LILRB5; LIR-5subfamily B, member 4; member 4


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