Recombinant Human LILRB3/CD85a/ILT5 Fc Chimera Protein, CF

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Recombinant Human LILRB3/CD85a/ILT5 Fc Chimera Protein Bioactivity
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Recombinant Human LILRB3/CD85a/ILT5 Fc Chimera Protein, CF Summary

Product Specifications

>95%, by SDS-PAGE under reducing conditions and visualized by silver stain.
Endotoxin Level
<0.10 EU per 1 μg of the protein by the LAL method.
Measured by its ability to bind fluorescein-conjugated S. aureus Bioparticles. Jiang, Y. et al. (2006) J. Biol. Chem. 281:11834. The ED50 for this effect is 0.4-2 µg/mL.
Mouse myeloma cell line, NS0-derived human LILRB3/CD85a/ILT5 protein
Human ILRB3/CD85a/ILT5
Accession # AAB68668
N-terminus C-terminus
Accession #
N-terminal Sequence
Structure / Form
Disulfide linked homodimer
Predicted Molecular Mass
72.6 kDa (monomer)
95-105 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 250 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

Bioactivity Recombinant Human LILRB3/CD85a/ILT5 Fc Chimera Protein Bioactivity View Larger

Recombinant Human LILRB3/CD85a/ILT5 Fc Chimera (Catalog # 1806-T5) binds fluorescein-conjugated S. aureus Bioparticles. The ED50 for this effect is 0.4-2 µg/mL.

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Background: LILRB3/CD85a/ILT5

Leukocyte immunoglobulin-like receptor subfamily B (LILRB3), also known as ILT5, LIR3, and CD85a, is an immunoglobulin superfamily member that is involved in immune regulation. Subfamily B members have cytoplasmic immunoreceptor tyrosine-based inhibitory motifs (ITIMs) that inhibit signaling events via phosphatase SHP-1. Subfamily A members are activating receptors that lack ITIMs and signal through association with FcR gamma (1, 2). Mature LILRB3 is a highly polymorphic
85-95 kDa glycoprotein that consists of a 420 amino acid (aa) extracellular domain (ECD) with four Ig-like domains, a 21 aa transmembrane segment, and a 167 aa cytoplasmic domain with three ITIMs (3). Alternative splicing generates an isoform with a 17 aa insertion in the juxtamembrane ECD. In mouse and rat, the LILRB3 gene encodes the PIR-B protein which has six Ig-like domains. Rodent PIR-B and human LILRB3 share 55% aa sequence identity within common regions of their ECDs. LILRB3 is expressed on the surface of peripheral monocytes, neutrophils, eosinophils, basophils, and mast cell progenitors (4-6). Triggering of LILRB3 inhibits the activation of macrophages, mast cells, neutrophils, basophils, and B cells (5, 7). On osteoclast precursors, LILRB3 ligation inhibits RANK L/TRANCE or M-CSF induced differentiation (8). LILRB3 can also bind to ligands exposed on necrotic tumor cells (9). Both PIR-B and LILRB3 are receptors for S. aureus, and activation of these receptors by bacteria influences the innate immune response triggered by TLRs (3). R&D Systems in-house testing indicates that LILRB3 binds to
Angiopoietin-like 7, consistent with the demonstrated functional interactions between other members of these protein families (10). In the mouse CNS, PIR-B functions as a receptor for the myelin proteins Nogo, MAG, and OMgp and mediates their inhibitory action on neurite outgrowth and axon regeneration (11). Upon binding to MAG, PIR-B associates with TrkB and NGF R/p75 in cerebellar granule neurons (12).

  1. Thomas, R. et al. (2010) Clin. Rev. Allergy Immunol. 38:159.
  2. Anderson, K.J. and R.L. Allen (2009) Immunology 127:8.
  3. Nakayama, M. et al. (2007) J. Immunol. 178:4250.
  4. Tedla, N. et al. (2003) Proc. Natl. Acad. Sci. USA 100:1174.
  5. Sloane, D.E. et al. (2004) Blood 104:2832.
  6. Tedla, N. et al. (2008) J. Leukoc. Biol. 83:334.
  7. Uehara, T. et al. (2001) J. Clin. Invest. 108:1041.
  8. Mori, Y. et al. (2008) J. Immunol. 181:4742.
  9. Jones, D.C. et al. (2016) Oncotarget PMID 26769854.
  10. Zheng, J. et al. (2012) Nature 485:656.
  11. Atwal, J.K. et al. (2008) Science 322:967.
  12. Fujita, Y. et al. (2011) Cell Death Dis. 2:e198.
Entrez Gene IDs
11025 (Human)
Alternate Names
CD85 antigen-like family member A; CD85a antigen; CD85a; HL9Immunoglobulin-like transcript 5; ILT5; ILT-5; ILT5CD85a; Leukocyte immunoglobulin-like receptor 3; leukocyte immunoglobulin-like receptor subfamily B member 3; leukocyte immunoglobulin-like receptor, subfamily B (with TM and ITIM domains); LILRB3; LIR3; LIR3CD85A; LIR-3MGC138403; member 3; Monocyte inhibitory receptor HL9; PIRB


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