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Human LILRB1/CD85j/ILT2 Domain1&2 Protein

Product Info

Recombinant Human LILRB1/CD85j/IL-T2 Domain1&2 Protein is expressed from Expi293 with His tag at the C-terminal. It contains Gly24-Gly221.[Accession | Q8NHL6]

Molecular Weight

The protein has a predicted MW of 23.1 kDa. Due to glycosylation, the protein migrates to 25-30 kDa based on Tris-Bis PAGE result.


Less than 1EU per μg by the LAL method.


> 95% as determined by Tris-Bis PAGE
> 95% as determined by HPLC


Lyophilized from 0.22μm filtered solution in PBS (pH 7.4). Normally 5 % trehalose is added as protectant before lyophilization.


Centrifuge tubes before opening. Reconstituting to a concentration more than 100 μg/ml is recommended. Dissolve the lyophilized protein in distilled water.


The product should be stored at -70℃ or -20℃.

Assay Data
Tris-Bis PAGE

Human LILRB1 Domain1&2 on Tris-Bis PAGE under reduced conditions. The purity is greater than 95%.


The purity of Human LILRB1 Domain1&2 is greater than 95% as determined by SEC-HPLC.


Immobilized Human LILRB1 Domain1&2 at 1μg/ml (100μl/Well) on the plate. Dose response curve for Anti-LILRB1 Antibody,hFc Tag with the EC50 of 18.4ng/ml determined by ELISA.

Blocking Data

Serial dilutions of Human LILRB1 Antibody were added into Biotinylated Human HLA-G Complex Tetramer, His Tag : Human LILRB1 Domain1&2, His Tag binding reactioins. The half maximal inhibitiory concentration(IC50) is 34.6ng/ml.

SPR Data

Human HLA-G Tetramer captured on CM5 Chip can bind Human LILRB1 Domain1&2, His Tag with an affinity constant of 1.9μM as determined in SPR assay (Biacore T200).


LILRB1, also known as CD85j and IL-T2, is a 110 kDa transmembrane glycoprotein in the LILR immunoregulatory protein family. Mature human LILRB1 consists of a 438 amino acid (aa) extracellular domain (ECD) with 4 tandem Ig-like domains, a 21 aa transmembrane segment, and a 168 aa cytoplasmic domain with 4 inhibitory ITIM motifs.LILRB1 is a receptor for class I MHC antigens. Recognizes a broad spectrum of HLA-A, HLA-B, HLA-C, HLA-G and HLA-F alleles. Receptor for H301/UL18, a human cytomegalovirus class I MHC homolog. Ligand binding results in inhibitory signals and down-regulation of the immune response.


CD85 antigen-like family member J; CD85j antigen; CD85j; Ig-like transcript 2; ILT2; ILT-2; ILT2FLJ37515; Immunoglobulin-like transcript 2; leukocyte Ig-like receptor-1; Leukocyte immunoglobulin-like receptor 1; leukocyte immunoglobulin-like receptor subfamily B member 1 soluble isoform; leukocyte immunoglobulin-like receptor subfamily B member 1; leukocyte immunoglobulin-like receptor, subfamily B (with TM and ITIM domains); LILRB1; LIR1; LIR1LIR-1MIR-7CD85MIR7CD85 antigen; member 1; MIR7; Monocyte/macrophage immunoglobulin-like receptor 7


(1)Apps R , Gardner L , Sharkey A , et al. A homodimeric complex of HLA-G on normal trophoblast cells modulates antigen-presenting cells via LILRB1 [J]. European Journal of Immunology, 2007, 37(7):1924-1937.

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