Recombinant human HLA-G protein

HLA-G, also known as HLA class I histocompatibility antigen, alpha chain G, belongs to the HLA class I heavy chain paralogues. This class I molecule is a heterodimer consisting of a heavy chain and a light chain (beta-2 microglobulin) . The heavy chain is anchored in the membrane. HLA-G is expressed on fetal derived placental cells. HLA-G is a non-classical class-I HLA molecule associated with anti-inflammatory and immuno-modulatory properties which interacts with inhibitory receptors (ILT2/ILT4/KIR2DL4) present on various immune cells. It inhibits proliferation of B cells, T cells and natural killer cells; and also induces regulatory T cells. Recombinant human HLA-G, fused to His-tag at N-terminus, was expressed in E. coli and purified by using conventional chromatography techniques.