Abstract: HLA-G1, which is a newly defined non-classical HLA class I molecule, plays an important role in mediating immunotolerance and protecting embryo and even some kinds of tumors from NK cells attacking. The full-length coding sequences containing cDNA of HLA-G1 were cloned from placenta, monocytes and liver cancer tissue of Chinese donors. Sequence analysis reveals that it is a highly conserved human gene with only two amino acid mutation sites compared to foreign nationality. Its truncated form was overexpressed in E.Coli and the recombinant proteins were purified with affinity chromatography. We predict its possible three-dimensional structure and interaction with specific receptor KIR2DL4 by knowledge-based computer modeling.

Key words: HLA-G1, immunotolerance, cDNA cloning, sequence analysis, expression, three-dimensional structure, interaction

摘要： 从中国人外周血单个核细胞、胎盘组织和肝癌组织等样品中克隆了包含完整HLA-G1读框的cDNA；与国外同行获得的该基因及其蛋白质序列比较分析表明，该基因虽然有着细微的种族特异性，但高度保守；并获得了它的截断型重组蛋白，根据蛋白一级结构和同源比较方法，模建了它及其与特异性受体KIR2DL4形成复合体的空间结构模拟，预测了它们之间相互作用的特征。

关键词: HLA-G1, 免疫耐受, cDNA克隆, 序列分析, 表达, 空间结构, 相互作用