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    • 1. 发明授权
    • Carcino-embryonic antigen derivatives lacking the carboxyl terminal end
    • 缺少羧基末端的癌胚抗原衍生物
    • US5672513A
    • 1997-09-30
    • US217299
    • 1994-03-23
    • Alexey TerskikhAndre PelegrinJean-Pierre Mach
    • Alexey TerskikhAndre PelegrinJean-Pierre Mach
    • A61K39/395C07K14/00C07K14/705C12N5/10C12N15/09C12N15/12C12P21/02C12P21/08C12R1/91G01N33/53G01N33/574C07K14/47C07K14/82
    • C07K14/705Y10S530/828
    • The present invention provides recombinant CEA glycoproteins and methods for their production. These recombinant CEA glycoproteins s lack the C-terminal 26 amino acids which are present in natural CEA and are characterized in that they are free from cross-reactive CEA-like antigens, antigenically indistingiushable from the soluble form of CEA shed from tumor cells, and devoid of the ethanolamine which is present at the C-terminus of natural CEA, and also devoid of the additional amino acids which may be attached to the natural CEA through said ethanolamine. Said recombinant CEA glycoproteins s preferably have the amino acid sequence SEQ ID NO: 1. The CEA glycoproteins s of the invention may be used as reagents in an immunoassay for the diagnosis of neoplastic diseases. The invention also relates to a DNA encoding said recombinant CEA glycoprotein, such as the DNA having the nucleotide sequence SEQ ID NO: 2 or a functional equivalent sequence thereof. The present invention also relates to recombinant vectors comprising said DNA, which recombinant vector is capable of directing the expression of said DNA in a compatible host cell, and to transformed host cells containing such a recombinant vector. The recombinant CEA glycoprotein of the present invention, preferably integrated in a test-kit, may be used for determining the presence of tumor cells in a sample of body fluid.
    • 本发明提供重组CEA糖蛋白及其生产方法。 这些重组CEA糖蛋白缺乏存在于天然CEA中的C-末端26个氨基酸,其特征在于它们不具有从可溶形式从肿瘤细胞中流出的CEA抗原性不可抵抗的交叉反应性CEA-样抗原,以及 没有存在于天然CEA的C末端的乙醇胺,也没有可以通过所述乙醇胺与天然CEA连接的另外的氨基酸。 所述重组CEA糖蛋白优选具有SEQ ID NO:1的氨基酸序列。本发明的CEA糖蛋白可用作用于诊断肿瘤疾病的免疫测定中的试剂。 本发明还涉及编码所述重组CEA糖蛋白的DNA,例如具有核苷酸序列SEQ ID NO:2的DNA或其功能等同序列。 本发明还涉及包含所述DNA的重组载体,所述重组载体能够引导所述DNA在相容宿主细胞中的表达,以及含有这种重组载体的转化宿主细胞。 优选整合在试验盒中的本发明的重组CEA糖蛋白可用于测定体液样品中肿瘤细胞的存在。