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    • 2. 发明公开
    • New FK-506 cytosolic binding protein
    • 蛋白质蛋白酶Cytosol,das FK-506 binden kann。
    • EP0379342A2
    • 1990-07-25
    • EP90300459.6
    • 1990-01-17
    • Merck & Co., Inc.
    • Siekierka, John J.Staruch, Marie J.Sigal, Nolan H.Mumford, Richard A.Hung, Hsueh-Yun
    • C07K15/12G01N33/68
    • C12N9/90C12N15/90
    • A new homogeneous cytosolic binding (HCB) protein, having a specific binding activity of about 26 µg FK-506 per mg protein and a molecular weight of about 10-12 kilodaltons, reversibly binds the immunosuppressant FK-506 but not cyclosporine A (CSA). The protein is stable to heating at 56 degrees C. for 30 minutes retaining its FK-506 binding affinity, and has the (partial) amino terminal amino acid sequence: H₂N-Gly-Val-Gln-Val-­Glu-Thr-Ile-Ser-Pro-Gly-Asp-Gly-Arg-Thr-Phe-Pro-Lys-­Arg-Gly-Gln-Thr-X-Val-Val-His-Tyr-Thr-Gly-Met-Leu-­Glu-Asp-Gly-Lys-Lys-Phe-Asp (wherein X is undefined). The HCB protein is isolated from the cytosol of mammalian tissues, preferably human neoplastic T-cell lines, e.g. Jurkat, and can be used in diagnostic and purification procedures involving FK-506 macrolide type immunosuppressants. The HCB protein also catalyses the cis-trans isomerization of proline-containing peptide bonds.
    • 具有约26μgFK-506 / mg蛋白质和约10-12千道尔顿分子量的特异性结合活性的新的均匀胞质结合(HCB)蛋白可逆地结合免疫抑制剂FK-506而不是环孢霉素A(CSA )。 蛋白质在56℃下加热稳定30分钟,保持其FK-506结合亲和力,并具有(部分)氨基末端氨基酸序列:H2N-Gly-Val-Gln-Val-Glu-Thr-Ile- Ser-Pro-Gly-Asp-Gly-Arg-Thr-Phe-Pro-Ly-Arg-Gly-Gln-Thr-X-Val-Val-His-Tyr-Thr-Gly-Met-Leu-Glu-Asp -Gly-Lys-Lys-Phe-Asp(其中X未定义)。 HCB蛋白从哺乳动物组织的细胞溶质中分离,优选人肿瘤T细胞系,例如, Jurkat,可用于涉及FK-506大环内酯型免疫抑制剂的诊断和纯化程序。 HCB蛋白还催化含脯氨酸肽键的顺式 - 反式异构化。