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    • 8. 发明申请
    • MODULATING PH-SENSITIVE BINDING USING NON-NATURAL AMINO ACIDS
    • 使用非天然氨基酸调节敏感性结合
    • US20090035836A1
    • 2009-02-05
    • US12147379
    • 2008-06-26
    • Deepshikha DattaWilliam A. GoddardDavid TirrellJoyce Yaochun Peng
    • Deepshikha DattaWilliam A. GoddardDavid TirrellJoyce Yaochun Peng
    • C12N7/00C07K2/00C07K16/00
    • C07K16/32
    • The invention provides methods, systems and reagents for regulating pH-sensitive protein interaction by incorporating non-natural amino acids into the protein (e.g. an antibody, or its functional fragment, derivative, etc.). The invention also relates to specific uses in regulating pH-sensitive binding of antibodies to tumor site, by conferring enhanced tumor-specificity/selectivity. In that embodiment, the non-natural amino acids preferably have desirable side-chain pKa's, such that at below physiological pH (e.g. about pH 6.3-6.5) the non-natural amino acid confer enhanced binding to tumor antigens in acidic environments. Such non-natural amino acids can be incorporated by any suitable means, such as by utilizing a modified aminoacyl-tRNA synthetase to charge the nonstandard amino acid to a modified tRNA, which forms strict Watson-Crick base-pairing with a codon that normally forms wobble base-pairing with natural tRNAs (e.g. the degenerate codon orthogonal system.
    • 本发明提供了通过将非天然氨基酸掺入蛋白质(例如抗体或其功能片段,衍生物等)来调节pH敏感蛋白质相互作用的方法,系统和试剂。 本发明还涉及通过赋予增强的肿瘤特异性/选择性来调节抗体对肿瘤部位的pH敏感结合的具体用途。 在该实施方案中,非天然氨基酸优选具有所需的侧链pKa,使得在低于生理pH(例如约pH 6.3-6.5)下,非天然氨基酸在酸性环境中赋予增强的与肿瘤抗原的结合。 这样的非天然氨基酸可以通过任何合适的方式并入,例如通过利用修饰的氨酰-tRNA合成酶将非标准氨基酸装入修饰的tRNA,其与通常形成的密码子形成严格的沃森 - 克里克碱基配对 与天然tRNA的摆动碱基配对(如简并密码子正交系统)。