Translation systems and other compositions including orthogonal aminoacyl tRNA-synthetases that preferentially charge an orthogonal tRNA with an iodinated or brominated amino acid are provided. Nucleic acids encoding such synthetases are also described, as are methods and kits for producing proteins including heavy atom-containing amino acids, e.g., brominated or iodinated amino acids. Methods of determining the structure of a protein, e.g., a protein into which a heavy atom has been site-specifically incorporated through use of an orthogonal tRNA/aminoacyl tRNA-synthetase pair, are also described.
提供了包括正交
氨基酰 tRNA 合成酶的翻译系统和其他组合物,该合成酶可优先将
碘化或
溴化
氨基酸充入正交 tRNA。 还描述了编码这种合成酶的核酸,以及生产包括含重
金属原子的
氨基酸(如
溴化或
碘化
氨基酸)的蛋白质的方法和试剂盒。 还描述了确定蛋白质结构的方法,例如,通过使用正交 tRNA/
氨基酰 tRNA-合成酶对特异性加入重原子的蛋白质。