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Tetrahydrofuranyl and Tetrahydropyranyl Protection of Amino Acid Side-Chains Enables Synthesis of a Hydroxamate-Containing Aminoacylated tRNA

机译:氨基酸侧链的四氢呋喃基和四氢吡喃基保护能够合成含异羟肟酸酯的氨基酰化tRNA。

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摘要

The ability to specifically engineer metal binding sites into target proteins has far-reaching consequences ranging from the development of new biocatalysts and imaging reagents to the production of proteins with increased stability. We report the efficient tRNA-mediated incorporation of the hydroxamate containing amino acid, Nε-acetyl-Nε-hydroxy->l-lysine, into a transcription factor (TFIIIA). Because this amino acid is compact, hydrophilic, and uncharged at physiological pH, it should have little or no effect on protein folding or solubility. The Nε-hydroxy group of the hydroxamate is refractory to photodeprotection and required the identification of reagents for O-protection that are compatible with the synthesis of acylated tRNA. Tetrahydrofuranyl and tetrahydropyranyl O-protecting groups can be removed using mild acid conditions and allowed for an orthogonal protection strategy in which deprotection of the amino acid side chain precedes ligation of an acylated dinucleotide to a truncated suppressor tRNA. These protecting groups will provide a valuable alternative for O-protection, especially in cases where photodeprotection cannot be used.
机译:特异地将金属结合位点工程化为目标蛋白质的能力具有深远的影响,从开发新的生物催化剂和显像剂到生产具有更高稳定性的蛋白质。我们报告了高效的tRNA介导的含有异羟肟酸酯的氨基酸N ε-乙酰基-N ε-羟基-> l -赖氨酸的掺入,成转录因子(TFIIIA)。由于该氨基酸是致密的,亲水的,并且在生理pH下不带电荷,因此它对蛋白质折叠或溶解度的影响很小或没有影响。异羟肟酸酯的N ε-羟基对光脱保护是难处理的,需要鉴定与酰化tRNA合成兼容的O-保护试剂。可以使用弱酸条件除去四氢呋喃基和四氢吡喃基的O保护基,并采用正交保护策略,在该策略中,氨基酸侧链的脱保护先于酰化的二核苷酸与截短的抑制子tRNA连接。这些保护基将为O保护提供有价值的替代方法,尤其是在不能使用光脱保护的情况下。

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