β-Lysine discrimination by lysyl-tRNA synthetase.

β-Lysine discrimination by lysyl-tRNA synthetase.
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赖氨酸-TRNA合成酶歧视β-赖氨酸。

DOI:
10.1016/j.febslet.2011.09.008
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发表时间:
2011-10-20
期刊:
影响因子:
3.5
通讯作者:
Ibba M
Ibba M
中科院分区:
生物学3区
文献类型:
--
作者:
Gilreath MS;Roy H;Bullwinkle TJ;Katz A;Navarre WW;Ibba M

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延伸因子P被赖氨酸- trna合成酶(LysRS)平行物PoxA修饰为(R)-赖氨酸。PoxA的特异性与LysRS是正交的,尽管它们的相似性很高。为了研究LysRS和PoxA对-赖氨酸和-赖氨酸的识别,在PoxA结构的引导下,在LysRS活性位点进行了氨基酸替换。A233S LysRS表现为具有-赖氨酸的野生型,而G469A和A233S/G469A变体稳定地减少了-赖氨酸腺苷酸的形成。A233S LysRS比野生型更能识别-赖氨酸,表明该残基在区分-和-氨基酸中起作用。-赖氨酸的两种对映体都是LysRS对tRNA氨基酰化的底物,这与A233S变体的松弛特异性一起,表明了开发体内共翻译插入-氨基酸系统的可能方法。
Elongation factor P is modified with (R)- -lysine by the lysyl-tRNA synthetase (LysRS) paralog PoxA. PoxA specificity is orthogonal to LysRS, despite their high similarity. To investigate - and -lysine recognition by LysRS and PoxA, amino acid replacements were made in the LysRS active site guided by the PoxA structure. A233S LysRS behaved as wild type with -lysine, while the G469A and A233S/G469A variants decreased stable -lysyl-adenylate formation. A233S LysRS recognized -lysine better than wildtype, suggesting a role for this residue in discriminating - and -amino acids. Both enantiomers of -lysine were substrates for tRNA aminoacylation by LysRS, which, together with the relaxed specificity of the A233S variant, suggest a possible means to develop systems for in vivo co-translational insertion of -amino acids.
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