Genetic Encoding of Three Distinct Noncanonical Amino Acids Using Reprogrammed Initiator and Nonsense Codons.
Genetic Encoding of Three Distinct Noncanonical Amino Acids Using Reprogrammed Initiator and Nonsense Codons.
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使用重编程起始子和无义密码子对三种不同的非规范氨基酸进行遗传编码。
DOI:
10.1021/acschembio.1c00120
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发表时间:
2021-04-16
影响因子:
4
通讯作者:
Söll D
中科院分区:
文献类型:
--
作者:
Tharp JM;Vargas-Rodriguez O;Schepartz A;Söll D
We recently described an orthogonal initiator tRNA (itRNATy2) that can initiate protein synthesis with noncanonical amino acids (ncAAs) in response to the UAG nonsense codon. Here, we report that a mutant of itRNATy2 (itRNATy2AUA) can efficiently initiate translation in response to the UAU tyrosine codon, giving rise to proteins with an ncAA at their N-terminus. We show that, in cells expressing itRNATy2AUA, UAU can function as a dual-use codon that selectively encodes ncAAs at the initiating position and predominantly tyrosine at elongating positions. Using itRNATy2AUA, in conjunction with its cognate tyrosyl-tRNA synthetase and two mutually orthogonal pyrrolysyl-tRNA synthetases, we demonstrate that UAU can be reassigned along with UAG or UAA to encode two distinct ncAAs in the same protein. Furthermore, by engineering the substrate specificity of one of the pyrrolysyl-tRNA synthetases, we developed a triply orthogonal system that enables simultaneous reassignment of UAU, UAG, and UAA to produce proteins containing three distinct ncAAs at precisely defined sites. To showcase the utility of this system, we produced proteins containing two or three ncAAs, with unique bioorthogonal functional groups, and demonstrate that these proteins can be separately modified with multiple fluorescent probes.
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DOI:
10.1038/nsb934
发表时间:
2003-06-01
期刊:
NATURE STRUCTURAL BIOLOGY
影响因子:
--
作者:
Kobayashi, T;Nureki, O;Yokoyama, S
通讯作者:
Yokoyama, S
影响因子:
46.9
作者:
Pédelacq, JD;Cabantous, S;Waldo, GS
通讯作者:
Waldo, GS
影响因子:
3.2
作者:
Krishnakumar, Radha;Prat, Laure;Soell, Dieter
通讯作者:
Soell, Dieter
影响因子:
8.4
作者:
Dumas A;Lercher L;Spicer CD;Davis BG
通讯作者:
Davis BG
影响因子:
3.5
作者:
Krishnakumar, Radha;Ling, Jiqiang
通讯作者:
Ling, Jiqiang