Suppression of amber codons in Caulobacter crescentus by the orthogonal Escherichia coli histidyl-tRNA synthetase/tRNAHis pair.
Suppression of amber codons in Caulobacter crescentus by the orthogonal Escherichia coli histidyl-tRNA synthetase/tRNAHis pair.
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DOI:
10.1371/journal.pone.0083630
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Söll D
中科院分区:
文献类型:
--
作者:
Ko JH;Llopis PM;Heinritz J;Jacobs-Wagner C;Söll D
While translational read-through of stop codons by suppressor tRNAs is common in many bacteria, archaea and eukaryotes, this phenomenon has not yet been observed in the α-proteobacterium Caulobacter crescentus. Based on a previous report that C. crescentus and Escherichia coli tRNAHis have distinctive identity elements, we constructed E. coli tRNAHis CUA, a UAG suppressor tRNA for C. crescentus. By examining the expression of three UAG codon- containing reporter genes (encoding a β-lactamase, the fluorescent mCherry protein, or the C. crescentus xylonate dehydratase), we demonstrated that the E. coli histidyl-tRNA synthetase/tRNAHis CUA pair enables in vivo UAG suppression in C. crescentus. E. coli histidyl-tRNA synthetase (HisRS) or tRNAHis CUA alone did not achieve suppression; this indicates that the E. coli HisRS/tRNAHis CUA pair is orthogonal in C. crescentus. These results illustrate that UAG suppression can be achieved in C. crescentus with an orthogonal aminoacyl-tRNA synthetase/suppressor tRNA pair.
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