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J Biochem ; 163(3): 233-241, 2018 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-29092074

RESUMO

In most eubacteria, the minor AUA isoleucine codon is decoded by tRNAIle2, which has a lysidine (L) in the anticodon loop. The lysidine is introduced by tRNAIle-lysidine synthetase (TilS) through post-transcriptional modification of cytidine to yield an LAU anticodon. Some bacteria, Lactobacillus plantarum for example, possess two tRNAIle2(UAU) genes in addition to, two tRNAIle2(CAU) genes and the tilS gene. tRNA expression from all these genes would generate redundancy in a tRNA that decodes a rare AUA codon. In this study, we investigated the tRNA expression from these genes in L. plantarum and characterized the corresponding tRNAs. The tRNAIle2(CAU) gene products are modified by TilS to produce tRNAIle2(LAU), while tRNAIle2(UAU) lacks modification especially in the anticodon sequence. We found that tRNAIle2(LAU) is charged with isoleucine but tRNAIle2(UAU) is not. Our results suggest that the tRNAIle2 redundancy may be related to different roles of these tRNAs in the cell.


Assuntos
Anticódon/genética , Lactobacillus plantarum/genética , RNA de Transferência de Isoleucina/genética , Anticódon/metabolismo , Isoleucina/metabolismo , Lactobacillus plantarum/metabolismo , RNA de Transferência de Isoleucina/metabolismo , Espectrometria de Massas por Ionização e Dessorção a Laser Assistida por Matriz
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