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- W2969523450 abstract "Methionine is critical for variety of metabolic processes in biological organisms, acting as a precursor or intermediate for many final products. The last step for the synthesis of methionine is the methylation of homocysteine, which is catalyzed by MetE. Here, we use Salmonella enterica serovar Typhimurium LT2 to study the regulation of the metE+ gene by an anaerobically induced small non-coding RNA-FnrS, the expression of which is strictly dependent on the anaerobic regulator-FNR. The MetE-HA protein was expressed at an increased level in the fnrS- and hfq- deficient strains under anaerobic conditions. The Hfq protein is predicted to stabilize the binding between small RNA(s) and their target mRNA(s). A transcriptional (op) and translational (pr) metE::lacZ fusion gene were separately constructed, with the metE+-promoter fused to a lacZ reporter gene. In an anaerobic environment, the metE::lacZ (pr) fusion gene and reverse transcription-PCR identified that FnrS and/or FNR negatively regulate metE+ mRNA levels in the rich media. Analysis of FnrS revealed a sequence complementary to the 5′ mRNA translational initiation region (TIR) of the metE+ gene. Mutation(s) predicted to disrupt base pairing between FnrS and metE+ TIR were constructed in fnrS, and most of those resulted in the loss of repressive activity. When compensatory mutation(s) were made in metE+ 5′ TIR to restore base pairing with FnrS, the repressive regulation was completely restored. Therefore, in this study, we identified that in anaerobic phase, there is a repression of metE+ gene expression by FnrS and that base-paring, between both expressive transcripts, plays an important role for this negative regulation." @default.
- W2969523450 created "2019-08-29" @default.
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- W2969523450 date "2019-12-01" @default.
- W2969523450 modified "2023-10-09" @default.
- W2969523450 title "Regulation of metE mRNA expression by FnrS small RNA in Salmonella enterica serovar Typhimurium" @default.
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- W2969523450 doi "https://doi.org/10.1016/j.micres.2019.126319" @default.
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