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Comparative RNA seq analysis of Salmonella enterica serovar Typhimurium and a pan methionine sulfoxide reductase gene deletion (Δ5msr mutant) strain

ABSTRACT: Salmonella enterica serovar Typhimurium (S. Typhimurium) is a major foodborne pathogen which suffers but survives oxidative stress. Methionine sulfoxide reductases (Msrs) are important antioxidant enzymes that protect cells from oxidative damage by reducing oxidized methionine residues (free) or bound in proteins, back to methionine. To examine the global transcriptional consequences of deleting all five known msr genes, RNA sequencing was performed on S. Typhimurium and Δ5msr mutant strains. This dataset provides a comprehensive transcriptomic resource for investigating the impact of msrs deletion on oxidative stress–associated regulatory pathways and cellular processes in S. Typhimurium.

ORGANISM(S): Salmonella enterica subsp. enterica serovar Typhimurium

PROVIDER: GSE318288 | GEO | 2026/02/05

REPOSITORIES: GEO

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Project description:Beech trees produce seeds irregularly, necessitating the storage of these seeds for forestation. Despite the acquisition of desiccation tolerance during development, beech seeds lose viability during long-term storage faster than orthodox-type seeds. Seeds stored for short (3 years) and long (20 years) periods under optimal conditions were compared. Aged seeds characterized with germination capacity reduced to 30% displayed increased membrane damage, manifested as electrolyte leakage and lipid peroxidation levels. Analyses have been based on embryonic axes containing higher levels of reactive oxygen species (ROS) and higher levels of protein-bound methionine sulfoxide (MetO) in aged seeds. Using gel-free shotgun proteomics, 3,949 proteins were identified and 2,442 were reliably quantified to indicate 25 proteins with upregulated abundance and 35 with downregulated abundance in beech seeds under long-term storage compared to those under short-term storage. Functional analyses based on gene ontology annotations revealed that nucleic acid binding activity (biological process), hydrolases (molecular function), ribosome organization or biogenesis and transmembrane transport (cellular processes), and ATP synthesis (pathway) were affected in aged seeds. To verify whether MetO the oxidative posttranslational modification of proteins reversed via the action of methionine sulfoxide reductase (Msr) enzymes is involved in ageing of beech seeds we identified 316 and reliably quantified 226 MetO-containing proteins, among which 9 and 19 exhibited significantly up- and downregulated MetO levels, respectively, in beech seeds under long-term storage. Several Msr isoforms were identified and recognized as MsrA1-like, MsrA4, MsrB5 and MsrB5-like in beech seeds. Only MsrA1-like displayed decreased abundance in aged seeds. We demonstrated that the loss of membrane integrity reflected in elevated abundance of membrane proteins had higher impact on seed ageing progress rather than MetO/Msr system.

Dataset Information

Comparative RNA seq analysis of Salmonella enterica serovar Typhimurium and a pan methionine sulfoxide reductase gene deletion (Δ5msr mutant) strain

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