Project description:Here, we compared gene expression level by RNA-Seq analysis among a wild-type (WT) Deinococcus geothermalis strain, a dgeo_2840 of LysR family member gene (Δdgeo_2840), a putative Dps dgeo_0257 (Δdgeo_0257), and a cystine importer dgeo_1986-1987 gene disrupted strain (Δdgeo_1986-1987). From this transcriptomic data, we detected dgeo_2840, dgeo_0257, and dgeo_1986-1987 controlling genes which were somehow up-regulated and/or down-regulated. In particular, Deinococcus geothermalis has a total of 73 insertion sequences (ISs) in genomes, and some of them are actively transposed to other loci with replicative mode by the oxidative stress of hydrogen peroxide treatment.
Project description:Stress response of Methylococcus capsulatus str.Bath toward hydrogen sulfide (H2S) was investigated via physiological study and transcriptomic profiling. M. capsulatus (Bath) can grow and tolerate up to 0.75%vol H2S in headspace. Vast change in pH suggests biological relevant sulfide oxidation. Dozens of H2S-sensitive genes were identified from comparison of cell transcriptome in different H2S concentrations. Mc sulfide quinone reductase (SQR) and persulfide dioxygenase were found to be active during sulfide detoxification. Moreover, xoxF, a novel lanthanide(Ln)-dependent methanol dehydrogenase (MDH) was overexpressed in H2S while mxaF, a calcium-dependent MDH, was down-regulated, and such MDH switch phenomenon is also well known to be induced by addition of lanthanide via an as-yet-unknown mechanism. Activities in quorum sensing and RND efflux pump also suggest their role in sulfide detoxification, and might provide insight on the xoxF/mxaF switch mechanism.