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Photosynthetic bacterium Rhodobacter alkalitolerans strain JA916T, Jul 25 '25

ABSTRACT: The study is done to compare the impact of high light on the photosynthetic bacterium Rhodobacter alkalitolerans strain JA916T when grown in high pH and neutral pH. After the analysis we found several photosynthetic and cell division transcripts to be differentially expressed. These transcripts were majorly from the bacteriochlorophyll and carotenoid biosynthesis pathway. Reaction center transcripts were also found to be highly upregulated in nhpH conditions. Similary cell division transcripts were also found to be highly upregulated in high light conditions. Further for detailed study the publication can be referred. This study is to be published in the article titled as " Integration of transcriptomics and metabolomics for understanding the global responses to neutral pH and high pH under high light in photosynthetic bacterium Rhodobacter alkalitolerans strain JA916T".

ORGANISM(S): Cereibacter alkalitolerans

PROVIDER: GSE304333 | GEO | 2025/08/21

REPOSITORIES: GEO

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Project description:Responses of photosynthetic organisms to sulfur starvation include (i) increasing the capacity of the cell for transporting and/or assimilating exogenous sulfate, (ii) restructuring cellular features to conserve sulfur resources, and (iii) modulating metabolic processes and rates of cell growth and division. We used microarray analyses to obtain a genome-level view of changes in mRNA abundances in the green alga Chlamydomonas reinhardtii during sulfur starvation. The work confirms and extends upon previous findings showing that sulfur deprivation elicits changes in levels of transcripts for proteins that help scavenge sulfate and economize on the use of sulfur resources. Changes in levels of transcripts encoding members of the light-harvesting polypeptide family, such as LhcSR2, suggest restructuring of the photosynthetic apparatus during sulfur deprivation. There are also significant changes in levels of transcripts encoding enzymes involved in metabolic processes (e.g., carbon metabolism), intracellular proteolysis, and the amelioration of oxidative damage; a marked and sustained increase in mRNAs for a putative vanadium chloroperoxidase and a peroxiredoxin may help prolong survival of C. reinhardtii during sulfur deprivation. Furthermore, many of the sulfur stress-regulated transcripts (encoding polypeptides associated with sulfate uptake and assimilation, oxidative stress, and photosynthetic function) are not properly regulated in the sac1 mutant of C. reinhardtii, a strain that dies much more rapidly than parental cells during sulfur deprivation. Interestingly, sulfur stress elicits dramatic changes in levels of transcripts encoding putative chloroplast-localized chaperones in the sac1 mutant but not in the parental strain. These results suggest various strategies used by photosynthetic organisms during acclimation to nutrient-limited growth. An all pairs experiment design type is where all labeled extracts are compared to every other labeled extract. Computed

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Photosynthetic bacterium Rhodobacter alkalitolerans strain JA916T, Jul 25 '25

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