Project description:Investigation of whole genome gene expression level changes in Thermoplasma acidophilum cultured under aerobic and anaerobic conditions. The analysis are further described in Na Sun, Cuiping Pan, Stephan Nickell, Matthias Mann, Wolfgang Baumeister, and István Nagy, Quantitative proteome and transcriptome analysis of the archaeon Thermoplasma acidophilum cultured under aerobic and anaerobic conditions (submitted).
Project description:Gene-expression measurements were made over a 20 minute time course as steady state E. coli cells were subjected to an anaerobic to aerobic or an aerobic to anaerobic environmental change.
Project description:Transcript abundance profiles were examined over the first 24 hours of germination in rice grown under anaerobic conditions. Transcript abundance profiles were also examined for rice grown under aerobic conditions for 24 h and then switched to anaerobic conditions and vice versa.
Project description:The changes in protein composition of E. coli were studied in a global proteomic approach for aerobic growth without or with fumarate as carbon source (glycerol + O2, fumarate + O2, respectively) and anaerobic growth without or with fumarate as carbon source (glycerol + DMSO, glycerol + DMSO + fumarate, respectively). The experiments should unravel the changes in response to fumarate under aerobic (i) and anaerobic (ii) conditions, and more generally (iii) the fumarate proteome under aerobic versus anaerobic conditions. Fumarate was used as the C4DC due to its capability to support aerobic and anaerobic growth, and glycerol was used as the alternative carbon source that exerts no or only weak carbon catabolite repression.
Project description:Transcriptomic study of A. ferrooxidans was explored either during aerobic growth with sulfur as an electron source and oxygen as final electron acceptor or in anaerobic conditions with ferric iron as the final electron receptor. Differential RNA levels were related to changes in cellular functions that were used to develop a preliminary model for A. ferrooxidans electron transport during dissimilatory ferric iron reduction.
Project description:Transcriptional profiling of Paracoccus denitrificans PD1222 wild type incubated in continuous culture (continuous culture (CSTR)) in minimal media with aerobic or anaerobic conditions. The goal was to define the core respiratory genes.
Project description:Actinobacillus pleuropneumoniae is an important porcine respiratory pathogen causing great economic losses in the pig industry worldwide. Oxygen deprivation is a stress that A. pleuropneumoniae will encounter during both early infection and the later, persistent stage. To understand modulation of A. pleuropneumoniae gene expression in response to the stress caused by anaerobic conditions, gene expression profiles under anaerobic and aerobic conditions were compared in this study. The microarray results showed that 631 genes (27.7% of the total ORFs) were differentially expressed in anaerobic conditions. Many genes encoding proteins involved in glycolysis, carbon source uptake systems, pyruvate metabolism, fermentation and the electron respiration transport chain were up-regulated. These changes led to an increased amount of pyruvate, lactate, ethanol and acetate in the bacterial cells as confirmed by metabolite detection. Genes encoding proteins involved in cell surface structures, especially biofilm formation, peptidoglycan biosynthesis and lipopolysaccharide biosynthesis were up-regulated as well. Biofilm formation was significantly enhanced under anaerobic conditions. These results indicate that induction of central metabolism is important for basic survival of A. pleuropneumoniae after a shift to an anaerobic environment. Enhanced biofilm formation may contribute to the persistence of this pathogen in the damaged anaerobic host tissue and also in the early colonization stage. These discoveries give new insights into adaptation mechanisms of A. pleuropneumoniae in response to environmental stress. Transcriptional profiles were analyzed using microarray to compare the gene expressions of A. pleuropneumoniae cultured under aerobic and anaerobic condition. The bacteria was cultured under aerobic condition to mid-log phase (3 hours) and then divided into two separate groups, one group was continually cultured under aerobic condition for 1 hour (OD600nm = 0.417 M-BM-1 0.008) and the other group was cultured under anaerobic condition for 1 hour (OD600nm = 0.333 M-BM-1 0.015). Three independent biological replicates were performed. The total RNA were extracted and hybridized with the whole genome microarray of A. pleuropneumoniae. The signal intensities were normalized and transformed into log2 values. The genes with P-value < 0.05 were selected as differentially expressed genes.
Project description:we performed time series microarray analyses to investigate transcriptome dynamics during the transition from anaerobic photosynthesis to aerobic respiration. Published on J. Bacteriol., 190 (1), 286-299, 2008. Major changes in gene expression profiles occurred in the initial 15 min after the shift from anaerobic-light to aerobic-dark conditions, with changes continuing to occur up to 4 hours postshift. Those genes whose expression levels changed significantly during the time series were grouped into three major classes by clustering analysis. Class I contained genes, such as that for the aa3 cytochrome oxidase, whose expression levels increased after the shift. Class II contained genes, such as those for the photosynthetic apparatus and Calvin cycle enzymes, whose expression levels decreased after the shift. Class III contained genes whose expression levels temporarily increased during the time series. Keywords: time course
