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Transcriptional profiles of Haloferax mediterranei based on nitrogen availability

ABSTRACT: Transcriptional profiling of Haloferax mediterranei in three culture media with different nitrogen sources: a) cells were grown stationary and exponentially on ammonium, b) cells were grown exponentially on nitrate, and c) cells were shifted to nitrogen starvation conditions. The main differences in the transcriptional profiles have been identified between the cultures with ammonium as nitrogen source and the cultures with nitrate or nitrogen starvation, supporting previous results which indicate the absence of ammonium as the factor causing the expression of genes involved in nitrate assimilation pathway.

ORGANISM(S): Haloferax mediterranei

PROVIDER: GSE59551 | GEO | 2016/07/01

SECONDARY ACCESSION(S): PRJNA255558

REPOSITORIES: GEO

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Transcriptional profiles of Haloferax mediterranei based on nitrogen availability

Project description:Transcriptional profiling of Haloferax mediterranei in three culture media with different nitrogen sources: a) cells were grown stationary and exponentially on ammonium, b) cells were grown exponentially on nitrate, and c) cells were shifted to nitrogen starvation conditions. The main differences in the transcriptional profiles have been identified between the cultures with ammonium as nitrogen source and the cultures with nitrate or nitrogen starvation, supporting previous results which indicate the absence of ammonium as the factor causing the expression of genes involved in nitrate assimilation pathway. Four-conditions experiment with four biological replicates, combined in a loop design.

2016-07-01 | E-GEOD-59551 | biostudies-arrayexpress

Transcriptional analysis of glnA deletion mutant in Haloferax mediterranei

Project description:Transcriptional profiling of Haloferax mediterranei DglnA and HM26 strains in two different culture media: a) cells were grown exponentially on complex media + 40 mM Gln, b) cells were shifted to nitrogen starvation conditions (72h). In the Nsta(∆glnA)-Cx and Nsta-Cx contrasts, glnA2 was up-regulated, and glnA3 did not show any difference. Therefore, glnA2 and glnA3 were unable to compensate lack of glnA because either they do not properly encode GS or are not expressed under the same conditions.

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Exploring the molecular machinery of denitrification in Haloferax mediterranei through proteomics

Project description:Many proteins and enzymes involved in denitrification in haloarchaea can be inferred to be located between the cytoplasmic membrane and the S-layer, based on the presence of a Tat signal sequence and the orientation of the active site that some of these enzymes have. The membrane fraction of the haloarchaeon Haloferax mediterranei (R-4), grown under anaerobic conditions in the presence of nitrate, was solubilised to identify the respiratory proteins associated or anchored to it. Using Triton X-100, CHAPS and n-Octyl-β-d-glucopyranoside at different concentrations we found the best conditions for isolating membrane proteins in micelles, in which enzymatic activity and stability were maintained. Then, they were subjected to purification using two chromatographic steps followed by the analysis of the eluents by NANO-ESI Chip-HPLC-MS/MS. The results showed that the four main enzymes of denitrification (nitrate, nitrite, nitric oxide and nitrous oxide reductases) in H. mediterranei were identified and they were co-purified thanks to the micelles made with Triton X-100 (20% w/v for membrane solubilisation and 0.2% w/v in the buffers used during purification). In addition, several accessory proteins involved in electron transfer processes during anaerobic respiration as well as proteins supporting ATP synthesis, redox balancing and oxygen sensing were detected. This is the first characterization of anaerobic membrane proteome of haloarchaea under denitrifying conditions using liquid chromatography-mass spectrometry. It provides new information for a better understanding of the anaerobic respiration in haloarchaea.

2020-12-07 | PXD022473 | Pride

Dissecting the rice genes responsible for long time changes of nitrogen supply forms and nitrogen starvation

Project description:In comparison with provision of either ammonium or nitrate alone, simultaneously supplying both forms of N results in superior growth and yield for the majority of plants including rice. Using a rice 22K oligo-array, we performed transcriptome analysis to identify genes of rice (Oryza sativa L. ssp. japonica) responsive to change of N-supply forms and N-starvation. Using the supply of ammonium nitrate (one to one molar ratio) as control, the total number of root genes that were equal or more than two fold up- or down- regulated was 445, 324, and 781 by upon supply of either ammonium or nitrate or continuous N starvation, respectively for 96 h. In the shoot the equivalent numbers were much smaller only 32, 58, and 165, respectively. Clustering of the rice genes associated with different environmental stresses revealed substantial organ specificity of the root and shoot to N starvation, and also to the N supply form. Genes encoding transporters for ammonium and nitrate, nitrate reductase, glutamate dehydrogenase, and aspartate amino transferase, showed great response to change of the N supply form, especially to N starvation. Some of the genes involved in chlorophyll metabolism, carbon fixation and assimilation, were enhanced by ammonium supply only, but significantly suppressed by N-starvation. In the shoot there was increased expression of more general stress genes under nitrate when compared to ammonium nutrition. In the root the reverse situation was true with more apparent stress under ammonium nutrition. The microarray approach has revealed new levels of complexity in the response of rice to the form of N supply. Keywords: Rice; root; shoot; nitrogen starvation; nitrogen form; ammonium; nitrate; gene expression

2006-12-07 | GSE4409 | GEO

transcriptome of Amycolatopsis mediterranei U32 in the Bennet medium with or without nitrate

Project description:We reported transcriptome profiles of rifamycin SV-produced strain Amycolatopsis mediterranei U32 in the Bennet medium with or without 80 mM nitrate in different cultivation stage. By comparative analysis of genome-wide gene expression in these conditions, we found that the mechanism of high production of rifamycin SV induced by nitrate could be elucidated. Examination of 2 time-course transcription in 2 different nitrogen source conditions

2015-07-01 | E-GEOD-63313 | biostudies-arrayexpress

Measuring transcriptional differences between Caulobacter crescentus cultured in nitrate versus ammonium as the sole nitrogen source

Project description:This study is measuring the steady-state levels of mRNA in wild-type Caulobacter crescentus grown in M2 defined medium containing either ammonium or nitrate as the sole nitrogen source. Four independent cultures of Caulobacter crecentus were grown in each of two medium conditions: M2(nitrate)glucose and M2(ammonium)glucose. Cultures in each medium type were grown to OD660=0.3 and RNA was isolated from each.

2010-06-20 | E-GEOD-21203 | biostudies-arrayexpress

Genes differentially expressed Haloferax mediterranei strains: control wild-type strain vs ΔphaA1 strain

Project description:Transcriptional profiling of Haloferax mediterranei comparing control wild-type strain with ΔphaA1 strain, in which phaA1 gene are knockouted. ΔphaA1 strain can accumulate PHB only. Goal was to explore the PHA biosynthetic pathway and to determine their impact on primary metabolism in H. mediterranei.

2012-04-20 | GSE37420 | GEO

Genes differentially expressed Haloferax mediterranei strains: control wild-type strain vs ΔphaEC strain

Project description:Transcriptional profiling of Haloferax mediterranei comparing control wild-type strain with ΔphaEC strain, in which PHA synthase genes are knockouted. ΔphaEC strain is deficient in PHBV accumulation. Goal was to explore the PHBV biosynthetic pathway and to determine their impact on primary metabolism in H. mediterranei.

2012-04-20 | GSE37421 | GEO

Genes differentially expressed in Haloferax mediterranei strains, DF50 and ΔdeoR2, with or without induction by fructose

Project description:Transcriptional profiling of Haloferax mediterranei DF50 and ΔdeoR2 with induction by fructose comparing with the strains without this induction. Goal was to explore the effect of induction by fructose on Haloferax mediterranei.

2013-12-18 | GSE41134 | GEO

Comparison of root transcriptomes in Arabidopsis thaliana plants supplied with different forms of inorganic nitrogen

Project description:Plants aquire nitrogen from the soil, most commonly in the form of either nitrate or ammonium. Unlike ammonium, nitrate must be reduced (with NADH and ferredoxin as electron donors) prior to assimilation. Thus, nitrate nutrition imposes a substantially greater energetic cost than ammonium nutrition. Our goal was to compare the transcriptomes of nitrate-supplied and ammonium-supplied plants, with a particular interest in characterizing the differences in redox metabolism elicited by different forms of inorganic nitrogen. We used microarrays to compare the short-term transcriptional response to either nitrogen supply or ammonium supply in Arabidopsis roots. Genes upregulated or downregulated by nitrate only, ammonium only, or both ammonium and nitrate were identified and analyzed.

2011-05-28 | GSE29589 | GEO

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