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Molecular study on Haloarchaea metagenomic assembly

ABSTRACT: EMG produced TPA metagenomics assembly of the Molecular study on haloarchaea producing industerially important enzymes (Molecular study on Haloarchaea) data set

PROVIDER: PRJEB22526 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	OBKM01.dat.gz	Other
	OBKM01.fasta.gz	Fasta.gz
	OBKM01.master.dat	Other
	OBKM01.dat.gz	Other

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Molecular study on Haloarchaea

Project description:Molecular study on haloarchaea producing industerially important enzymes

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Sucrose metabolism in haloarchaea: reassessment using genomics, proteomics and metagenomics

Project description:We used quantitative proteomics (8-plex iTRAQ labeling) to investigate pathways and enzymes potentially important for sucrose metabolism in the halophilic archaeon Halohasta litchfieldiae. The data provided insights into the dynamics of the Hht. litchfieldiae proteome in response to sucrose, advancing the understanding of sucrose and fructose metabolism in haloarchaea.

2019-01-31 | PXD010137 | Pride

Xylan utilization by haloarchaea-nanohaloarchaea associations

Project description:In hypersaline brines, biodegradation of recalcitrant plant polymers can be inhibited by salt-induced microbial stress and/or caused by inadequate metabolic capabilities of extremely halophilic microbes. Therefore, woody materials can be well-preserved even in NaCl brines that are less biologically hostile than most other brines. Here, we considered whether the nanohaloarchaea, that live alongside (the related) haloarchaea, ever partake in the degradation of xylan, a major hemicellulose component of wood. Samples were taken from natural evaporitic brines and anthropogenic solar salterns located in various parts of Europe and Asia. We recently demonstrated that nanohaloarchaeon Ca. Nanohalobium constans lives as an ectosymbiont associated with the chitinolytic haloarchaeon Halomicrobium. Here, we describe an extremely halophilic xylan-degrading consortium with three members, where nanohaloarchaea act as ectosymbionts of Haloferax lucertensis, which in turn acts as a scavenger of xylan-degradation products, produced by a primary xylan hydrolytic Halorhabdus species. The two corresponding binary associations of nanohaloarchaea, Candidatus Nanohalococcus occultus SVXNc and Candidatus Nanohalovita haloferacivicina BNXNv and their hosts were obtained, stably cultivated and characterized. In contrast to the previously described association of chitinolytic haloarchaeon Halomicrobium and its amylolytic symbiont Ca. Nanohalobium, the host haloarchaea within the xylan-degrading consortium could metabolize α-glucans (glycogen and starch), and, thus, obtained no obvious trophic benefit from ectosymbionts. The current study has broadened the range of culturable ectosymbiontic nanohaloarchaea and demonstrates that they are an important ecophysiological component of polysaccharide-degrading halophilic microbial communities and can be readily isolated in binary co-cultures by using the appropriate enrichment strategy.

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soil metagenome metagenomic assembly

Project description:EMG produced TPA metagenomics assembly of the Metagenome study of rice samples under various conditions (soil metagenome) data set

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Post-transcriptional regulation of redox homeostasis by the small RNA SHOxi in haloarchaea

Project description:Oxidative stress responsive small non-coding RNAs (sRNAs) have been reported in the model archaeon, Haloferax volcanii, but targets and mechanisms of actions have not been elucidated. While haloarchaea are highly resistant to oxidative stress, a comprehensive understanding of the mechanisms regulating this remarkable response is lacking. Here, using a combination of high throughput and reverse molecular genetic approaches we elucidated the functional role of the most up-regulated intergenic sRNA during oxidative stress in H. volcanii, aptly named Small RNA in Haloferax Oxidative Stress (SHOxi). We demonstrated that SHOxi is a functional non-coding RNA that plays gene regulatory roles in the oxidative stress response of an extremophilic archaeon. We found that SHOxi likely regulates redox homeostasis during oxidative stress by the post-transcriptional destabilization of malic enzyme mRNA. The decrease in the NAD+/NADH ratio resulting from the direct RNA-RNA interaction between SHOxi and its trans-target is instrumental in the survival of H. volcanii. The regulatory effects of SHOxi provides evidence that the fine-tuning of metabolic cofactors could be a core strategy to mitigate damage from oxidative stress and confer resistance. This study is the first to establish the regulatory effects of sRNAs on mRNAs during the oxidative stress response in Archaea.

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