Thermococcus
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ABSTRACT:
PROVIDER: PRJNA287920 | ENA |
REPOSITORIES: ENA
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Project description:The present study describes the isolation of a Thermococcus sp. strain 175 from the world‘s deepest hydrothermal vent sites known thus far – The Mid-Cayman Rise.consisting of two hydrothermal venting systems Bee Bee (or Piccard), at 4950m depth and Von Damm (or Walsh) at 2300m The strain is capable of growth over 0.1MPa (atm. Pressure) to 120MPa, the widest known range of pressure dependent growth. The study further explores piezophilic adaptation using comparative genomic tools. Insights into the transcriptome of this strain providers the first look into the transcriptional machinery of peizophilic Thermococci.
2017-08-22 | GSE70228 | GEO
Project description:In this study, we performed a global quantitative proteomic analysis under extreme temperatures, pH, hydrostatic pressure (HP) and salinity on an archaeal strain, Thermococcus eurythermalis A501. Here is the result of temperature adaptation: low temperature (65°C) and high temperature (95°C), and the optimal culture condition (85°C, pH 7, 2.3% NaCl, 0.1 MPa or 10 MPa) was used as the control.
2020-09-09 | PXD018991 | Pride
Project description:In this study, we performed a global quantitative proteomic analysis under extreme temperatures, pH, hydrostatic pressure (HP) and salinity on an archaeal strain, Thermococcus eurythermalis A501. Here is the result of pH adaptation: low pH (pH 4) and high pH (pH 9), and the optimal culture condition (85°C, pH 7, 2.3% NaCl, 0.1 MPa or 10 MPa) was used as the control.
2020-09-09 | PXD018974 | Pride
Project description:In this study, we performed a global quantitative proteomic analysis under extreme temperatures, pH, hydrostatic pressure (HP) and salinity on an archaeal strain, Thermococcus eurythermalis A501. Here is the result of NaCl adaptation: low salinity (1.5% NaCl, w/v) and high salinity (4.5% NaCl, w/v), and the optimal culture condition (85°C, pH 7, 2.3% NaCl, 0.1 MPa or 10 MPa) was used as the control.
2020-09-09 | PXD018994 | Pride
Project description:Growth and transcriptional profiles of the barophilic methanarchaeon Methanocaldococcus jannaschii were studied at temperatures up to 98C and pressures up to 500 atm. Application of 500 atm of hyperbaric pressure shifted the optimal growth temperature upwards, and heat shock from 88C to 98C at 500 atm resulted in termination of growth. Pressure shock of M. jannaschii from 7.8 to 500 atm over 15-min, the first pressure upshift reported for a barophile, did not accelerate growth. Transcriptional profiles indicated a similar pressure response under growth and heat shock at 500 atm and pressure shock to 500 atm suggesting that the commonly affected genes are important for high-pressure adaptation. Factorial microarray design allowed de-convolution of the interacting effect of elevated pressure and heat shock on expression profiles, thus suggesting genes that may contribute to the organism’s survival in the turbulent in situ conditions of deep-sea hydrothermal vents. Keywords: stress response, time course, high pressure, heat shock, pressure shock
2007-04-05 | GSE4620 | GEO
Project description:In this study, we performed a global quantitative proteomic analysis under extreme temperatures, pH, hydrostatic pressure (HP) and salinity on an archaeal strain, Thermococcus eurythermalis A501. Here is the result of pressure adaptation: HP (40 MPa) tested under 85°C and 95°C, and the optimal culture condition (85°C, pH 7, 2.3% NaCl, 10 MPa) was used as the control.
2020-09-09 | PXD019007 | Pride
Project description:Thermococcus gammatolerans, the most radioresistant archaeon known to date, is an anaerobic and hyperthermophilic sulfur-reducing organism living in deep-sea hydrothermal vents. Knowledge of mechanisms underlying archaeal metal tolerance in such metal-rich ecosystem is still poorly documented. We showed that T. gammatolerans exhibits high resistance to cadmium (Cd), cobalt (Co) and zinc (Zn), a weaker tolerance to nickel (Ni), copper (Cu) and arsenate (AsO4) and that cells exposed to 1mM Cd exhibit a cellular Cd concentration of 67µM. A time-dependent transcriptomic analysis using microarrays was performed at a non-toxic (100μM) and a toxic (1mM) Cd dose. The reliability of microarray data was strengthened by real time RT-PCR validations. Altogether, 114 Cd responsive genes were revealed and a substantial subset of genes is related to metal homeostasis, drug detoxification, re-oxidization of cofactors and ATP production. This first genome-wide expression profiling study of archaeal cells challenged with Cd showed that T. gammatolerans withstands induced stress through pathways observed in both prokaryotes and eukaryotes but also through new and original strategies. T. gammatolerans cells challenged with 1mM Cd basically promote: 1) the induction of several transporter/permease encoding genes, probably to detoxify the cell; 2) the upregulation of Fe transporters encoding genes to likely compensate Cd damages in iron-containing proteins; 3) the induction of membrane-bound hydrogenase (Mbh) and membrane-bound hydrogenlyase (Mhy2) subunits encoding genes involved in recycling reduced cofactors and/or in proton translocation for energy production. By contrast to other organisms, redox homeostasis genes appear constitutively expressed and only a few genes encoding DNA repair proteins are regulated. We compared the expression of 27 Cd responsive genes in other stress conditions (Zn, Ni, heat shock, γ-rays), and showed that the Cd transcriptional pattern is comparable to other metal stress transcriptional responses (Cd, Zn, Ni) but not to a general stress response.
2012-08-01 | GSE13546 | GEO
Project description:Thermococcus gammatolerans, the most radioresistant archaeon known to date, is an anaerobic and hyperthermophilic sulfur-reducing organism living in deep-sea hydrothermal vents. Knowledge of mechanisms underlying archaeal metal tolerance in such metal-rich ecosystem is still poorly documented. We showed that T. gammatolerans exhibits high resistance to cadmium (Cd), cobalt (Co) and zinc (Zn), a weaker tolerance to nickel (Ni), copper (Cu) and arsenate (AsO4) and that cells exposed to 1mM Cd exhibit a cellular Cd concentration of 66M-BM-5M. A time-dependent transcriptomic analysis using microarrays was performed at a non-toxic (100M-NM-<M) and a toxic (1mM) Cd dose. The reliability of microarray data was strengthened by real time RT-PCR validations. Altogether, 114 Cd responsive genes were revealed and a substantial subset of genes is related to metal homeostasis, drug detoxification, re-oxidization of cofactors and ATP production. This first genome-wide expression profiling study of archaeal cells challenged with Cd showed that T. gammatolerans withstands induced stress through pathways observed in both prokaryotes and eukaryotes but also through new and original strategies. T. gammatolerans cells challenged with 1mM Cd basically promote: 1) the induction of several transporter/permease encoding genes, probably to detoxify the cell; 2) the upregulation of Fe transporters encoding genes to likely compensate Cd damages in iron-containing proteins; 3) the induction of membrane-bound hydrogenase (Mbh) and membrane-bound hydrogenlyase (Mhy2) subunits encoding genes involved in recycling reduced cofactors and/or in proton translocation for energy production. By contrast to other organisms, redox homeostasis genes appear constitutively expressed and only a few genes encoding DNA repair proteins are regulated. We compared the expression of 27 Cd responsive genes in other stress conditions (Zn, Ni, heat shock, M-NM-3-rays), and showed that the Cd transcriptional pattern is comparable to other metal stress transcriptional responses (Cd, Zn, Ni) but not to a general stress response. Kinetics of gene expression changes induced by Cd were performed at two different concentrations (0.1mM and 1mM) and at 3 time points (30, 120 and 270 min). A 0.1mM Cd concentration did not affect the growth rate, whereas 1mM Cd induced a transitory growth arrest for 270min. Late exponentially growing cells (7x107 cells/mL) were exposed to Cd and were collected after 30min, 120 min and after 270 min. For each time point, four slides containing the 2157 oligonucleotide gene probes printed in duplicate were hybridized. The experiment was repeated twice leading to eight data sets per time point (four per biological replicate). Microarray analyses monitored 161 transcriptional changes (M-bM-^NM-^_Fold Change (FC)M-bM-^NM-^\M-bM-^IM-%2 and p-Value M-bM-^IM-$ 0.01) in response to Cd exposure corresponding to 114 unique genes i.e. 5,3% of T. gammatolerans gene content, most of them being upregulated. While about 25% of the upregulated genes exhibited a FC>3 with a maximum of almost 10 for one encoding a conserved hypothetical protein (tg0885, 1mM Cd at 120min), the large majority of the up- and down-regulated genes exhibited a 2 to 3-fold transcriptional change as already described in many archaeal transcriptomic studies.
2012-07-31 | E-GEOD-13546 | biostudies-arrayexpress
Project description:Physiological and gene expression studies of deep-sea bacteria under pressure conditions similar to those experienced in their natural habitat are critical to understand growth kinetics and metabolic adaptations to in situ conditions. The Epslilonproteobacterium, Nautilia sp. strain PV1, was isolated from hydrothermal fluids released from an active deep-sea hydrothermal vent at 9°N on the East Pacific Rise. Using a high pressure/high temperature continuous culture system we established that strain PV-1 has the shortest generation time of all known piezophilic microorganisms and we investigated its protein expression pattern in response to different hydrostatic pressures. Proteomic analyses of strain PV-1 grown at 200 Bars and 5 Bars showed that pressure adaptation is not restricted only to stress response or homeoviscous adaptation, but that it is more diversified and protein specific, with a fine and variegated regulation of enzymes involved even in the same metabolic pathway. As previously reported, proteins synthesis, motility, transport and energy metabolism are all affected by pressure, although to different extents. In strain PV-1, low pressure condition seems to activate the synthesis of phage-related proteins and an overexpression of enzymes involved in central carbon metabolism.
2023-05-10 | PXD022895 | Pride