Calorimetry of archaeal tetraether lipid—indication of a novel metastable thermotropic phase in the main phospholipid from Thermoplasma acidophilum cultured at 59°C

Ernst, Marc O.; Freisleben, Hans-Joachim; Antonopoulos, E; Henkel, L.; Mlekusch, Walter; Reibnegger, Gilbert

doi:10.1016/s0009-3084(98)00004-8

Cited by 15 publications

(18 citation statements)

References 20 publications

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“…The percentage of acyclic archaeal lipids in sample OC-114m is 30%, the percentage of mono-, bi-, and tricyclic archaeal lipids was 27, 23, and 20%, respectively. The high relative abundance of cyclic compounds (70 %) relative to the acyclic compounds (30%) is consistent with hyperthermophillic archaea (Ernst et al, 1998;Uda et al, 2001;De Rosa et al, 1980). The presence of > C 40 acyclic isoprenoids may indicate derivatives of H-type Caldarchaeols having C 80 -isoprenoid carbon chains that derive from the hyperthermophilic methogen Methanothermus fervidus (Morri et al, 1998).…”

Section: Origin Of Type II Ucmsmentioning

confidence: 73%

Analysis of unresolved complex mixtures of hydrocarbons extracted from Late Archean sediments by comprehensive two-dimensional gas chromatography (GC×GC)

Ventura

Kenig

Reddy

et al. 2008

Organic Geochemistry

114

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Hydrocarbon mixtures too complex to resolve by traditional capillary gas chromatrography display gas chromatograms with dramatically rising baselines or "humps" of coeluting compounds that are termed unresolved complex mixtures (UCMs). Because the constituents of UCMs are not ordinarily identified, a large amount of geochemical information is never explored. Gas chromatograms of saturated/unsaturated hydrocarbons extracted from Late Archean argillites and greywackes of the southern Abitibi Province of Ontario, Canada contain UCMs with different appearances or "topologies" relating to the intensity and retention time of the compounds comprising the UCMs. These topologies appear to have some level of stratigraphic organization, such that samples collected at any stratigraphic formation collectively are dominated by UCMs that either elute early-(within a window of C 15 -C 20 of n-alkanes), earlyto mid-(C 15 -C 30 of n-alkanes), or have a broad UCM that extends through the entire retention time of the sample (from C 15 -C 42 of n-alkanes). Comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry (GC×GC-MS) was used to resolve the constituents forming these various UCMs. Early-to mid-eluting UCMs are dominated by configurational isomers of alkyl-substituted and non substituted polycyclic compounds that contain up to six rings. Late eluting UCMs are composed of C 36 -C 40 mono-, bi-, and tricyclic archaeal isoprenoid diastereomers. Broad UCMs spanning the retention time of compound elution contain nearly the same compounds observed in the early-, mid-, and late retention time UCMs. Although the origin of the polycyclic compounds is unclear, the variations in the UCM topology appear to depend on the concentration of initial compound classes that have the potential to become isomerized. Isomerization of these constituents may have resulted from hydrothermal alteration of organic matter.

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Section: Origin Of Type II Ucmsmentioning

confidence: 73%

Analysis of unresolved complex mixtures of hydrocarbons extracted from Late Archean sediments by comprehensive two-dimensional gas chromatography (GC×GC)

Ventura

Kenig

Reddy

et al. 2008

Organic Geochemistry

114

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“…In a given thermoacidophile or a hyperthermophilic neutrophile, the number of cyclopentane rings in each biphytanyl chain increases with increasing growth temperature (De Rosa et al, 1979, 1980, 1983bLai et al, 2008;Schouten et al, 2002Schouten et al, , 2003Shimada et al, 2008;Uda et al, 2001Uda et al, , 2004Ernst et al, 1998) (Table 1 and Fig. 3).…”

Section: Structural Featuresmentioning

confidence: 99%

Archaebacterial bipolar tetraether lipids: Physico-chemical and membrane properties

Chong

2010

Chemistry and Physics of Lipids

125

117

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“…There exist several different routes, as follows. (1) The incorporation of cyclopentane rings along the isoprenoid chain as a function of fluctuating temperature (De Rosa et al 1980a, b;Ernst et al 1998;Uda et al 2001Uda et al , 2004 or pH (Shimada et al 2008) increases the packing efficiency of the membrane lipids (Gliozzi et al 1983), which increases membrane stability as a function of increasing temperature or salinity and decreasing pressure or pH, and consequently lowers the permeability (Chong et al 2012). …”

Section: Physiology and Adaptationmentioning

confidence: 99%

Microbial diversity and adaptation to high hydrostatic pressure in deep-sea hydrothermal vents prokaryotes

et al. 2015

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Prokaryotes inhabiting in the deep sea vent ecosystem will thus experience harsh conditions of temperature, pH, salinity or high hydrostatic pressure (HHP) stress. Among the fifty-two piezophilic and piezotolerant prokaryotes isolated so far from different deep-sea environments, only fifteen (four Bacteria and eleven Archaea) that are true hyper/thermophiles and piezophiles have been isolated from deep-sea hydrothermal vents; these belong mainly to the Thermococcales order. Different strategies are used by microorganisms to thrive in deep-sea hydrothermal vents in which "extreme" physico-chemical conditions prevail and where non-adapted organisms cannot live, or even survive. HHP is known to impact the structure of several cellular components and functions, such as membrane fluidity, protein activity and structure. Physically the impact of pressure resembles a lowering of temperature, since it reinforces the structure of certain molecules, such as membrane lipids, and an increase in temperature, since it will also destabilize other structures, such as proteins. However, universal molecular signatures of HHP adaptation are not yet known and are still to be deciphered.

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Calorimetry of archaeal tetraether lipid—indication of a novel metastable thermotropic phase in the main phospholipid from Thermoplasma acidophilum cultured at 59°C

Cited by 15 publications

References 20 publications

Analysis of unresolved complex mixtures of hydrocarbons extracted from Late Archean sediments by comprehensive two-dimensional gas chromatography (GC×GC)

Analysis of unresolved complex mixtures of hydrocarbons extracted from Late Archean sediments by comprehensive two-dimensional gas chromatography (GC×GC)

Archaebacterial bipolar tetraether lipids: Physico-chemical and membrane properties

Microbial diversity and adaptation to high hydrostatic pressure in deep-sea hydrothermal vents prokaryotes

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