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    Distribution of glycerol ether lipids in halophilic, methanogenic and hyperthermophilic archaea

    Access Status
    Fulltext not available
    Authors
    Bauersachs, T.
    Weidenbach, K.
    Schmitz, R.
    Schwark, Lorenz
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Bauersachs, T. and Weidenbach, K. and Schmitz, R. and Schwark, L. 2015. Distribution of glycerol ether lipids in halophilic, methanogenic and hyperthermophilic archaea. Organic Geochemistry. 83-84: pp. 101-108.
    Source Title
    Organic Geochemistry
    DOI
    10.1016/j.orggeochem.2015.03.009
    ISSN
    0146-6380
    School
    Department of Chemistry
    URI
    http://hdl.handle.net/20.500.11937/36673
    Collection
    • Curtin Research Publications
    Abstract

    Four representatives of methanogenic Euryarchaeota (Methanosarcina mazei strain Gö1, Methanosphaera stadtmanae, Methanobrevibacter smithii and Methanosaeta thermophila), the hyperthermophilic euryarchaeon Thermococcus kodakarensis and the halophilic euryarchaeon Haloferax volcanii were studied for their glycerol ether lipid composition. The predominant core membrane lipid in all of them was archaeol, which was accompanied by variable quantities of sn-2-hydroxyarchaeol in the methanogens M. mazei (Methanosarcinales) and M. stadtmanae (Methanobacteriales). All methanogenic and hyperthermophilic Euryarchaeota also contained comparatively high abundances of the glycerol dialkyl glycerol tetraether without a cyclopentane moiety (GDGT-0). The methanoarchaeon M. stadtmanae, in addition to GDGT-0, contained GDGT core lipid structures with 1-4 cyclopentane moieties (GDGTs 1-4). We also found minor amounts of a glycerol trialkyl glycerol tetraether (GTGT) and a glycerol dialkanol diether (GDD), both of which did not contain cyclopentane moieties, as well as methylated and dimethylated GDGT-0 in all the archaea with the exception of H. volcanii. Like its GDGT distribution, M. stadtmanae showed an extended range of GDD structures with up to two cyclopentane ring systems. Our results thus indicate that both methanogenic and hyperthermophilic Euryarchaeota may represent source organisms of GTGT-0, GDDs and methylated-GDGTs in natural environments. All the latter components have recently been reported to be ubiquitously distributed in marine sediments but their biological origin is largely unknown. Moreover, a suite of unsaturated GDGTs without a cyclopentane moiety and up to four double bonds in the hyperthermophile T. kodakarensis was tentatively assigned.

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