Extended hydroxyarchaeol, a novel lipid biomarker for anaerobic methanotrophy in cold seepage habitats
作者： A. Stadnitskaia , I. Bouloubassi , M. Elvert , K.-U. Hinrichs , J.S. Sinninghe Damsté
DOI: 10.1016/J.ORGGEOCHEM.2008.04.019
关键词:
摘要: A new archaeal lipid biomarker, C 20,25 sn-2, C-7 hydroxy isoprenoid glycerol diether, has been identified in methane-related carbonates from six methane seep locations. The molecular structure resembles that of sn-2 hydroxyarchaeol but the group-bearing moiety at position comprises a regular 25 instead 20 chain. Compound specific stable carbon isotope measurements revealed δ 13 values ranging -96‰ to -129‰, which are similar hydroxyarchaeol. This supports origin novel compound archaea involved anaerobic oxidation methane. It also suggests common source, i.e. within ANME-2 group, is consistent with previously reported 16S rDNA data for same samples. frequent appearance isoprenoidal diether cold seepage sediments high salinity environments, and its distinct structural similarities membrane lipids ofhalophilic methanogenic microbes, methanotrophic thriving elevated possible biological source this lipid.
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