Preservation and evolution of organic matter during experimental fossilisation of the hyperthermophilic archaea Methanocaldococcus jannaschii

Autor: Nadege Bienvenu, Jean-Robert Disnar, François Orange, Frances Westall, Daniel Prieur, Nathalie Lottier, Pascale Gautret
Přispěvatelé: Centre de biophysique moléculaire (CBM), Université d'Orléans (UO)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Université de Brest (UBO)
Rok vydání: 2011
Předmět:
Geologic Sediments
Chromatography
Gas
[SDE.MCG]Environmental Sciences/Global Changes
Origin of Life
010502 geochemistry & geophysics
01 natural sciences
Gas Chromatography-Mass Spectrometry
Organic molecules
03 medical and health sciences
Molecular level
Extracellular polymeric substance
Organic matter
Fatty acids
Organic Chemicals
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces
environment
Ecology
Evolution
Behavior and Systematics
Chromatography
High Pressure Liquid
030304 developmental biology
0105 earth and related environmental sciences
chemistry.chemical_classification
0303 health sciences
biology
Fossils
Monosaccharides
Methanococcales
Methanocaldococcus jannaschii
General Medicine
Fossilisation
biology.organism_classification
Archaea
Biological Evolution
Amino acid
chemistry
Biochemistry
Space and Planetary Science
Amino acids
Zdroj: Origins of Life and Evolution of Biospheres
Origins of Life and Evolution of Biospheres, Springer Verlag, 2012, 42, pp.587-609. ⟨10.1007/s11084-012-9318-x⟩
ISSN: 1573-0875
0169-6149
DOI: 10.1007/s11084-012-9318-x⟩
Popis: International audience; Identification of the earliest traces of life is made difficult by the scarcity of the preserved microbial remains and by the alteration and potential contamination of the organic matter (OM) content of rocks. These factors can confuse interpretations of the biogenicity and syngenicity of fossilised structures and organic molecules found in ancient rocks. In order to improve our knowledge of the fossilisation processes and their effects at the molecular level, we made a preliminary study of the fate of OM during experimental fossilisation. Changes in the composition and quantity of amino acids, monosaccharides and fatty acids were followed with HPLC, GC and GC-MS analyses during 1 year of silicification of the hyperthermophilic Archaea Methanocaldococcus jannaschii. Although the cells themselves did not fossilise and the accompanying extracellular polymeric substances (EPS) did, our analyses showed that the OM initially present in both cells and EPS was uniformly preserved in the precipitated silica, with amino acids and fatty acids being the best preserved compounds. This study thus completes previous data obtained by electron microscopy investigations of simulated microbial fossilisation and can help better identification and interpretation of microbial biosignatures in both ancient rocks and in recent hydrothermal formations and sediments.
Databáze: OpenAIRE
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