Occurrence of 1-O-monoalkyl glycerol ether lipids in ocean waters and sediments

Hernández-Sánchez, María Teresa; Homoky, William B.; Pancost, Richard D.

doi:10.1016/j.orggeochem.2013.10.003

Cited by 31 publications

(21 citation statements)

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“…It is possible that hydroxylated IPLs play a role during oxidative stress and/or are involved in other defense mechanisms (Kato et al, 1984;Andreou et al, 2009). Mixed ether-acyl lipids have been reported in various oceanic settings (Hernandez-Sanchez et al, 2014). In our study, there was no noticeable correlation between PE-and PC-AEG and depth or oxygen concentrations (Fig.…”

Section: Factors Affecting Structural Diversity Of the Core Lipid Comsupporting

confidence: 45%

“…In the ETNP, MAGEbased phospholipids were 1 % to 30 % of total IPLs. MAGE, detected as core lipids in surface waters of the Southern Ocean and eastern South Atlantic, are thought to be breakdown products of IP-AEGs of an aerobic bacterial origin (Hernandez-Sanchez et al, 2014), but culturing experiments have yet to confirm this conclusion. Similarly, aerobic bacteria (possibly cyanobacteria) are likely sources for SQ-AEG, since sulfoquinovosyl is a diagnostic head group found in cyanobacteria, although, again, these lipids have not been reported in cultured cyanobacteria.…”

Section: Oxic Zonementioning

confidence: 99%

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Intact polar lipids in the water column of the eastern tropical North Pacific: abundance and structural variety of non-phosphorus lipids

et al. 2018

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Abstract. Intact polar lipids (IPLs) are the main building blocks of cellular membranes and contain chemotaxonomic, ecophysiological and metabolic information, making them valuable biomarkers in microbial ecology and biogeochemistry. This study investigates IPLs in suspended particulate matter (SPM) in the water column of the eastern tropical North Pacific Ocean (ETNP), one of the most extensive open-ocean oxygen minimum zones (OMZs) in the world, with strong gradients of nutrients, temperature and redox conditions. A wide structural variety in polar lipid head-group composition and core structures exists along physical and geochemical gradients within the water column, from the oxygenated photic zone to the aphotic OMZ. We use this structural diversity in IPLs to evaluate the ecology and ecophysiological adaptations that affect organisms inhabiting the water column, especially the mid-depth OMZ in the context of biogeochemical cycles. Diacylglycerol phospholipids are present at all depths, but exhibit the highest relative abundance and compositional variety (including mixed acyl/ether core structures) in the upper and core OMZ where prokaryotic biomass was enriched. Surface ocean SPM is dominated by diacylglycerol glycolipids that are found in photosynthetic membranes. These and other glycolipids with varying core structures composed of ceramides and hydroxylated fatty acids are also detected with varying relative abundances in the OMZ and deep oxycline, signifying additional non-phototrophic bacterial sources for these lipids. Betaine lipids (with zero or multiple hydroxylations in the core structures) that are typically assigned to microalgae are found throughout the water column down to the deep oxycline but do not show a depth-related trend in relative abundance. Archaeal IPLs comprised of glycosidic and mixed glycosidic-phosphatidic glycerol dibiphytanyl glycerol tetraethers (GDGTs) are most abundant in the upper OMZ, where nitrate maxima point to ammonium oxidation but increase in relative abundance in the core OMZ and deep oxycline. The presence of non-phosphorus “substitute” lipids within the OMZ suggest that the indigenous microbes might be phosphorus limited (P starved) at ambient phosphate concentrations of 1 to 3.5 µM, although specific microbial sources for many of these lipids still remain unknown.

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Section: Factors Affecting Structural Diversity Of the Core Lipid Comsupporting

confidence: 45%

Section: Oxic Zonementioning

confidence: 99%

Intact polar lipids in the water column of the eastern tropical North Pacific: abundance and structural variety of non-phosphorus lipids

et al. 2018

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“…During the last decade(s), various unprecedented structures of ether lipids have been identified in various recent and ancient ecosystems, suggesting a specific physiological role of these molecules in living cells and their potential usefulness as organic proxies (lipid biomarkers). Nonisoprenoidal MGM and DGD have been detected in hydrothermal environments (26)(27)(28)(29) but are also omnipresent in many contemporary and ancient nonextreme marine ecosystems (30)(31)(32)(33). MGM and DGD present at methane cold seeps have been systematically attributed to the sulfate-reducing bacteria (SRB) partners of Archaea involved in the anaerobic oxidation of methane (30,(34)(35)(36)(37).…”

mentioning

confidence: 99%

Mono- and Dialkyl Glycerol Ether Lipids in Anaerobic Bacteria: Biosynthetic Insights from the Mesophilic Sulfate Reducer Desulfatibacillum alkenivorans PF2803 ^T

Grossi

Mollex

Vinçon‐Laugier

et al. 2015

Appl Environ Microbiol

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bBacterial glycerol ether lipids (alkylglycerols) have received increasing attention during the last decades, notably due to their potential role in cell resistance or adaptation to adverse environmental conditions. Major uncertainties remain, however, regarding the origin, biosynthesis, and modes of formation of these uncommon bacterial lipids. We report here the preponderance of monoalkyl-and dialkylglycerols (1-O-alkyl-, 2-O-alkyl-, and 1,2-O-dialkylglycerols) among the hydrolyzed lipids of the marine mesophilic sulfate-reducing proteobacterium Desulfatibacillum alkenivorans PF2803 T grown on n-alkenes (pentadec-1-ene or hexadec-1-ene) as the sole carbon and energy source. Alkylglycerols account for one-third to two-thirds of the total cellular lipids (alkylglycerols plus acylglycerols), depending on the growth substrate, with dialkylglycerols contributing to one-fifth to two-fifths of the total ether lipids. The carbon chain distribution of the lipids of D. alkenivorans also depends on that of the substrate, but the chain length and methyl-branching patterns of fatty acids and monoalkyl-and dialkylglycerols are systematically congruent, supporting the idea of a biosynthetic link between the three classes of compounds. Vinyl ethers (1-alken-1=-yl-glycerols, known as plasmalogens) are not detected among the lipids of strain PF2803 T . Cultures grown on different (per)deuterated n-alkene, n-alkanol, and n-fatty acid substrates further demonstrate that saturated alkylglycerols are not formed via the reduction of hypothetic alken-1=-yl intermediates. Our results support an unprecedented biosynthetic pathway to monoalkyl/monoacyl-and dialkylglycerols in anaerobic bacteria and suggest that n-alkyl compounds present in the environment can serve as the substrates for supplying the building blocks of ether phospholipids of heterotrophic bacteria.

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“…8f). Nonisoprenoid DAGEs have been detected in hydrothermal environments Jahnke et al, 2001;Pancost et al, 2005Pancost et al, , 2006Bradley et al, 2009;Kaur et al, 2011;Hamilton-Brehm et al, 2013), upper Pliocene iron sulphide nodules (van Dongen et al, 2007), and diverse marine sediments (Hinrichs et al, 2000;Pancost et al, 2001;Blumenberg et al, 2004;Arning et al, 2008;Hernandez-Sanchez et al, 2014). Here, given that the peak concentration of DAGEs corresponded to the presence of sulphate-reducing bacteria, we suggest that these are the source, as has been inferred in settings dominated by anaerobic oxidation of methane (Hinrichs et al, 2000;Pancost et al, 2001;Blumenberg et al, 2004), and consistent with their recent identification in a mesophilic strain of Deltaproteobacteria (Grossi et al, 2015, Vinçon-Laugier et al, 2016.…”

Section: Dagesmentioning

confidence: 99%

Biogeochemistry of intertidal microbial mats from Qatar: New insights from organic matter characterisation

Słowakiewicz

Whitaker

Thomas

et al. 2016

Organic Geochemistry

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms AbstractUnderstanding early organic matter alteration and preservation in marine carbonate-evaporite systems could improve understanding of carbon cycling and hydrocarbon source rock prediction in such environments. It is possible that organic-rich microbial mats are important contributors to preserved hydrocarbons, and to explore this we examined changes in lipid composition in such a mat from a mesohaline intertidal lagoon, eastern Qatar. The mat reaches > 5 cm thickness over a carbonate mud substrate, rich in seagrass, gastropods and other small bioclasts. Clear lamination, with distinct downward colour changes from green to pink to brown, reflects different microbial mat communities. The layers contain spheroids of probable dolomite, the precipitation of which was plausibly bacterially-mediated. Lipids [n-alkanes, fatty acids (FAs), hopanoids, isoprenoid hydrocarbons, dialkyl glycerol diethers (DAGEs), and isoprenoid (0 to 4) and branched (Ia to IIIa) GDGTs] reflect the diverse mat-building phototrophic, heterotrophic and chemoorganotrophic microorganisms, as well as some likely allochthonous material (i.e. steroids, n-alkanols, high molecular weight nalkanes). The lipids clearly document the change in microbial community, with phytene being the predominant hydrocarbon in the phototrophic surface layer. Oxygen and pH drop significantly 0.2 cm below the mat surface, coincident with the predominance of Deltaproteobacteria and increased concentrations of archaeal and bacterial glycerol dialkyl glycerol tetraether lipids andC 15 /C 16 and C 16 /C 17 dialkyl glycerol ether lipids in the deeper layers. Archaeol, likely of methanogen origin, is most abundant in the deepest layer. Allochthonous inputs occur throughout the mat, including abundant steroids, especially dinosterol and dinostanol, that are possibly related to periodic algal (dinoflagellate) blooms in the Arabian Gulf. Both n-alkanes and n-alkanols appear to be derived from seagrass. Organic matter contents decrease in the deepest mat; this suggests an overall low preservation potential of OM in intertidal mesohaline-hypersaline mats of the Arabian Gulf, which in turn suggests that these are not the major source of hydrocarbons in microbially-dominated carbonateevaporite systems.2

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Occurrence of 1-O-monoalkyl glycerol ether lipids in ocean waters and sediments

Cited by 31 publications

References 75 publications

Intact polar lipids in the water column of the eastern tropical North Pacific: abundance and structural variety of non-phosphorus lipids

Intact polar lipids in the water column of the eastern tropical North Pacific: abundance and structural variety of non-phosphorus lipids

Mono- and Dialkyl Glycerol Ether Lipids in Anaerobic Bacteria: Biosynthetic Insights from the Mesophilic Sulfate Reducer Desulfatibacillum alkenivorans PF2803 ^T

Biogeochemistry of intertidal microbial mats from Qatar: New insights from organic matter characterisation

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Occurrence of 1-O-monoalkyl glycerol ether lipids in ocean waters and sediments

Cited by 31 publications

References 75 publications

Intact polar lipids in the water column of the eastern tropical North Pacific: abundance and structural variety of non-phosphorus lipids

Intact polar lipids in the water column of the eastern tropical North Pacific: abundance and structural variety of non-phosphorus lipids

Mono- and Dialkyl Glycerol Ether Lipids in Anaerobic Bacteria: Biosynthetic Insights from the Mesophilic Sulfate Reducer Desulfatibacillum alkenivorans PF2803 T

Biogeochemistry of intertidal microbial mats from Qatar: New insights from organic matter characterisation

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Mono- and Dialkyl Glycerol Ether Lipids in Anaerobic Bacteria: Biosynthetic Insights from the Mesophilic Sulfate Reducer Desulfatibacillum alkenivorans PF2803 ^T