title: Intact membrane lipids of "Candidatus Nitrosopumilus maritimus," a cultivated representative of the cosmopolitan mesophilic group I Crenarchaeota.
abstract: In this study we analyzed the membrane lipid composition of "Candidatus Nitrosopumilus maritimus," the only cultivated representative of the cosmopolitan group I crenarchaeota and the only mesophilic isolate of the phylum Crenarchaeota. The core lipids of "Ca. Nitrosopumilus maritimus" consisted of glycerol dialkyl glycerol tetraethers (GDGTs) with zero to four cyclopentyl moieties. Crenarchaeol, a unique GDGT containing a cyclohexyl moiety in addition to four cyclopentyl moieties, was the most abundant GDGT. This confirms unambiguously that crenarchaeol is synthesized by species belonging to the group I.1a crenarchaeota. Intact polar lipid analysis revealed that the GDGTs have hexose, dihexose, and/or phosphohexose head groups. Similar polar lipids were previously found in deeply buried sediments from the Peru margin, suggesting that they were in part synthesized by group I crenarchaeota.
authors.affiliation: Royal Netherlands Institute for Sea Research, Department of Marine Organic Biogeochemistry, P.O. Box 59, 1790 AB Den Burg, Texel, The Netherlands. schouten@nioz.nl
authors.forename: Stefan
authors.initials: S
authors.lastname: Schouten
authors.forename: Ellen C
authors.initials: EC
authors.lastname: Hopmans
authors.forename: Marianne
authors.initials: M
authors.lastname: Baas
authors.forename: Henry
authors.initials: H
authors.lastname: Boumann
authors.forename: Sonja
authors.initials: S
authors.lastname: Standfest
authors.forename: Martin
authors.initials: M
authors.lastname: Könneke
authors.forename: David A
authors.initials: DA
authors.lastname: Stahl
authors.forename: Jaap S
authors.initials: JS
authors.lastname: Sinninghe Damsté
mesh_terms: D002851:Chromatography, High Pressure Liquid; D019615:Crenarchaeota / Q000737:chemistry*; D005995:Glyceryl Ethers / Q000302:isolation & purification*; D013058:Mass Spectrometry; D008563:Membrane Lipids / Q000032:analysis*; D010743:Phospholipids / Q000032:analysis
chemical_list: D005995:Glyceryl Ethers; D008563:Membrane Lipids; D010743:Phospholipids; C493345:crenarchaeol