Journal article
Molecular characterization of core lipids from halophilic archaea grown under different salinity conditions
Organic geochemistry, v 48, pp 1-8
01 Jul 2012
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Halorhabdus utahensis, Natronomonas pharaonis, Haloferax sulfurifontis and Halobaculum gomorrense were grown at salinity values between 10% and 30% NaCl (w/v). The strains represent four haloarchaeal genera and have a range of salinity optima. Analysis of core membrane lipids of each strain using gas chromatography-mass spectrometry (GC-MS) revealed structures consistent with saturated, unsaturated and polyunsaturated dialkyl glycerol diethers (DGDs) including both phytanyl (C-20) and sesterpanyl (C-25) isoprenoid chains. In addition, we observed three trends related to salinity: (i) the proportion of unsaturated DGDs increased with increasing NaCl concentration in the medium, (ii) strains with a higher optimal NaCl concentration had a higher proportion of unsaturated DGDs and (iii) C25-20 DGDs occurred in the two strains with higher salinity optima, N. pharaonis and H. utahensis. The strong linear correlation between optimal growth salinity and fraction of unsaturated DGDs suggests that membrane lipid unsaturation is an important adaptation to specific salinity niches in archaeal halophiles. In addition, in three of the four strains, the fraction of unsaturated DGDs increased above a salinity threshold or in response to increasing salinity in the medium. Thus, halophilic archaea regulate membrane lipid unsaturation in response to environmental salinity change, regardless of their salinity optima. (C) 2012 Elsevier Ltd. All rights reserved.
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Details
- Title
- Molecular characterization of core lipids from halophilic archaea grown under different salinity conditions
- Creators
- Katherine S. Dawson (Corresponding Author) - Pennsylvania State UniversityKatherine H. Freeman - Pennsylvania State UniversityJennifer L. Macalady - Pennsylvania State University
- Publication Details
- Organic geochemistry, v 48, pp 1-8
- Publisher
- Elsevier
- Number of pages
- 8
- Grant note
- Pennsylvania State University Biogeochemistry Program fellowship; Pennsylvania State University NNA04C-C06A / Penn State Astrobiology Research Center (PSARC), NASA NAI
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Environmental Biogeochemistry
- Web of Science ID
- WOS:000305811100001
- Scopus ID
- 2-s2.0-84860832675
- Other Identifier
- 991022207046004721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Geochemistry & Geophysics