Extremophiles

, Volume 15, Issue 1, pp 59–65 | Cite as

Temperature and pH controls on glycerol dibiphytanyl glycerol tetraether lipid composition in the hyperthermophilic crenarchaeon Acidilobus sulfurireducens

  • Eric S. Boyd
  • Ann Pearson
  • Yundan Pi
  • Wen-Jun Li
  • Yi Ge Zhang
  • Liu He
  • Chuanlun L. Zhang
  • Gill G. Geesey
Original Paper

Abstract

Cyclization in glycerol dibiphytanyl glycerol tetraethers (GDGTs) results in internal cyclopentane moieties which are believed to confer thermal stability to crenarchaeal membranes. While the average number of rings per GDGT lipid (ring index) is positively correlated with temperature in many temperate environments, poor correlations are often observed in geothermal environments, suggesting that additional parameters may influence GDGT core lipid composition in these systems. However, the physical and chemical parameters likely to influence GDGT cyclization which are often difficult to decouple in geothermal systems, making it challenging to assess their influence on lipid composition. In the present study, the influence of temperature (range 65–81°C), pH (range 3.0–5.0), and ionic strength (range 10.1–55.7 mM) on GDGT core lipid composition was examined in the hyperthermoacidophile Acidilobus sulfurireducens, a crenarchaeon originally isolated from a geothermal spring in Yellowstone National Park, Wyoming. When cultivated under defined laboratory conditions, the composition of individual and total GDGTs varied significantly with temperature and to a lesser extent with the pH of the growth medium. Ionic strength over the range of values tested did not influence GDGT composition. The GDGT core lipid ring index was positively correlated with temperature and negatively correlated with pH, suggesting that A. sulfurireducens responds to increasing temperature and acidity by increasing the number of cyclopentyl rings in GDGT core membrane lipids.

Keywords

Glycerol dibiphytanyl glycerol tetraether GDGT Yellowstone pH Temperature Crenarchaea 

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Copyright information

© Springer 2010

Authors and Affiliations

  • Eric S. Boyd
    • 1
  • Ann Pearson
    • 2
  • Yundan Pi
    • 2
  • Wen-Jun Li
    • 3
  • Yi Ge Zhang
    • 4
  • Liu He
    • 5
  • Chuanlun L. Zhang
    • 5
    • 6
  • Gill G. Geesey
    • 1
  1. 1.Department of MicrobiologyMontana State UniversityBozemanUSA
  2. 2.Department of Earth and Planetary SciencesHarvard UniversityCambridgeUSA
  3. 3.Yunnan Institute of MicrobiologyYunnan UniversityKunmingChina
  4. 4.Department of Geology and GeophysicsYale UniversityNew HavenUSA
  5. 5.State Key Laboratory of Marine GeologyTongji UniversityShanghaiChina
  6. 6.Department of Marine SciencesUniversity of GeorgiaAthensUSA

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