Bacteriohopanepolyols in a stratified cyanobacterial mat from Kiritimati (Christmas Island,Kiribati) |
| |
| Institution: | 1. Geoscience Center, Geobiology Group, Georg-August-University Göttingen, Goldschmidtstr. 3, 37077 Göttingen, Germany;2. Courant Center Geobiology, Georg-August-University Göttingen, Goldschmidtstr. 3, 37077 Göttingen, Germany;3. Department of Genomic and Applied Microbiology & Göttingen Genomics Laboratory, Institute of Microbiology and Genetics, Georg-August-University Göttingen, Grisebachstr. 8, 37077 Göttingen, Germany;1. Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique (LESIA), Observatoire de Paris, CNRS, UPMC, Paris Diderot Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon, France;2. Space Exploration Sector, Johns Hopkins University Applied Physics Lab, Laurel, MD 20723, USA;3. Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS-IPSL), Université Versailles St-Quentin (UVSQ), 11 bd d’Alembert, 78 280 Guyancourt, France;1. University of Antwerp, Dept. of Biology, 2610 Wilrijk, Belgium;2. The Agricultural University of Iceland, Fac. of Agricultural and Environmental Sciences, 311 Borgarnes, Iceland;3. Global Ecology Unit CREAF-CSIC-UAB, CSIC, Bellaterra (Catalonia) E-08193, Spain;4. Vrije Universiteit Amsterdam, Dept. of Ecological Science, 1081 HV Amsterdam, the Netherlands;5. Utrecht University, Dept. of Earth Sciences, 3584 CD Utrecht, the Netherlands;1. School of Earth Science and Technology, Hebei University of Engineering, Handan 056038, China;2. Department of Applied Geosciences & Geophysics, Montanuniversität, Leoben, Austria;3. Key Laboratory of Resource Exploration Research of Hebei Province, Hebei University of Engineering, Handan 056038, China;1. NIOZ, Royal Netherlands Institute for Sea Research, Department of Marine Microbiology and Biogeochemistry (MMB), and Utrecht University, PO Box 59, 1790 AB Den Burg, The Netherlands;2. Utrecht University, Faculty of Geosciences, Department of Earth Sciences, Budapestlaan 4, 3584 CD Utrecht, The Netherlands;1. Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Vening Meinesz Building A, 3584 Utrecht, the Netherlands;2. Department of Physical Geography, Faculty of Geosciences, Utrecht University, Vening Meinesz Building A, 3584 Utrecht, the Netherlands;3. Department of Marine Microbiology and Biogeochemistry, and Utrecht University, NIOZ Royal Netherlands Institute for Sea Research, 17900 AB Den Burg, Texel, the Netherlands |
| |
| Abstract: | Bacteriohopanepolyols (BHPs) are lipids of distinct bacterial groups and are, along with geohopanoids as their diagenetic products, ubiquitous in microbial mats, sediments, soils and oil. Among BHP-producing bacteria, Cyanobacteria are of special interest since occurrences of C-2 methylated and other geohopanoids are interpreted as signals of oxygenic photoautotrophs in the early oceans. However, many questions, with respect to the source and function of hopanoids, remain open. Cyanobacterial mats are complex systems in terms of biogeochemical zones and hence, harbor phylogenetically and metabolically diverse photoautotrophic and heterotrophic microorganisms. Whereas Cyanobacteria are key microbial players for carbon fixation in these mat systems, most other bacterial and archaeal groups feed on their metabolic products and/or perform anoxygenic photosynthesis in deeper low-light regimes.We have analyzed the abundance and distribution of BHPs in distinct layers of a stratified mat from a hypersaline lake on Kiritimati. Suites of BHPs were observed, with the majority probably originating from (proteo-)bacteria thriving in the deeper layers of the mat and not in upper layers where mat-forming Cyanobacteria are prevalent. Interestingly, the BHPs in the deepest layer include C-2 methylated structures, which likely do not originate from Cyanobacteria, but rather from α-Proteobacteria thriving at the redoxcline of this stratified microbial system. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
