Hopanoids in marine cyanobacteria: probing their phylogenetic distribution and biological role

Geobiology
James Peter SáenzRoger E Summons

Abstract

Cyanobacteria are key players in the global carbon and nitrogen cycles and are thought to have been responsible for the initial rise of atmospheric oxygen during the Neoarchean. There is evidence that a class of membrane lipids known as hopanoids serve as biomarkers for bacteria, including many cyanobacteria, in the environment and in the geologic record. However, the taxonomic distributions and physiological roles of hopanoids in marine cyanobacteria remain unclear. We examined the distribution of bacteriohopanepolyols (BHPs) in a collection of marine cyanobacterial enrichment and pure cultures and investigated the relationship between the cellular abundance of BHPs and nitrogen limitation in Crocosphaera watsonii, a globally significant nitrogen-fixing cyanobacterium. In pure culture, BHPs were only detected in species capable of nitrogen fixation, implicating hopanoids as potential markers for diazotrophy in the oceans. The enrichment cultures we examined exhibited a higher degree of BHP diversity, demonstrating that there are presently unaccounted for marine bacteria, possibly cyanobacteria, associated with the production of a range of BHP structures. Crocosphaera watsonii exhibited high membrane hopanoid content consistent...Continue Reading

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Citations

May 16, 2012·Canadian Journal of Microbiology·Rajesh P RastogiRajeshwar P Sinha
Apr 23, 2010·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Tomoki YabutaniJunko Motonaka
Apr 12, 2015·FEMS Microbiology Reviews·Christian Sohlenkamp, Otto Geiger
Jun 7, 2014·Journal of Biotechnology·Hiroshi KiyotaMasahiko Ikeuchi
Apr 19, 2018·FEMS Microbiology Ecology·Jenan J KharbushLihini I Aluwihare
Apr 30, 2017·Applied and Environmental Microbiology·Tamsyn J GarbyBrett A Neilan
Aug 28, 2019·Proceedings of the National Academy of Sciences of the United States of America·Francisco M Cornejo-Castillo, Jonathan P Zehr
Dec 16, 2020·Proceedings of the National Academy of Sciences of the United States of America·Felix J EllingAnn Pearson
May 15, 2021·Environmental Microbiology·Elise M TookmanianDianne K Newman

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