Lipid composition and nitrogenase activity of symbioticFrankia (Alnus incana) in response to different oxygen concentrations

Kleemann, Gisela; Alskog, Gunnar; Berry, Alison M.; Huss‐Danell, Kerstin

doi:10.1007/bf01276818

Cited by 31 publications

(25 citation statements)

References 27 publications

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“…and Bradyrhizobium japonicum. 20,21 Hopanoids are usually present in concentrations of the same order of magnitude as those found for sterols in eukaryotic cells. 15 Such concentrations are in most cases at least one order of magnitude higher than those of the ubiquitous bacterial isoprenoids such as the ubiquinones 12 and the menaquinones 13 or of the bactoprenol, and even higher than those of most bacterial carotenoids.…”

Section: The Origin Of the Discovery: The Biosynthesis Of Bacterial Hmentioning

confidence: 99%

The discovery of a mevalonate-independent pathway for isoprenoid biosynthesis in bacteria, algae and higher plants†

1999

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Section: The Origin Of the Discovery: The Biosynthesis Of Bacterial Hmentioning

confidence: 99%

The discovery of a mevalonate-independent pathway for isoprenoid biosynthesis in bacteria, algae and higher plants†

1999

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“…3). Up to 90% of these vesicle envelopes consist of BHT and a phenylacetyl monoester of BHT (phenylacetic acid (PAA)-BHT), at an estimated PAA-BHT:BHT ratio between 30:70 and 50:50 (REFS 51,105). Purified PAA-BHT and BHT seem to optimally stabilize membranes at those relative abundances in vitro, and so this mixture of PAA-BHT and BHT may promote vesicle stability 66 .…”

Section: Biological Functions Of Hopanoidsmentioning

confidence: 99%

Hopanoid lipids: from membranes to plant–bacteria interactions

et al. 2018

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Lipid research represents a frontier for microbiology, as showcased by hopanoid lipids. Hopanoids, which resemble sterols and are found in the membranes of diverse bacteria, have left an extensive molecular fossil record. They were first discovered by petroleum geologists. Today, hopanoid-producing bacteria remain abundant in various ecosystems, such as the rhizosphere. Recently, great progress has been made in our understanding of hopanoid biosynthesis, facilitated in part by technical advances in lipid identification and quantification. A variety of genetically tractable, hopanoid-producing bacteria have been cultured, and tools to manipulate hopanoid biosynthesis and detect hopanoids are improving. However, we still have much to learn regarding how hopanoid production is regulated, how hopanoids act biophysically and biochemically, and how their production affects bacterial interactions with other organisms, such as plants. The study of hopanoids thus offers rich opportunities for discovery.

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“…Hopanoids have been implicated in regulating membrane permeability in several cultured bacteria. (Berry et al, 1993;Kleemann et al, 1994). Streptomyces coelicolor only produce hopanoids when they are grown aerially, and it has been suggested that hopanoids play a role in preventing loss of water and cell desiccation (Poralla et al, 2000), although a mutant of Streptomyces scabies lacking the ability to synthesize hopanoids was viable and showed no identifiable phenotype (Seipke & Loria, 2009).…”

Section: Ecology and Physiology Of Hopanoids In Marine Cyanobacteriamentioning

confidence: 99%

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

et al. 2012

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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 with the idea that hopanoids have an important effect on the bulk physical properties of the membrane. However, the abundance of BHPs in C. watsonii did not vary considerably when grown under nitrogen-limiting and nitrogen-replete conditions, suggesting that the role of hopanoids in this organism is not directly related to the physiology of nitrogen fixation. Alternatively, we propose that high hopanoid content in C. watsonii may serve to reduce membrane permeability to antimicrobial toxins in the environment.

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Lipid composition and nitrogenase activity of symbioticFrankia (Alnus incana) in response to different oxygen concentrations

Cited by 31 publications

References 27 publications

The discovery of a mevalonate-independent pathway for isoprenoid biosynthesis in bacteria, algae and higher plants†

The discovery of a mevalonate-independent pathway for isoprenoid biosynthesis in bacteria, algae and higher plants†

Hopanoid lipids: from membranes to plant–bacteria interactions

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

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