Abstract
Hopanoid lipids have been discovered recently in a number of nitrogen-fixing soil bacteria and in Bradyrhizobium bacteria which fix nitrogen in association with legume plants. We report here an investigation of the hopanoid content in an additional number of soil bacteria capable of living in close association with plants. Of the strains investigated, hopanoids were discovered in phototrophic, nitrogen-fixing bacteria and in an extended number of Bradyrhizobium strains. Strains in which hopanoids so far have not been found belong to the following genera: Rhizobium, Sinorhizobium, Phyllobacterium, Agrobacterium, and Azoarcus. To address the function of hopanoids in Bradyrhizobium, we cloned the gene coding for a key enzyme of hopanoid biosynthesis, the squalene-hopene cyclase, and expressed the gene in E. coll The recombinant enzyme catalyzed in vitro the cyclization of squalene to hopanoid derivatives.
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Abbreviations
- SHC:
-
squalene-hopene cyclase
- shc :
-
squalene-hopene cyclase gene
References
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© 1996 Springer Science+Business Media Dordrecht
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Kannenberg, E.L., Perzl, M., Müller, P., Härtner, T., Poralla, K. (1996). Hopanoid lipids in Bradyrhizobium and other plant-associated bacteria and cloning of the Bradyrhizobium japonicum squalene-hopene cyclase gene. In: Elkan, G.H., Upchurch, R.G. (eds) Current Issues in Symbiotic Nitrogen Fixation. Developments in Plant and Soil Sciences, vol 72. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5700-1_15
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DOI: https://doi.org/10.1007/978-94-011-5700-1_15
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