Dihydroxyacetone metabolism in <Emphasis Type="Italic">Salinibacter ruber</Emphasis> and in <Emphasis Type="Italic">Haloquadratum walsbyi</Emphasis> |
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Authors: | Rahel Elevi Bardavid Aharon Oren |
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Institution: | (1) The Institute of Life Sciences, and The Moshe Shilo Minerva Center for Marine Biogeochemistry, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel;(2) Department of Plant and Environmental Sciences, The Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel |
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Abstract: | The extremely halophilic bacterium Salinibacter ruber inhabits saltern crystallizer ponds worldwide, together with the square archaeon Haloquadratum walsbyi. Cultures of Salinibacter have been shown to convert up to 20% of the glycerol added to a not previously characterized overflow product. We here identify
this product of incomplete glycerol oxidation by Salinibacter as dihydroxyacetone. Genomic information suggests that H. walsbyi possesses an efficient uptake system for dihydroxyacetone, and we show here that dihydroxyacetone is indeed metabolized by
Haloquadratum cultures, as well as by the heterotrophic prokaryotic community of the saltern crystallizer ponds in Eilat, Israel, dominated
by Haloquadratum-like cells. In the absence of glycerol, Salinibacter also takes up dihydroxyacetone. Degradation of glycerol, produced in hypersaline lakes as an osmotic solute by the green
alga Dunaliella salina may thus involve dihydroxyacetone as an intermediate, which can then be taken up by different types of heterotrophs present
in the environment. |
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Keywords: | Salinibacter Haloquadratum Dihydroxyacetone Glycerol Incomplete oxidation |
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