Dihydroxyacetone metabolism in Salinibacter ruber and in Haloquadratum walsbyi
Dihydroxyacetone metabolism in Salinibacter ruber and in Haloquadratum walsbyi
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DOI：
10.1007/s00792-007-0114-x
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发表时间：
2008-01-01
期刊：
影响因子：
2.9
通讯作者：
Oren, Aharon
中科院分区：
文献类型：
--
作者：
Bardavid, Rahel Elevi;Oren, Aharon
极端嗜盐细菌Salinibacter ruber与方形古菌Haloquadratum walsbyi一起生活在世界各地的盐场结晶池中。盐杆菌属的培养物已被证明可将高达20%的甘油转化为先前未表征的溢流产物。我们在此将盐杆菌不完全氧化甘油的产物鉴定为二羟基丙酮。基因组信息表明H. walsbyi拥有一个有效的吸收系统，二羟丙酮，我们在这里表明，二羟丙酮确实是代谢的Haloquadratum文化，以及由异养原核生物群落的盐场结晶池在埃拉特，以色列，占主导地位的Haloquadratum样细胞。在没有甘油的情况下，盐杆菌也摄取二羟基丙酮。在高盐度湖泊中，由绿色盐藻作为渗透溶质产生的甘油的降解可能因此涉及作为中间体的二羟基丙酮，然后可以被环境中存在的不同类型的异养生物所吸收。
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.