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首页> 外文会议>International astronautical congress >OSMOADAPTATION STRATEGIES USED BY SALINIBACTER RUBER IN A EUROPAN SCENARIO
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OSMOADAPTATION STRATEGIES USED BY SALINIBACTER RUBER IN A EUROPAN SCENARIO

机译：SALINIBACTER RUBER在欧洲情景中使用的渗透适应策略

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The organisms thriving at higher salt concentrations than the average salt content on terrestrial oceans (0.6 M NaCl) are considered halophiles. They are a type of extremophile organisms. There is enough evidence to sustain the presence of salty waters on different planetary scenarios such as the ocean of the satellite Europa or the surface of the planet Mars. Due to the particular events that conducted to the formation of these extraterrestrial scenarios, their geology is different from the terrestrial one. Therefore, the chemical nature of the salty compounds proposed to exist in these scenarios is quite different to the most abundant salt in terrestrial oceans. Even when this is a well-recognized fact, a systematic study that helps to understand the stress imposed by salts different from NaCl is still missing. We are particularly interested in the adaptive strategies displayed by Salinibacter ruber, an extreme halophile, when exposed to media modified with different MgSO4 concentrations that can be interpreted as possible models for the salinity conditions of Europa's ocean. We determined the growth rate, and the duplication time of S. ruber when exposed to media exhibiting different water activities (aw) determined by the presence of distinct contents of NaCl, or MgSO4. An analysis of the protein profile helps to confirm the extreme halophilic character of S. ruber as different types of proteins are accumulated at low salt concentrations. We also determined, for the first time and by quantitative proton nuclear magnetic resonance, that S. ruber can use not only the salt-in strategy as an osmoprotectant mechanism, but also the salt-out strategy as the bacteria can incorporate compatible solutes as betaine, glutamate and coline when available in the modified media. Our results may help to gain a better understanding of the metabolic pathways used by this bacterial halophilc when exposed to representative conditions of an extraterrestrial ocean. And above all. they may help to explore the adaptation capabilities of extrcmophiles in scenarios of astrobiological importance.
机译：盐浓度比陆地海洋中的平均盐含量（0.6 M NaCl）高的盐会兴旺的生物被认为是嗜盐菌。它们是极端微生物的一种。有足够的证据来维持咸水在不同的行星情景中的存在，例如卫星欧罗巴的海洋或火星表面的咸水。由于形成这些外星场景的特殊事件，它们的地质状况与地球的地质情况不同。因此，建议在这些情况下存在的咸味化合物的化学性质与陆地海洋中最丰富的盐有很大不同。即使这是公认的事实，仍然缺少有助于理解由不同于NaCl的盐引起的压力的系统研究。当暴露于用不同MgSO4浓度修饰的培养基中时，极端嗜盐菌Salinibacter ruber展示的适应性策略尤其令人感兴趣，这可以解释为欧罗巴海洋盐度条件的可能模型。当暴露于表现出不同水活度（aw）的培养基时，我们确定了生长速率以及红宝石菌的复制时间，而这取决于NaCl或MgSO4含量的不同。对蛋白质谱的分析有助于确认红宝石酵母的极端嗜盐特性，因为不同类型的蛋白质在低盐浓度下会积聚。我们还首次通过定量的质子核磁共振确定，S。ruber不仅可以将盐引入策略用作渗透保护机制，而且还可以将盐析策略用作细菌可以掺入相容性溶质如甜菜碱的方法。 ，谷氨酸和脯氨酸（可在改良培养基中使用）。当暴露于地外海洋的代表性条件时，我们的结果可能有助于更好地了解这种细菌嗜盐菌所使用的代谢途径。最重要的是。它们可能有助于探索嗜热微生物在天体生物学重要场景下的适应能力。

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