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首页> 外文期刊>Journal of industrial microbiology & biotechnology >Underlying mechanisms of ANAMMOX bacteria adaptation to salinity stress
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Underlying mechanisms of ANAMMOX bacteria adaptation to salinity stress

机译：厌氧菌细菌适应盐度应力的潜在机制

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摘要

Dealing with nitrogen-rich saline wastewater produced by industries remains challenging because of the inhibition of functional microorganisms by high salinity. The underlying mechanisms of anaerobic ammonium-oxidizing bacteria (AnAOB) exposed to salinity stress should be studied to investigate the potential of anaerobic ammonium oxidation (ANAMMOX) for applications in such wastewater. In this study, the total DNA from granular sludge was extracted from an expanded granular sludge bed(EGSB) reactor operated at 0, 15 and 30g/L salinity and subjected to high-throughput sequencing. The nitrogen removal performance in the reactor could be maintained from 86.2 to 88.0% at less than 30g/L salinity level. The microbial diversity in the reactor under saline conditions was lower than that under the salt-free condition. Three genera of AnAOB were detected in the reactor, and Candidatus Kuenenia was the most abundant. The predictive functional profiling based on the Clusters of Orthologous Groups of proteins (COGs)database showed that the inhibition of AnAOB under saline conditions was mainly characterised by the weakening of energy metabolism and intracellular repair. AnAOB might adapt to salinity stress by increasing their rigidity and intracellular osmotic pressure. The predictive functional profiling based on the Kyoto Encyclopedia of Genes and Genomes(KEGG) pathway database revealed that the inhibition of AnAOB was mainly manifested by the weakening of intracellular carbohydrate and lipid metabolism, the blockage of intracellular energy supply and the reduction of membrane transport capacity. AnAOB might adapt to salinity stress by strengthening wall/membrane synthesis, essential cofactors (porphyrins) and energy productivity, enhancing intracellular material transformation and gene repair and changing its structure and group behaviour. The stability of the nitrogen removal performance could be maintained via the adaptation of AnAOB to salinity and their increased abundance.
机译：由于高盐度抑制功能微生物抑制，处理由行业生产的富含富含富含盐水废水仍然具有挑战性。应研究暴露于盐度应力的厌氧铵 - 氧化细菌（AnaOB）的潜在机制，以研究这种废水中厌氧氧化铵氧化（厌氧毒素）的潜力。在该研究中，从颗粒污泥的总DNA从膨胀颗粒污泥床（EGSB）反应器中萃取，在0,15和30g / L盐度下操作并进行高通量测序。反应器中的氮去除性能可在少于30g / L盐度水平下维持86.2至88.0％。在盐水条件下反应器中的微生物多样性低于无盐条件下的微生物分集。在反应器中检测到三个anaob，坎迪斯库尼尼亚是最丰富的。基于直晶蛋白（COGS）数据库簇的预测功能性分析表明，盐水条件下厌氧的抑制主要是能量代谢和细胞内修复的弱化。 AnaOB可以通过增加刚性和细胞内渗透压来适应盐度应力。基于基因和基因组（Kegg）途径（Kegg）数据库的预测功能性分析显示，AnaOB的抑制作用主要表现出细胞内碳水化合物和脂质代谢的弱化，细胞内能量供应的堵塞和膜运输能力的降低。 AnaOB可以通过强化壁/膜合成，必需的辅因子（卟啉）和能量生产率，增强细胞内材料转化和基因修复并改变其结构和组行为来适应盐度应力。氮去除性能的稳定性可以通过AnaOB对盐度的改编和它们增加的丰度来保持。

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