Novel Strategy for Improvement of the Bioleaching Efficiency of Acidithiobacillus ferrooxidans Based on the AfeI/R Quorum Sensing System

被引：31
作者：
Gao, Xue-Yan [1 ]
Liu, Xiu-Jie [1 ]
Fu, Chang-Ai [1 ]
Gu, Xiu-Feng [1 ]
Lin, Jian-Qiang [1 ]
Liu, Xiang-Mei [1 ]
Pang, Xin [1 ]
Lin, Jian-Qun [1 ]
Chen, Lin-Xu [1 ]
机构：
[1] Shandong Univ, State Key Lab Microbial Technol, 72 Binhai Rd, Qingdao 266237, Peoples R China
来源：
MINERALS | 2020年 / 10卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Acidithiobacillus ferrooxidans; EPS synthesis; biofilm formation; bacteria-ore interactions; quorum sensing; THIOBACILLUS-FERROOXIDANS; BIOFILM FORMATION; LELOIR PATHWAY; SULFUR; BACTERIA; SOLUBILIZATION; COMMUNICATION; THIOSULFATE; MECHANISM; SURFACES;
D O I：
10.3390/min10030222
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
Acidithiobacillus ferrooxidans is an acidophilic and chemolithotrophic sulfur- and iron-oxidizing bacterium that has been widely used in the bioleaching process for extracting metals. Extracellular polymeric substances (EPS) are essential for bacteria-ore interactions, and the regulation of EPS synthesis could be an important way of influencing the efficiency of the bioleaching process. Therefore, exploring and utilizing the regulatory pathways of EPS synthesis to improve the bacterial bioleaching capability have posed a challenge in the study and application of bioleaching bacteria. Here, several engineering strains were constructed using genetic manipulation methods. And we revealed the regulatory function of the AfeI/R quorum sensing (QS) system in EPS synthesis and biofilm formation of A. ferrooxidans, and the AfeI/R-mediated EPS synthesis could influence bacteria-substrate interactions and the efficiency of bioleaching. Finally, an AfeI/R-mediated bioleaching model was proposed to illustrate the role of QS system in this process. This study provided new insights into and clues for developing highly efficient bioleaching bacteria and modulating the bioleaching process.
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页数：16
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