Sb(III) resistance mechanism and oxidation characteristics of Klebsiella aerogenes X. (April 2022)

• Record Type: Journal Article
• Authors: Rong, Qun; Ling, Caiyuan; Lu, Dingtian; Zhang, Chaolan; Zhao, Hecheng; Zhong, Kai; Nong, Xinyu; Qin, Xingzi
• Is Part Of: Chemosphere. Volume 293(2022)
• Publication Date: 2022-04
• Subjects: Klebsiella aerogenes -- Sb(III)-Oxidizing bacteria -- Antioxidant enzymes -- Extracellular metabolic oxidation -- Electron shuttles; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2021.133453
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Resistant bacteria are potential natural materials for the bioremediation of soil metalloid pollution. A strain isolated from farmland soil chronically exposed to Sb was identified as K. aerogenes X with high antimonite [Sb(III)] tolerance and oxidation ability. The resistance mechanism of K. aerogenes X and its extracellular polymeric substances (EPS), antioxidant enzymes, and oxidation characteristics in Sb(III) stress were investigated in this study by stress incubation experiments and FTIR. The biotoxicity of Sb was limited by the binding of the organic compounds in EPS, and the anionic functional groups (e.g., amino, carboxyl and hydroxyl groups, etc.) present in the cell envelope were the components primarily responsible for the metalloid-binding capability of K. aerogenes X. The K. aerogenes X can oxidize Sb(III), and its metabolites induce changes in reactive oxygen species (ROS), catalase (CAT), total superoxide dismutase (SOD) and glutathione s-transferase (GSH-S) activity, indicating that the resistance mechanisms of K. aerogenes X are mediated by oxidative stress, EPS restriction and cell damage. Oxidation of Sb(III) is driven by interactions in intracellular oxidation, cell electron transport, extracellular metabolism including proteins and low molecular weight components (LMWs). LMWs (molecular weight <3 kDa) are the main driving factor of Sb(III) oxidation. In addition, Sb resistance genes arsA, arsB, arsC, arsD and acr3 and potential oxidation gene arsH were identified in K. aerogenes X. Owing to its natural origin, high tolerance and oxidation ability, K. aerogenes X could serve as a potential bioremediation material for the mitigation of Sb(III) in contaminated areas. Graphical abstract: Image 1 Highlights: Klebsiella aerogenes X was presented resistance and oxidation to Sb(III). Sb(III) toxicity reduced by EPS sorption, oxidization and antioxidant enzymes. Sb(III) oxidation was driven by extracellular metabolites, cells, and cytoplasm. Oxidants mainly distributed in low molecular weight components.