Tellurite Adsorption onto Bacterial Surfaces

被引：13

作者：

Goff, Jennifer L. ^{[1
]}

Wang, Yuwei ^{[2
]}

Boyanov, Maxim, I ^{[3
,4
]}

Yu, Qiang ^{[5
]}

Kemner, Kenneth M. ^{[4
]}

Fein, Jeremy B. ^{[5
]}

Yee, Nathan ^{[1
,2
]}

机构：

[1] Rutgers State Univ, Dept Earth & Planetary Sci, Piscataway, NJ 08854 USA

[2] Rutgers State Univ, Dept Environm Sci, New Brunswick, NJ 08901 USA

[3] Bulgarian Acad Sci, Inst Chem Engn, Sofia 1113, Bulgaria

[4] Argonne Natl Lab, Biosci Div, Argonne, IL 60439 USA

[5] Univ Notre Dame, Dept Civil & Environm Engn & Earth Sci, Notre Dame, IN 46556 USA

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2021年 / 55卷 / 15期

基金：

美国国家科学基金会;

关键词：

tellurium; metalloid; extracellular polymeric substances; CdTe; photovoltaic; sulfhydryl; toxicity; X-ray adsorption spectroscopy; SULFHYDRYL BINDING-SITES; CRYSTAL-STRUCTURE; ESCHERICHIA-COLI; SELENIUM; CADMIUM; GLUTATHIONE; RESISTANCE; CDTE; COORDINATION; INHIBITION;

D O I：

10.1021/acs.est.1c01001

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Tellurium (Te) is an emerging contaminant and its chemical transformation in the environment is strongly influenced by microbial processes. In this study, we investigated the adsorption of tellurite [Te(IV), TeO32-] onto the common soil bacterium Bacillus subtilis. Thiol-blocking experiments were carried out to investigate the role of cell surface sulfhydryl sites in tellurite binding, and extended X-ray absorption fine structure (EXAFS) spectroscopy was performed to determine the chemical speciation of the adsorbed tellurite. The results indicate that tellurite reacts with sulfhydryl functional groups in the extracellular polymeric substances (EPS) produced by B. subtilis. Upon binding to sulfhydryl sites in the EPS, the Te changes from Te-O bonds to Te-S coordination. Further analysis of the surface-associated molecules shows that the EPS of B. subtilis contain proteins. Removal of the proteinaceous EPS dramatically decreases tellurite adsorption and the sulfhydryl surface site concentration. These findings indicate that sulfhydryl binding in EPS plays a key role in tellurite adsorption on bacterial surfaces.

引用

页码：10378 / 10386

页数：9

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