<i>Enterococcus faecalis</i>strain LZ-11 isolated from Lanzhou reach of the Yellow River is able to resist and absorb Cadmium

Wu, Gaofeng; Sun, Mingming; Liu, Pu; Zhang, X.; Yu, Zhengsheng; Zheng, Zhe; Chen, Youxing; Li, X.

doi:10.1111/jam.12460

Cited by 15 publications

(5 citation statements)

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“…These results are similar to the findings by Khan [23]. SEM results revealed that P. shigelloides H5 adapts to high concentrations of cadmium ions in the environment by increasing the volume, which is similar to findings by Wu and Sun [22]. EDX results indicate that the outer membrane of P. shigelloides H5 was involved in the adsorption of heavy metals, as Kim reported [31].…”

Section: Discussionsupporting

confidence: 90%

“…EDX results indicate that the outer membrane of P. shigelloides H5 was involved in the adsorption of heavy metals, as Kim reported [31]. One previous study found that bacteria can transport metal ions into the cells by passive transport or by an outmembrane's Mn 2+ /Zn 2+ /Ca 2+ transporter [22]. The intracellular Cd 2+ can combine with phosphate to perform precipitate, or Cd 2+ toxicity can cause a cadmium efflux pump CzcCBA to efflux Cd 2+ in order to reduce damage [23].…”

Section: Discussionmentioning

confidence: 55%

“…Many indigenous species of microorganisms have the capacity to tolerate heavy metals, for example, Enterococcus faecalis, Escherichia coli, Bosea sp., and Bacillus catenulatus [12,[20][21][22][23]. However, mutations can occur in some microorganisms due to the contamination of heavy metals in the environment.…”

Section: Discussionmentioning

confidence: 99%

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Characterization and Sorptivity of the Plesiomonas shigelloides Strain and Its Potential Use to Remove Cd2+ from Wastewater

Xue

et al. 2016

Water

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Abstract:In this study, the ability of adsorbing Cd 2+ ions of Plesiomonas shigelloides was discovered. Herein, the method and mechanisms of adsorbing Cd 2+ ions from aqueous solutions is discussed. The cadmium-resistant bacterium was collected from the sediment of Harbin section of the Songhua River in China, and then isolated, identified and characterized. The isolated strain was identified as Plesiomonas shigelloides H5 on the basis of morphological and biochemical characteristics, the sequencing of the 16SrDNA gene, and phylogeny analysis. P. shigelloides H5 was Gram-negative and bacillus. Maximum tolerance concentration (MTC) of the strain was 150 mg/L. The maximum adsorption rate and adsorption amounts was 42.71%˘0.88% and 106.775˘2.325 mg/g when dried biomass was presented in a 50 mg/L Cd 2+ solution. Dried biomass was in accordance with Lagergren pseudo-second-order models. A field emission scanning electron microscope (FE-SEM), an energy dispersive X-ray spectrometer (EDX), and Fourier transform infrared spectroscopy (FTIR) analyses were applied to identify the surface morphology and functional groups. Transmission electron microscope (TEM) results showed that Cd 2+ was also absorbed into cells to form precipitates. The results revealed that the surface functional groups of P. shigelloides H5 can bind to heavy metal ions. To sum up, the ability of adsorbing cadmium ions of Plesiomonas shigelloides was discovered, which might be helpful in wastewater treatment in the future.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 55%

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Characterization and Sorptivity of the Plesiomonas shigelloides Strain and Its Potential Use to Remove Cd2+ from Wastewater

Xue

et al. 2016

Water

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“…Expression levels of chrA and yieF after 30 min Cr (VI) treatment, copy numbers changes of chrA and yieF after 35 days of chromate incubation, and microbial biomass were assessed via real-time PCR. Reactions were performed on CFX96 TM Real-Time PCR Detection System (Bio-Rad) according to the manufacturer’s instructions ( Wu et al, 2014 ). All genes were analyzed in triplicate.…”

Section: Methodsmentioning

confidence: 99%

Microbial Community Structure and Function Indicate the Severity of Chromium Contamination of the Yellow River

Pei

et al. 2018

Front. Microbiol.

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The Yellow River is the most important water resource in northern China. In the recent past, heavy metal contamination has become severe due to industrial processes and other anthropogenic activities. In this study, riparian soil samples with varying levels of chromium (Cr) pollution severity were collected along the Gansu industrial reach of the Yellow River, including samples from uncontaminated sites (XC, XGU), slightly contaminated sites (LJX, XGD), and heavily contaminated sites (CG, XG). The Cr concentrations of these samples varied from 83.83 mg⋅kg-1 (XGU) to 506.58 mg⋅kg-1 (XG). The chromate [Cr (VI)] reducing ability in the soils collected in this study followed the sequence of the heavily contaminated > slightly contaminated > the un-contaminated. Common Cr remediation genes chrA and yieF were detected in the XG and CG samples. qRT-PCR results showed that the expression of chrA was up-regulated four and threefold in XG and CG samples, respectively, whereas the expression of yieF was up-regulated 66- and 7-fold in the same samples after 30 min treatment with Cr (VI). The copy numbers of chrA and yieF didn’t change after 35 days incubation with Cr (VI). The microbial communities in the Cr contaminated sampling sites were different from those in the uncontaminated samples. Especially, the relative abundances of Firmicutes and Bacteroidetes were higher while Actinobacteria was lower in the contaminated group than uncontaminated group. Further, potential indicator species, related to Cr such as Cr-remediation genera (Geobacter, PSB-M-3, Flavobacterium, and Methanosarcina); the Cr-sensitive genera (Skermanella, Iamia, Arthrobacter, and Candidatus Nitrososphaera) were also identified. These data revealed that Cr shifted microbial composition and function. Further, Cr (VI) reducing ability could be related with the expression of Cr remediation genes.

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“…The study of cadmium or arsenic resistance of enterococci has frequently involved isolates from habitats likely to encounter high levels of heavy metal pollution (Järup & Akesson, ). For instance, a strain closely related to E. faecalis isolated from petrochemical wastewater discharges in the Lanzhou reach of the Yellow River in China harbored cadA (and a panel of other heavy metal resistance determinants) whose expression was induced by exposure to cadmium (Wu et al, ). Analysis of enterococci from coastal marine sediments in Italy revealed that cadmium‐resistant isolates were significantly more frequent among those which were also resistant to erythromycin, even though the levels of cadmium were rather low (0.070–0.126 μg/g) (Vignaroli et al, ).…”

Section: Cadmium and Arsenic Resistance In Enterococcus Streptococcumentioning

confidence: 99%

Dissemination and conservation of cadmium and arsenic resistance determinants in Listeria and other Gram‐positive bacteria

Parsons

Lee

Kathariou

2020

Molecular Microbiology

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Metal homeostasis in bacteria is a complex and delicate balance. While some metals such as iron and copper are essential for cellular functions, others such as cadmium and arsenic are inherently cytotoxic. While bacteria regularly encounter essential metals, exposure to high levels of toxic metals such as cadmium and arsenic is only experienced in a handful of special habitats. Nonetheless, Listeria and other Gram‐positive bacteria have evolved an impressively diverse array of genetic tools for acquiring enhanced tolerance to such metals. Here, we summarize this fascinating collection of resistance determinants in Listeria, with special focus on resistance to cadmium and arsenic, as well as to biocides and antibiotics. We also provide a comparative description of such resistance determinants and adaptations in other Gram‐positive bacteria. The complex coselection of heavy metal resistance and other types of resistance seems to be universal across the Gram‐positive bacteria, while the type of coselected traits reflects the lifestyle of the specific microbe. The roles of heavy metal resistance genes in environmental adaptation and virulence appear to vary by genus, highlighting the need for further functional studies to explain the mystery behind the array of heavy metal resistance determinants dispersed and maintained among Gram‐positive bacteria.

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Enterococcus faecalisstrain LZ-11 isolated from Lanzhou reach of the Yellow River is able to resist and absorb Cadmium

Abstract: Lanzhou reach of the Yellow River is contaminated by heavy metals. Microbial research and remediation is still scarce. LZ-11 is the first strain that is able to resist and absorb Cd(II) isolated from this area and might be a good candidate for future cadmium bioremediation.

Cited by 15 publications

References 36 publications

Characterization and Sorptivity of the Plesiomonas shigelloides Strain and Its Potential Use to Remove Cd2+ from Wastewater

Characterization and Sorptivity of the Plesiomonas shigelloides Strain and Its Potential Use to Remove Cd2+ from Wastewater

Microbial Community Structure and Function Indicate the Severity of Chromium Contamination of the Yellow River

Dissemination and conservation of cadmium and arsenic resistance determinants in Listeria and other Gram‐positive bacteria

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