Arsenic efflux in Enterobacter cloacae RSN3 isolated from arsenic-rich soil

In the present study, bacterial isolates were screened for arsenic resistance efficiency. Environmental isolates were isolated from arsenic-rich soil samples (i.e., from Rajnandgaon district of Chhattisgarh state, India). Amplification and sequencing of 16S rRNA gene revealed that the isolates were...

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Bibliographic Details
Published in:Folia microbiologica 2021-04, Vol.66 (2), p.189-196
Main Authors: Dash, Biplab, Sahu, Narayan, Singh, Anup Kumar, Gupta, S.B, Soni, Ravindra
Format: Article
Language:English
Subjects:
Achromobacter
Amplification
Applied Microbiology
Arsenates
Arsenic
Arsenite
Atomic absorption analysis
Atomic absorption spectroscopy
Atomic beam spectroscopy
Biomedical and Life Sciences
Cell size
Efflux
Enterobacter cloacae
Environmental Engineering/Biotechnology
Expulsion
Immunology
Life Sciences
Metal concentrations
Microbiology
Original Article
rRNA 16S
Scanning electron microscopy
Sodium arsenate
Spectral analysis
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Summary:In the present study, bacterial isolates were screened for arsenic resistance efficiency. Environmental isolates were isolated from arsenic-rich soil samples (i.e., from Rajnandgaon district of Chhattisgarh state, India). Amplification and sequencing of 16S rRNA gene revealed that the isolates were of Bacillus firmus RSN1 , Brevibacterium senegalense RSN2 , Enterobacter cloacae RSN3 , Stenotrophomonas pavanii RSN6 , Achromobacter mucicolens RSN7 , and Ochrobactrum intermedium RSN10 . Arsenite efflux gene ( arsB ) was successfully amplified in E. cloacae RSN3 . Atomic absorption spectroscopy (AAS) analysis showed an absorption of 32.22% arsenic by the RSN3 strain. Furthermore, results of scanning electron microscopy (SEM) for morphological variations revealed an initial increase in the cell size at 1 mM sodium arsenate; however, it was decreased at 10 mM concentration in comparison to control. This change of the cell size in different metal concentrations was due to the uptake and expulsion of the metal from the cell, which also confirmed the arsenite efflux system.
ISSN:0015-5632
1874-9356
DOI:10.1007/s12223-020-00832-2