Evaluation of mtr cluster expression in Shewanella RCRI7 during uranium removal.

Abstract:

:In recent years, bioremediation is considered as an efficient method to remove the pollutants from the industrial wastewater. In this study, quantitative gene expressions (Real-time RT-PCR) of mtr gene cluster (mtrA, mtrB, mtrC, mtrD, mtrE, mtrF and omcA) in five different uranium concentrations (0.1, 0.25, 0.5, 1 and 2 mM) were performed with ICP and microscopic live cell counting analysis under anaerobic condition, by Shewanella RCRI7 as a native bacterium. The results indicated that the amount of uranium removal and live-cell counting were decreased in the higher uranium concentrations (1 and 2 mM), due to the uranium toxicity, suggesting 0.5 mM as the optimum uranium concentration for Shewanella RCRI7 resistance. The expression of mtrCED and omcA genes presented increasing trend in the lower uranium concentrations (0.1, 0.25 and 0.5 mM) and a decreasing trend in 1 and 2 mM, while mtrABF, presented an inverse pattern, proving the alternative role of mtrF for mtrC and omcA, as the substantial multiheme cytochromes in Extracellular Electron Transfer (EET) pathway. These data are a proof of these gene vital roles in the EET pathway, proposing them for genetic engineering toward EET optimization, as the certain pathway in heavy metal bioremediation process.

journal_name

Arch Microbiol

journal_title

Archives of microbiology

authors

Ghasemi R,Fatemi F,Mir-Derikvand M,Zarei M

doi

10.1007/s00203-020-01981-1

subject

Has Abstract

pub_date

2020-12-01 00:00:00

pages

2711-2726

issue

10

eissn

0302-8933

issn

1432-072X

pii

10.1007/s00203-020-01981-1

journal_volume

202

pub_type

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