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Title: Exploiting the biological response of two Serratia fonticola strains to the critical metals, gallium and indium
Authors: Caldeira, Joana B. 
Morais, Paula V. 
Branco, Rita 
Issue Date: 2020
Project: PTDC/CTA-AMB/31820/2017 funded by Fundação para a Ciência e Tecnologia (FCT) and Programa Operacional da Região Centro and by the project ERA-MIN/0002/2015 
FEDER funds through the program COMPETE—Programa Operacional Factores de Competitividade—and by national funds through FCT (UIDB/00285/2020) 
Serial title, monograph or event: Scientific Reports
Volume: 10
Issue: 1
Abstract: The use of microorganisms that allows the recovery of critical high-tech elements such as gallium (Ga) and indium (In) has been considered an excellent eco-strategy. In this perspective, it is relevant to understand the strategies of Ga and In resistant strains to cope with these critical metals. This study aimed to explore the effect of these metals on two Ga/In resistant strains and to scrutinize the biological processes behind the oxidative stress in response to exposure to these critical metals. Two strains of Serratia fonticola, A3242 and B2A1Ga1, with high resistance to Ga and In, were submitted to metal stress and their protein profiles showed an overexpressed Superoxide Dismutase (SOD) in presence of In. Results of inhibitor-protein native gel incubations identified the overexpressed enzyme as a Fe-SOD. Both strains exhibited a huge increase of oxidative stress when exposed to indium, visible by an extreme high amount of reactive oxygen species (ROS) production. The toxicity induced by indium triggered biological mechanisms of stress control namely, the decrease in reduced glutathione/total glutathione levels and an increase in the SOD activity. The effect of gallium in cells was not so boisterous, visible only by the decrease of reduced glutathione levels. Analysis of the cellular metabolic viability revealed that each strain was affected differently by the critical metals, which could be related to the distinct metal uptakes. Strain A3242 accumulated more Ga and In in comparison to strain B2A1Ga1, and showed lower metabolic activity. Understanding the biological response of the two metal resistant strains of S. fonticola to stress induced by Ga and In will tackle the current gap of information related with bacteria-critical metals interactions.
ISSN: 2045-2322
DOI: 10.1038/s41598-020-77447-7
Rights: openAccess
Appears in Collections:I&D CEMMPRE - Artigos em Revistas Internacionais

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