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Title: Response to vanadate exposure in Ochrobactrum tritici strains
Authors: Almeida, Mariana C. 
Branco, Rita 
Morais, Paula V. 
Issue Date: 2020
Publisher: Public Library of Science
Project: UID/ EMS/00285/2013 
PTW-PTDC/AAG-REC/3839/ 2014 
POCI-01-0145- FEDER-031820 
Renature - Centro-01-0145- FEDER-000007 
Serial title, monograph or event: PLoS ONE
Volume: 15
Issue: 2
Abstract: Vanadium is a transition metal that has been added recently to the EU list of Raw Critical Metals. The growing needs of vanadium primarily in the steel industry justify its increasing economic value. However, because mining of vanadium sources (i. e. ores, concentrates and vanadiferous slags) is expanding, so is vanadium environmental contamination. Bioleaching comes forth as smart strategy to deal with supply demand and environmental contamination. It requires organisms that are able to mobilize the metal and at the same time are resistant to the leachate generated. Here, we investigated the molecular mechanisms underlying vanadium resistance in Ochrobactrum tritici strains. The highly resistant strain 5bvl1 was able to grow at concentrations > 30 mM vanadate, while the O. tritici type strain only tolerated < 3 mM vanadate concentrations. Screening of O. tritici single mutants (chrA, chrC, chrF and recA) growth during vanadate exposure revealed that vanadate resistance was associated with chromate resistance mechanisms (in particular ChrA, an efflux pump and ChrC, a superoxide dismutase). We also showed that sensitivity to vanadate was correlated with increased accumulation of vanadate intracellularly, while in resistant cells this was not found. Other up-regulated proteins found during vanadate exposure were ABC transporters for methionine and iron, suggesting that cellular responses to vanadate toxicity may also induce changes in unspecific transport and chelation of vanadate.
ISSN: 1932-6203
DOI: 10.1371/journal.pone.0229359
Rights: openAccess
Appears in Collections:I&D CEMMPRE - Artigos em Revistas Internacionais

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