Analysis of Sulfur Metasecretome in Mixed Cultures of Acidithiobacillus Thiooxidans and Acidithiobacillus Ferrooxidans

Abstract:

The role of biomolecules in bioleaching of copper sulphide minerals carried out by bacterial consortia with predominating acidithiobacilli species is of outmost interest. The proteomic analysis on bioleaching bacterial strains have been focused up to date on full Acidithiobacillus ferrooxidans proteome, allowing the identification of proteins belonging to the general stress response, phosphate limiting conditions and the ones linked to the periplasmic fraction. Our study shows for the first time the differential expression of secreted proteins by means of standard proteomics between pure cultures of Acidithiobacillus thiooxidans and in mixture with A. ferroxidans (metasecretome) grown in sulfur, where a set of proteins is de novo synthesized in the mixed culture, identifying an Omp40-like protein possibly related to bacterial adhesion, an hypothetical protein PSEEN2944 with unknown function and up-regulation of a cytochrome c biogenesis protein, findings that give an insight into the role of proteins at the sulfur – bacteria interface, highlighting the outputs of bacterial interactions in biomining environments at the protein secretion level.

• Periodical: Advanced Materials Research (Volumes 71-73)
• Pages: 151-154
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.71-73.151
• Online since: May 2009
• Authors: R.A. Bobadilla Fazzini, Pilar Parada Valdecantos
• Keywords: Bacterial Interaction, Bioleaching, Secretome

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