Proteomic profiling and glycomic analysis of the yeast cell wall in strains with Aflatoxin B1 elimination ability

The use of microorganisms for Aflatoxin B-1 elimination has been studied as a new alternative tool and it is known that cell wall carried out a critical role. For that reason, cell wall and soluble intracellular fraction of eight yeasts with AFB(1) detoxification capability were analysed. The quantitative and qualitative comparative label-free proteomic allowed the identification of diverse common constituent proteins, which revealed that putative cell wall proteins entailed less than 10% of the total proteome. It was possible to characterize different enzymes linked to cell wall polysaccharides biosynthesis as well as other proteins related with the cell wall organization and regulation. Additionally, the concentration of the principal polysaccharides was determined which permitted us to observe that beta-glucans concentration was higher than mannans in most of the samples. In order to better understand the biosorption role of the cell wall against the AFB(1), an antimycotic (Caspofungin) was used to damage the cell wall structure. This assay allowed the observation of an effect on the normal growth of those yeasts with damaged cell walls that were exposed to AFB(1). This effect was not observed in yeast with intact cell walls, which may reveal a protective role of this structure against mycotoxins.

Automated summary

The study on Aflatoxin B-1 elimination using microorganisms showed that cell wall proteins constituted less than 10% of the total proteome, indicating a potential protective role of intact cell walls against mycotoxins. It also identified enzymes related to cell wall polysaccharides biosynthesis and proteins associated with cell wall organization and regulation.