Gene regulation of the Lactobacillus vini in response to industrial stress in the fuel ethanol production

Microbiological Research
Allyson Andrade MendonçaMarcos Antônio de Morais Júnior

Abstract

The industrial ethanol fermentation imposes several stresses to microorganisms. However, some bacterial species are well adapted and manage to endure these harmful conditions. Lactobacillus vini is one of the most found bacteria in these environments, indicating the existence of efficient tolerance mechanisms. In view of this premise, the present study aimed to describe the tolerance of L. vini to several stressing agents encounter in industrial environments and the genetic components of the stress response. In general, L. vini showed significant tolerance to stressors commonly found in fuel-ethanol fermentations, and only doses higher than normally reached in processes restrained its growth. The lag phase and the growth rate were the most responsive kinetic parameter affected. Gene expression analysis revealed that uspII gene positively responded to all conditions tested, a typical profile of a general stress response gene. In addition, the results also revealed aspects of regulatory modules of co-expressed genes responding to different stresses, and also the similarities of response mechanism with basis in common cellular damages. Altogether, these data contribute to uncover the factors that could favour L. vini in the indust...Continue Reading

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