Soil Acidobacteria Strain AB23 Resistance to Oxidative Stress Through Production of Carotenoids.

Soil Acidobacteria Strain AB23 Resistance to Oxidative Stress Through Production of Carotenoids. Microb Ecol. 2020 Jul 02;: Authors: Pinto OHB, Costa FS, Rodrigues GR, da Costa RA, da Rocha Fernandes G, Júnior ORP, Barreto CC Abstract Metagenomic studies revealed the prevalence of Acidobacteria in soils, but the physiological and ecological reasons for their success are not well understood. Many Acidobacteria exhibit carotenoid-related pigments, which may be involved in their tolerance of environmental stress. The aim of this work was to investigate the role of the orange pigments produced by Acidobacteria strain AB23 isolated from a savannah-like soil and to identify putative carotenoid genes in Acidobacteria genomes. Phylogenetic analysis revealed that strain AB23 belongs to the Occallatibacter genus from the class Acidobacteriia (subdivision 1). Strain AB23 produced carotenoids in the presence of light and vitamins; however, the growth rate and biomass decreased when cells were exposed to light. The presence of carotenoids resulted in tolerance to hydrogen peroxide. Comparative genomics revealed that all members of Acidobacteriia with available genomes possess the complete gene cluster for phytoene production. Some Acidobacteriia members have an additional gene cluster that may be involved in the production of colored carotenoids. Both colored and colorless carotenoids are involved in tolerance to oxidative stress. These results ...
Source: Microbial Ecology - Category: Microbiology Authors: Tags: Microb Ecol Source Type: research