Author(s): Guilhen Longo, Larissa Valle ; Breyer, Carlos Alexandre [UNESP] ; Novaes, Gabriela Machado [UNESP] ; Gegembauer, Gregory ; Leitao Jr, Natanael Pinheiro ; Octaviano, Carla Elizabete ; Toyama, Marcos Hikari [UNESP] ; Oliveira, Marcos Antonio de [UNESP] ; Puccia, Rosana
Date: 2020
Persistent ID: http://hdl.handle.net/11449/197902
Origin: Oasisbr
Subject(s): Paracoccidioides brasiliensis; 1-Cys Prx; hydroperoxides; peroxiredoxin; dimorphic fungi; ROS
Made available in DSpace on 2020-12-12T00:08:11Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-08-04
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Paracoccidioides brasiliensisis a temperature-dependent dimorphic fungus that causes systemic paracoccidioidomycosis, a granulomatous disease. The massive production of reactive oxygen species (ROS) by the host's cellular immune response is an essential strategy to restrain the fungal growth. Among the ROS, the hydroperoxides are very toxic antimicrobial compounds and fungal peroxidases are part of the pathogen neutralizing antioxidant arsenal against the host's defense. Among them, the peroxiredoxins are highlighted, since some estimates suggest that they are capable of decomposing most of the hydroperoxides generated in the host's mitochondria and cytosol. We presently characterized a uniqueP. brasiliensis1-Cys peroxiredoxin (PbPrx1). Our results reveal that it can decompose hydrogen peroxide and organic hydroperoxides very efficiently. We showed that dithiolic, but not monothiolic compounds or heterologous thioredoxin reductant systems, were able to retain the enzyme activity. Structural analysis revealed that PbPrx1 has an alpha/beta structure that is similar to the 1-Cys secondary structures described to date and that the quaternary conformation is represented by a dimer, independently of the redox state. We investigated the PbPrx1 localization using confocal microscopy, fluorescence-activated cell sorter, and immunoblot, and the results suggested that it localizes both in the cytoplasm and at the cell wall of the yeast and mycelial forms ofP. brasiliensis, as well as in the yeast mitochondria. Our present results point to a possible role of this uniqueP. brasiliensis1-Cys Prx1 in the fungal antioxidant defense mechanisms.
Univ Fed Sao Paulo, Escola Paulista Med, Dept Microbiol Imunol & Parasitol, Sao Paulo, Brazil
Univ Estadual Paulista Julio de Mesquita Fiiho, Inst Biociencias, Sao Paulo, Brazil
Univ Estadual Paulista Julio de Mesquita Fiiho, Inst Biociencias, Sao Paulo, Brazil
FAPESP: 06/05095-6
FAPESP: 07/50930-3
FAPESP: 11/13500-6
FAPESP: 13/07937-8
FAPESP: 13/25950-1
FAPESP: 17/19942-7
FAPESP: 17/20291-0
