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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The Human PathogenParacoccidioides brasiliensisHas a Unique 1-Cys Peroxiredoxin That Localizes Both Intracellularly and at the Cell Surface

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Guilhen Longo, Larissa Valle [1] ; Breyer, Carlos Alexandre [2] ; Novaes, Gabriela Machado [2] ; Gegembauer, Gregory [1] ; Leitao Jr, Natanael Pinheiro ; Octaviano, Carla Elizabete [3] ; Toyama, Marcos Hikari [2] ; de Oliveira, Marcos Antonio [2] ; Puccia, Rosana [3]
Total Authors: 9
[1] Univ Fed Sao Paulo, Escola Paulista Med, Dept Microbiol Imunol & Parasitol, Sao Paulo - Brazil
[2] Univ Estadual Paulista Julio de Mesquita Fiiho, Inst Biociencias, Sao Paulo - Brazil
[3] Leitao Jr, Jr., Natanael Pinheiro, Univ Fed Sao Paulo, Escola Paulista Med, Dept Microbiol Imunol & Parasitol, Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Web of Science Citations: 0

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. (AU)

FAPESP's process: 13/07937-8 - Redoxome - Redox Processes in Biomedicine
Grantee:Ohara Augusto
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 17/19942-7 - Search for inhibitors of the peroxirredoxin system from pathogens and humans
Grantee:Marcos Antonio de Oliveira
Support type: Regular Research Grants
FAPESP's process: 06/05095-6 - Analysis of exported vesicular structures and of secreted molecules by the pathogenic fungi Paracoccidioides brasiliensis e Cryptococcus neoformans
Grantee:Rosana Puccia
Support type: Research Projects - Thematic Grants
FAPESP's process: 13/25950-1 - Expression and regulation of genes related to the cell wall from dimorphic pathogenic fungi under stress conditions
Grantee:Rosana Puccia
Support type: Regular Research Grants
FAPESP's process: 17/20291-0 - Characterization of the proinflammatory activity of a new serine protease (cdtsp-2) purified from the total venom of Crotalus durissus terrificus
Grantee:Marcos Hikari Toyama
Support type: Regular Research Grants
FAPESP's process: 11/13500-6 - Investigation of the molecular determinants involved in the interaction with substrates of Tsa1 and Tsa2 of Saccharomyces cerevisiae
Grantee:Carlos Alexandre Breyer
Support type: Scholarships in Brazil - Doctorate