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Differential proteomic analysis of Aspergillus fumigatus morphotypes reveals putative drug targets
Paula H Kubitschek-Barreira1, Nathalia Curty, Gabriela W P Neves
1Laboratório de Micologia Celular e Proteômica, Instituto de Biologia, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil.
Abstract:
Aspergillus fumigatus is the main etiological agent of invasive aspergillosis, an important opportunistic infection for neutropenic patients. The main risk groups are patients with acute leukemia and bone marrow transplantation recipients. The lack of an early diagnostic test together with the limited spectrum of antifungal drugs remains a setback to the successful treatment of this disease. During invasive infection the inhaled fungal conidia enter the morphogenic cycle leading to angioinvasive hyphae. This work aimed to study differentially expressed proteins of A. fumigatus during morphogenesis. To achieve this goal, a 2D-DIGE approach was applied to study surface proteins extractable by reducing agents of two A. fumigatus morphotypes: germlings and hyphae. Sixty-three differentially expressed proteins were identified by MALDI-ToF/MS. We observed that proteins associated with biosynthetic pathways and proteins with multiple functions (miscellaneous) were over-expressed in the early stages of germination, while in hyphae, the most abundant proteins detected were related to metabolic processes or have unknown functions. Among the most interesting proteins regulated during morphogenesis, two putative drug targets were identified, the translational factor, eEF3 and the CipC-like protein. Neither of these proteins are present in mammalian cells.
Insights
This study identifies key proteins in Aspergillus fumigatus morphogenesis, revealing potential new drug targets like eEF3 and CipC-like proteins for invasive aspergillosis treatment.
Area of Science:
- Medical Mycology
- Molecular Biology
- Proteomics
Background:
- Invasive aspergillosis, caused by Aspergillus fumigatus, is a serious opportunistic infection in immunocompromised patients, particularly those with acute leukemia or undergoing bone marrow transplantation.
- Current diagnostic methods are limited, and the narrow spectrum of available antifungal drugs hinders effective treatment.
- Understanding the fungal morphogenic cycle is crucial for developing novel therapeutic strategies.
Purpose of the Study:
- To investigate differentially expressed proteins in Aspergillus fumigatus during its transition from conidia to hyphae (morphogenesis).
- To identify potential therapeutic targets by analyzing protein expression changes associated with fungal development.
Main Methods:
- Utilized 2D-Differential Gel Electrophoresis (2D-DIGE) to compare surface proteins of A. fumigatus germlings and hyphae.
- Employed MALDI-ToF/MS for the identification of differentially expressed proteins.
Main Results:
- Identified 63 differentially expressed proteins between germlings and hyphae.
- Observed overexpression of biosynthetic and miscellaneous proteins in early germlings, and metabolic or unknown function proteins in hyphae.
- Discovered two potential drug targets, translational factor eEF3 and CipC-like protein, which are absent in mammalian cells.
Conclusions:
- Differential protein expression during A. fumigatus morphogenesis offers insights into fungal adaptation and infection.
- The identified proteins eEF3 and CipC-like represent promising, host-specific targets for novel antifungal drug development against invasive aspergillosis.
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