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Published on: March 19, 2019
Assessing Complex I (CI) Mitochondrial Subunit Protein Functions in Candida albicans
Dongmei Li1, Xiaodong She1,2, Richard Calderone1
1Department of Microbiology and Immunology, Georgetown University Medical Center, Washington, DC, USA.
Abstract:
Mitochondria of Candida species play critical roles in cell metabolism and pathogenesis. Greater emphasis in specific mitochondria activities of this fungus have been revealed through studies that defined fungal or Candida-specific subunit proteins of ETC Complexes I, III, and IV (CI, CIII, and CIV). Functional activities of these subunits have been characterized through the construction of single-gene null mutants. Activities common to mitochondria of most eukaryotes include their importance in metabolism, ATP synthesis, oxidative phosphorylation, oxygen consumption, and redox potential. An important difference among specific subunits compared to eukaryotic species is the role of CI fungal-specific subunit proteins in activities specific to Candida albicans, such as cell wall synthesis, especially cell wall mannan and β-glucan synthesis. We have associated cell wall synthesis with a signal transduction pathway that includes a Chk1p fungal-specific pathway. Recently, based upon the specificity of CI subunit specificities, a suggestion is the development of novel antifungals that target mitochondrial activity.
Insights
Mitochondria in Candida species are crucial for metabolism and pathogenesis. Specific mitochondrial proteins, particularly in Complex I, are vital for Candida albicans cell wall synthesis, suggesting new antifungal targets.
Area of Science:
- * Mitochondrial biology
- * Mycology
- * Cellular pathogenesis
Background:
- * Mitochondria are essential for Candida species' metabolism and pathogenesis.
- * Studies have identified fungal-specific subunits in electron transport chain (ETC) Complexes I, III, and IV (CI, CIII, CIV).
- * These subunits are crucial for understanding fungal-specific mitochondrial functions.
Purpose of the Study:
- * To investigate the role of fungal-specific mitochondrial proteins in Candida species.
- * To explore the connection between mitochondrial activity and cell wall synthesis in Candida albicans.
- * To identify potential novel antifungal targets within Candida mitochondria.
Main Methods:
- * Characterization of functional activities of specific mitochondrial subunits.
- * Construction and analysis of single-gene null mutants.
- * Association of cell wall synthesis with specific signal transduction pathways.
Main Results:
- * Fungal-specific subunit proteins of ETC Complexes I, III, and IV are critical for Candida metabolism and pathogenesis.
- * Complex I (CI) fungal-specific subunits play a unique role in Candida albicans cell wall synthesis, including mannan and β-glucan.
- * A link between cell wall synthesis and a fungal-specific Chk1p signal transduction pathway was established.
Conclusions:
- * Mitochondrial activity, particularly Complex I function, is integral to Candida albicans pathogenesis and cell wall integrity.
- * The identified fungal-specific mitochondrial pathways represent promising targets for novel antifungal drug development.
- * Targeting mitochondrial function offers a potential strategy against Candida infections.
