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Updated: Oct 6, 2025
Bio-energetics Investigation of Candida albicans Using Real-time Extracellular Flux Analysis
Published on: March 19, 2019
Amino Acid Sensing and Assimilation by the Fungal Pathogen Candida albicans in the Human Host
Fitz Gerald S Silao1, Per O Ljungdahl1
1Department of Molecular Biosciences, Wenner-Gren Institute, SciLifeLab, Stockholm University, 114 19 Stockholm, Sweden.
Abstract:
Nutrient uptake is essential for cellular life and the capacity to perceive extracellular nutrients is critical for coordinating their uptake and metabolism. Commensal fungal pathogens, e.g., Candida albicans, have evolved in close association with human hosts and are well-adapted to using diverse nutrients found in discrete host niches. Human cells that cannot synthesize all amino acids require the uptake of the "essential amino acids" to remain viable. Consistently, high levels of amino acids circulate in the blood. Host proteins are rich sources of amino acids but their use depends on proteases to cleave them into smaller peptides and free amino acids. C. albicans responds to extracellular amino acids by pleiotropically enhancing their uptake and derive energy from their catabolism to power opportunistic virulent growth. Studies using Saccharomyces cerevisiae have established paradigms to understand metabolic processes in C. albicans; however, fundamental differences exist. The advent of CRISPR/Cas9-based methods facilitate genetic analysis in C. albicans, and state-of-the-art molecular biological techniques are being applied to directly examine growth requirements in vivo and in situ in infected hosts. The combination of divergent approaches can illuminate the biological roles of individual cellular components. Here we discuss recent findings regarding nutrient sensing with a focus on amino acid uptake and metabolism, processes that underlie the virulence of C. albicans.
Insights
Candida albicans utilizes host amino acids for energy and virulence. Understanding nutrient sensing and uptake in this fungal pathogen is key to developing new antifungal strategies.
Area of Science:
- Microbiology
- Molecular Biology
- Mycology
Background:
- Nutrient uptake is vital for cellular life, with extracellular nutrient perception guiding metabolism.
- Commensal fungi like Candida albicans are adapted to host environments and utilize diverse nutrients, including essential amino acids from the human host.
- Amino acid availability in the host, particularly from protein breakdown, fuels Candida albicans' growth and virulence.
Purpose of the Study:
- To review recent findings on nutrient sensing in Candida albicans, focusing on amino acid uptake and metabolism.
- To highlight the importance of amino acid metabolism in the opportunistic virulence of Candida albicans.
- To discuss how advanced genetic and molecular techniques are advancing the study of Candida albicans' nutrient requirements.
Main Methods:
- Review of recent scientific literature on nutrient sensing and amino acid metabolism in Candida albicans.
- Discussion of established paradigms from Saccharomyces cerevisiae and their limitations in Candida albicans.
- Highlighting the application of CRISPR/Cas9 and advanced molecular techniques for in vivo and in situ studies.
Main Results:
- Candida albicans efficiently senses and upregulates uptake of extracellular amino acids.
- Amino acid catabolism provides energy for Candida albicans, contributing to its virulent growth.
- Fundamental differences exist between Saccharomyces cerevisiae and Candida albicans in metabolic processes.
Conclusions:
- Amino acid uptake and metabolism are critical processes underlying the virulence of Candida albicans.
- Continued application of advanced molecular tools is crucial for dissecting nutrient sensing mechanisms.
- Understanding these pathways offers potential targets for therapeutic intervention against Candida albicans infections.
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