Related Experiment Video
Updated: May 28, 2026
Metal-Limited Growth of Neisseria gonorrhoeae for Characterization of Metal-Responsive Genes and Metal Acquisition from Host Ligands
Published on: March 4, 2020
Proteomic profiling of the influence of iron availability on Cryptococcus gattii
Juliana Crestani1, Paulo Costa Carvalho, Xuemei Han
1Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, 43421, Caixa Postal 15005, Porto Alegre, RS 91501-970, Brazil.
Abstract:
Iron is essential and ubiquitous in living organisms. The competition for this micronutrient between the host and its pathogens has been related to disease establishment. Cryptococcus gattii is an encapsulated yeast that causes cryptococcosis mainly in immunocompetent individuals. In this study, we analyzed the proteomic profile of the C. gattii R265 Vancouver Island isolate under iron-depleted and -repleted conditions by multidimensional protein identification technology (MudPIT) and by 2D-GE. Proteins and key mechanisms affected by alteration of iron levels such as capsule production, cAMP-signaling pathway, response to stress, and metabolic pathways related to mitochondrial function were identified. Our results also show both proteomic methodologies employed to be complementary.
Insights
This study reveals how iron levels impact the encapsulated yeast Cryptococcus gattii. Understanding these iron-dependent mechanisms is key to combating fungal infections.
Area of Science:
- Microbiology
- Proteomics
- Infectious Diseases
Background:
- Iron is a vital micronutrient for all organisms, and its scarcity creates competition between hosts and pathogens.
- Cryptococcus gattii is an encapsulated yeast responsible for cryptococcosis, primarily affecting immunocompetent individuals.
Purpose of the Study:
- To investigate the proteomic profile of Cryptococcus gattii R265 under varying iron conditions.
- To identify key proteins and cellular mechanisms affected by iron availability in C. gattii.
Main Methods:
- Multidimensional protein identification technology (MudPIT)
- 2D gel electrophoresis (2D-GE)
Main Results:
- Alterations in iron levels significantly affect C. gattii's proteome.
- Identified key affected mechanisms include capsule production, cAMP signaling, stress response, and mitochondrial metabolic pathways.
- Both MudPIT and 2D-GE proved to be complementary proteomic approaches.
Conclusions:
- Iron availability influences critical virulence factors and metabolic functions in C. gattii.
- Proteomic analysis provides valuable insights into the host-pathogen iron competition dynamics.
- Complementary proteomic techniques enhance the comprehensive understanding of C. gattii's response to iron.
