Fungal histidine kinases.

Area of Science:

• Cellular signaling
• Microbiology
• Biochemistry

Background:

• Eukaryotic cells primarily use serine, threonine, and tyrosine phosphorylation for signal transduction.
• Prokaryotes predominantly use two-component systems involving His-Asp phosphotransfer.
• Recent discoveries reveal His-Asp phosphotransfer systems, including phosphorelays, in lower eukaryotes and plants.

Purpose of the Study:

• To explore the role of His-Asp phosphotransfer systems in eukaryotic signaling.
• To investigate the prevalence and function of phosphorelays in yeast species.
• To assess the potential of phosphorelays as targets for novel antimicrobial therapies.

Main Methods:

• Genetic screens and genome-wide analyses to identify sensor kinases and response regulators.
• Biochemical studies to elucidate phosphorelay mechanisms in yeasts.
• Comparative analysis of signaling pathways across different eukaryotic organisms.

Main Results:

• His-Asp phosphotransfer systems and phosphorelays are present in lower eukaryotes and plants.
• Phosphorelays mediate stress responses in yeasts like Saccharomyces cerevisiae and Schizosaccharomyces pombe.
• These systems are crucial for the virulence of microbial pathogens such as Candida albicans.

Conclusions:

• Eukaryotes employ His-Asp phosphotransfer, particularly phosphorelays, in specific signaling pathways.
• Yeast phosphorelays are essential for adaptive responses to environmental stresses.
• Targeting phosphorelay systems presents a promising strategy for developing new antibiotics against eukaryotic pathogens.