# A yeast mating platform for multiplex screening of fungal GPCR–ligand interactions

## TL;DR

This paper introduces a new platform to study fungal communication and identify peptides that can disrupt it, offering a potential strategy to control plant-infecting fungi.

## Contribution

The novel Yeast Mating Platform (YeMaP) enables high-throughput screening of fungal GPCR–ligand interactions and identifies functional peptides.

## Key findings

- Peptides identified using YeMaP can interfere with fungal cell–cell communication in Fusarium oxysporum.
- YeMaP enables one-pot assays to study how abiotic factors affect multiple GPCR–pheromone interactions.
- The platform accelerates the discovery of agonist and antagonist peptides for fungal GPCRs.

## Abstract

Fungal pathogens rely on G protein–coupled receptors (GPCRs) to sense environmental cues and coordinate host infection. By establishing a yeast mating platform for multiplex GPCR–ligand screening, we identify agonist and antagonist peptides that can interfere with fungal cell–cell communication. This work not only accelerates the study of fungal GPCR–ligand interactions but also demonstrates, for the phytopathogen Fusarium oxysporum, that interfering with GPCR-mediated cell–cell communication is a promising target for antifungal strategies in agriculture.

Fungi are essential members across ecosystems, yet phytopathogenic fungi pose an increasing risk to crop yields. Despite their ecologic importance, cell–cell communication in fungi is underexplored, partly due to the lack of high-throughput techniques. Here, we developed a Yeast Mating Platform (YeMaP) to investigate the interaction between fungal G protein–coupled receptors (GPCRs) and pheromone peptides. We used YeMaP for high-throughput screening of 8,000 pheromone sequences and identified peptides with improved agonism or antagonism action. We found that these peptides can be applied in a native fungal system such as the plant pathogen Fusarium oxysporum, to control hyphal chemotropism and reduce plant root penetration. Additionally, we utilized YeMaP in a one-pot assay to investigate how abiotic factors influence the communication of multiple pheromone–GPCR combinations and found that the cell–cell communication mediated by the GPCR Ste2 from F. oxysporum signaled robustly across different abiotic factors, while other fungal GPCR–pheromone interactions were more sensitive to changes. Taken together, YeMaP accelerates the identification of fungal GPCR–peptide interactions by enabling one-pot assays, and serves as a model system for studying fungal cell–cell communication.