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Conserved Retrograde Trafficking Mechanisms Regulate Fungal Development and Pathogenicity Through
Yunfei Long1,2, Haoran Zhang1,2, Xingyuan Wu1,2
1State Key Laboratory of Agricultural and Forestry Biosecurity, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China.
Plant, Cell & Environment
|January 12, 2026
Summary
FgRab6 is crucial for retrograde transport in Fusarium graminearum, ensuring proper Golgi-associated retrograde protein (GARP) complex assembly. This pathway is vital for fungal development and pathogenicity, offering potential antifungal targets.
Area of Science:
- Cell Biology
- Molecular Biology
- Mycology
Background:
- Retrograde transport from endosomes to the trans-Golgi network (TGN) is vital for cellular function but its molecular mechanisms are not fully understood.
- The Golgi-associated retrograde protein (GARP) complex plays a key role in this process.
- Fusarium graminearum is a significant fungal pathogen impacting crop yields.
Purpose of the Study:
- To elucidate the molecular mechanism of retrograde transport mediated by the GARP complex in Fusarium graminearum.
- To identify key proteins involved in GARP complex localization and function.
- To investigate the role of this pathway in fungal pathogenicity.
Main Methods:
- Immunoprecipitation followed by mass spectrometry (IP-MS) to identify Rab GTPases interacting with the GARP complex.
- Genetic deletion studies (knockouts) to assess the function of FgRab6.
- Analysis of protein-protein interactions and localization using conserved residues.
- Microscopy to observe the localization of GARP complex subunits and SNARE proteins.
Main Results:
- Ten Rab GTPases were identified interacting with the GARP complex; only FgRab6 deletion disrupted GARP localization to the TGN.
- FgRab6 directly interacts with FgVps52 via a conserved Q73 residue, essential for fungal growth and pathogenicity.
- FgRab6 recruits FgVps52, initiating GARP complex assembly, which then recruits the retromer complex.
- This pathway ensures correct localization of SNARE proteins (FgSnc1, FgTlg1, FgTlg2) at endosomes and the TGN.
- Disruption of the FgRab6-GARP-retromer pathway severely impairs fungal development and virulence.
Conclusions:
- A novel FgRab6-GARP-retromer-coordinated vesicle trafficking pathway mediating retrograde transport of SNARE proteins has been identified in F. graminearum.
- This pathway is critical for the pathogenicity of F. graminearum.
- The findings provide mechanistic insights into vesicular transport and suggest potential targets for antifungal interventions.
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