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Fungal surface remodelling visualized by atomic force microscopy.

Hui Ma1, Laelie A Snook, Chunhong Tian

  • 1Department of Chemistry and Biochemistry, University of Regina, 3737 Wascana Parkway, Regina, SK, S4S 0A2, Canada.

Mycological Research
|August 8, 2006
PubMed
Summary
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Atomic force microscopy revealed Aspergillus nidulans fungal wall surface changes during non-polarized growth. Mutant hypA1 strains showed less organized surfaces and varied subunit sizes at restrictive temperatures.

Area of Science:

  • Mycology
  • Cell Biology
  • Biophysics

Background:

  • Fungal growth typically occurs at hyphal tips, but spore germination and some mutants exhibit non-polarized expansion.
  • Understanding fungal cell wall dynamics is crucial for controlling growth and development.

Purpose of the Study:

  • To investigate Aspergillus nidulans wall surface changes during non-polarized growth using atomic force microscopy (AFM).
  • To compare wild-type and hypA1 mutant strains under permissive and restrictive temperature conditions.

Main Methods:

  • Atomic force microscopy (AFM) was employed to visualize the surface ultrastructure of Aspergillus nidulans.
  • Comparative analysis of wild-type and hypA1 mutant strains grown at 28°C (permissive) and 42°C (restrictive).
  • Observation of conidia wetting and hyphal wall surface changes after temperature shifts.

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Main Results:

  • Dry conidia lost their hydrophobin coat upon wetting, indicating a transition from dormancy.
  • The hypA1 mutant grown at 42°C displayed less organized wall surfaces with a broader range of subunit sizes compared to wild-type.
  • Shifting hypA1 growth from 42°C to 28°C induced wall surface features similar to wild-type branching points.

Conclusions:

  • Fungal wall surface alterations in the hypA1 mutant provide insights into non-polarized growth mechanisms.
  • These findings contribute to understanding fungal germination and cell wall remodeling processes.
  • AFM is a valuable tool for detailing fungal cell wall surface dynamics.