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Related Experiment Videos

Structural differences between two types of basidiomycete septal pore caps

Wally H Müller1,2, Roy C Montijn3, Bruno M Humbel2

  • 1Yeast Division of the Centraalbureau voor SchimmelculturesJulianalaan 67, 2628 BC DelftThe Netherlands.

Microbiology (Reading, England)
|August 8, 1998
PubMed
Summary

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The septal pore cap (SPC) structure and function vary between fungal species. Differences in SPC composition, like 1,6-beta-glucan presence, may reflect evolutionary adaptations for maintaining cellular integrity.

Area of Science:

  • Mycology
  • Cell Biology
  • Structural Biology

Background:

  • The septal pore cap (SPC) is a unique fungal structure associated with dolipore septa.
  • Its composition and function are not fully understood across different fungal species.

Purpose of the Study:

  • To compare the ultrastructure and composition of the SPC in two distinct fungal species: Trichosporon sporotrichoides and Schizophyllum commune.
  • To investigate the potential role of intracellular glucans in SPC morphology and function.

Main Methods:

  • High-pressure freezing and freeze-substitution techniques for electron microscopy.
  • Zinc/iodine/osmium tetroxide staining for ultrastructural analysis.
  • Immunolocalization of 1,6-beta-glucan.

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Main Results:

  • The SPC of T. sporotrichoides is vesicular-tubular and connected to the endoplasmic reticulum (ER), with dense staining. Its function appears ephemeral.
  • The SPC of S. commune is more complex, with perforations and a palisade-like matrix, connected to pore-occluding material by filamentous structures.
  • 1,6-beta-glucan is abundant in T. sporotrichoides SPCs and associated structures, potentially maintaining their integrity, but is absent in S. commune SPCs.

Conclusions:

  • Fungal SPCs exhibit significant structural and compositional diversity, correlating with species-specific requirements.
  • The presence of 1,6-beta-glucan in T. sporotrichoides suggests a role in SPC structural support, unlike in S. commune.
  • Evolutionary pressures may drive the diversification of SPCs and their associated components for maintaining cell integrity.