The Role of RodA-Conserved Cysteine Residues in the Aspergillus fumigatus Conidial Surface Organization - Archive ouverte HAL Access content directly
Journal Articles Journal of Fungi Year : 2020

The Role of RodA-Conserved Cysteine Residues in the Aspergillus fumigatus Conidial Surface Organization

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Isabel Valsecchi
  • Function : Author
Jean-Paul Latgé
  • Function : Author
Jagadeesh Bayry

Abstract

Immune inertness of Aspergillusfumigatus conidia is attributed to its surface rodlet-layer made up of RodAp, characterized by eight conserved cysteine residues forming four disulfide bonds. Earlier, we showed that the conserved cysteine residue point (ccrp) mutations result in conidia devoid of the rodlet layer. Here, we extended our study comparing the surface organization and immunoreactivity of conidia carrying ccrp-mutations with the RODA deletion mutant (∆rodA). Western blot analysis using anti-RodAp antibodies indicated the absence of RodAp in the cytoplasm of ccrp-mutant conidia. Immunolabeling revealed differential reactivity to conidial surface glucans, the ccrp-mutant conidia preferentially binding to α-(1,3)-glucan, ∆rodA conidia selectively bound to β-(1,3)-glucan; the parental strain conidia showed negative labeling. However, permeability of ccrp-mutants and ∆rodA was similar to the parental strain conidia. Proteomic analyses of the conidial surface exposed proteins of the ccrp-mutants showed more similarities with the parental strain, but were significantly different from the ∆rodA. Ccrp-mutant conidia were less immunostimulatory compared to ∆rodA conidia. Our data suggest that (i) the conserved cysteine residues are essential for the trafficking of RodAp and the organization of the rodlet layer on the conidial surface, and (ii) targeted point mutation could be an alternative approach to study the role of fungal cell-wall genes in host-fungal interaction.
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Dates and versions

pasteur-02942748 , version 1 (18-09-2020)

Licence

Attribution - CC BY 4.0

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Cite

Isabel Valsecchi, Emmanuel Stephen-Victor, Sarah Sze Wah Wong, Anupama Karnam, Margaret Sunde, et al.. The Role of RodA-Conserved Cysteine Residues in the Aspergillus fumigatus Conidial Surface Organization. Journal of Fungi, 2020, 6 (3), pp.151. ⟨10.3390/jof6030151⟩. ⟨pasteur-02942748⟩
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