Chitin Synthases with a Myosin Motor-Like Domain Control the Resistance of Aspergillus fumigatus to Echinocandins - Institut Pasteur Access content directly
Journal Articles Antimicrobial Agents and Chemotherapy Year : 2012

Chitin Synthases with a Myosin Motor-Like Domain Control the Resistance of Aspergillus fumigatus to Echinocandins

Abstract

Aspergillus fumigatus has two chitin synthases (CSMA and CSMB) with a myosin motor-like domain (MMD) arranged in a head-to-head configuration. To understand the function of these chitin synthases, single and double csm mutant strains were constructed and analyzed. Although there was a slight reduction in mycelial growth of the mutants, the total chitin synthase activity and the cell wall chitin content were similar in the mycelium of all of the mutants and the parental strain. In the conidia, chitin content in the ΔcsmA strain cell wall was less than half the amount found in the parental strain. In contrast, the ΔcsmB mutant strain and, unexpectedly, the ΔcsmA/ΔcsmB mutant strain did not show any modification of chitin content in their conidial cell walls. In contrast to the hydrophobic conidia of the parental strain, conidia of all of the csm mutants were hydrophilic due to the presence of an amorphous material covering the hydrophobic surface-rodlet layer. The deletion of CSM genes also resulted in an increased susceptibility of resting and germinating conidia to echinocandins. These results show that the deletion of the CSMA and CSMB genes induced a significant disorganization of the cell wall structure, even though they contribute only weakly to the overall cell wall chitin synthesis.

Domains

Mycology

Dates and versions

pasteur-01709201 , version 1 (14-02-2018)

Identifiers

Cite

Cristina Jiménez-Ortigosa, Vishukumar Aimanianda, Laetitia Muszkieta, Isabelle Mouyna, David Alsteens, et al.. Chitin Synthases with a Myosin Motor-Like Domain Control the Resistance of Aspergillus fumigatus to Echinocandins . Antimicrobial Agents and Chemotherapy, 2012, 56 (12), pp.6121 - 6131. ⟨10.1128/AAC.00752-12⟩. ⟨pasteur-01709201⟩

Collections

PASTEUR
24 View
0 Download

Altmetric

Share

Gmail Facebook X LinkedIn More