RRC ID 46944
Author Ueno K, Namiki Y, Mitani H, Yamaguchi M, Chibana H.
Title Differential cell wall remodeling of two chitin synthase deletants Δchs3A and Δchs3B in the pathogenic yeast Candida glabrata.
Journal FEMS Yeast Res
Abstract It is known that cell wall remodeling and the salvaging pathway act to compensate for an impaired or a damaged cell wall. Lately, it has been indicated that this mechanism is partly required for resistance to the glucan synthesis inhibitor echinocandin. While cell wall remodeling has been described in mutants of glucan or mannan synthesis, it has not yet been reported in a chitin synthesis mutant. Here, we describe a novel cell wall remodeling and salvaging pathway in chitin synthesis mutants, Δchs3A and Δchs3B, of the pathogenic yeast Candida glabrata. Electron microscopic analysis revealed a thickened mannoprotein layer in Δchs3A cells and a thickened chitin-glucan layer of Δchs3B cells, and it indicated the hypothesis that mannan synthase and chitin-glucan synthase indemnify Δchs3A and Δchs3B cells, respectively. The double-mutant CHS3A and MNN10, encoding α-1,6-mannosyltransferase, showed synergistic stress sensitization, and the Δchs3B strain showed supersensitivity to echinocandins. Hence, these findings support the above hypothesis of remodeling. Furthermore, unlike Δchs3A cells, Δchs3B cells showed supersensitivity to calcineurin inhibitor FK506 and Tor1p kinase inhibitor rapamycin, indicating that the Δchs3B strain uses the calcineurin pathway and a Tor1p kinase for cell wall remodeling.
Volume 11(5)
Pages 398-407
Published 2011-8-1
DOI 10.1111/j.1567-1364.2011.00728.x
PMID 21453325
MeSH Amino Acid Sequence Aminoglycosides / pharmacology Calcineurin / metabolism Candida glabrata / drug effects Candida glabrata / enzymology* Candida glabrata / genetics Candida glabrata / physiology Cell Wall / metabolism* Cell Wall / ultrastructure Chitin / antagonists & inhibitors Chitin / metabolism Chitin Synthase / genetics Chitin Synthase / metabolism* Echinocandins / pharmacology Fungal Proteins / genetics Fungal Proteins / metabolism Glucans / antagonists & inhibitors Glucans / metabolism Mannans / metabolism Membrane Glycoproteins / metabolism Sequence Alignment Sequence Deletion Signal Transduction Stress, Physiological
IF 3.193
Times Cited 11
Pathogenic microorganisms