Cell wall polysaccharide synthases are located in detergent-resistant membrane microdomains in oomycetes.

Abstract:

:The pathways responsible for cell wall polysaccharide biosynthesis are vital in eukaryotic microorganisms. The corresponding synthases are potential targets of inhibitors such as fungicides. Despite their fundamental and economical importance, most polysaccharide synthases are not well characterized, and their molecular mechanisms are poorly understood. With the example of Saprolegnia monoica as a model organism, we show that chitin and (1-->3)-beta-d-glucan synthases are located in detergent-resistant membrane microdomains (DRMs) in oomycetes, a phylum that comprises some of the most devastating microorganisms in the agriculture and aquaculture industries. Interestingly, no cellulose synthase activity was detected in the DRMs. The purified DRMs exhibited similar biochemical features as lipid rafts from animal, plant, and yeast cells, although they contained some species-specific lipids. This report sheds light on the lipid environment of the (1-->3)-beta-d-glucan and chitin synthases, as well as on the sterol biosynthetic pathways in oomycetes. The results presented here are consistent with a function of lipid rafts in cell polarization and as platforms for sorting specific sets of proteins targeted to the plasma membrane, such as carbohydrate synthases. The involvement of DRMs in the biosynthesis of major cell wall polysaccharides in eukaryotic microorganisms suggests a function of lipid rafts in hyphal morphogenesis and tip growth.

journal_name

Appl Environ Microbiol

authors

Briolay A,Bouzenzana J,Guichardant M,Deshayes C,Sindt N,Bessueille L,Bulone V

doi

10.1128/AEM.02728-08

subject

Has Abstract

pub_date

2009-04-01 00:00:00

pages

1938-49

issue

7

eissn

0099-2240

issn

1098-5336

pii

AEM.02728-08

journal_volume

75

pub_type

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