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Type: Journal article
Title: Identification and characterization of the chitin synthase genes from the fish pathogen Saprolegnia parasitica
Author: Rzeszutek, E.
Díaz-Moreno, S.M.
Bulone, V.
Citation: Frontiers in Microbiology, 2019; 10:2873-1-2873-12
Publisher: Frontiers Media
Issue Date: 2019
ISSN: 1664-302X
1664-302X
Statement of
Responsibility: 
Elzbieta Rzeszutek, Sara M. Díaz-Moreno and Vincent Bulone
Abstract: Saprolegnia parasitica is a pathogenic oomycete responsible for severe fish infections. Despite its low abundance in the cell wall of S. parasitica, chitin is essential for hyphal growth as the inhibition of its biosynthesis leads to highly reduced growth. Here we identified and characterized chitin synthases (CHS) from S. parasitica as potential targets for anti-oomycete drugs. Bioinformatics analyses allowed the identification of six different putative Chs genes in the genome of the pathogen. The total number of genes was confirmed by Southern blot analysis and their expression levels were determined by quantitative PCR. Four of the six Chs genes were expressed in the mycelium, while the two others exhibited undetectable levels of expression. The mycelium was highly sensitive to the addition of nikkomycin Z (NZ) in the culture medium, which led to a decreased amount of chitin in the cell wall by up to 40% in the conditions tested, and to the formation of abnormal branching structures in the hyphae. The presence of NZ increased the expression level of one of the genes, Chs3, suggesting that the corresponding product is compensating the disruption of chitin biosynthesis in the hyphae. In addition, the activity of isolated CHS was strongly inhibited by NZ in vitro. Altogether our data indicate the importance of CHS for the vegetative growth of S. parasitica and demonstrate that these enzymes represent promising targets for the control of diseases caused by oomycetes.
Keywords: Chitin synthase genes; chitin biosynthesis; nikkomycin Z; oomycetes; Saprolegnia parasitica
Rights: Copyright © 2019 Rzeszutek, Díaz-Moreno and Bulone. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
RMID: 1000012362
DOI: 10.3389/fmicb.2019.02873
Appears in Collections:Agriculture, Food and Wine publications

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