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Phytophthora capsici  Leonian is an important oomycete pathogen of crop vegetables, causing significant economic losses each year. Its cell wall, rich in cellulose, is vital for cellular integrity and for interactions with the host organisms. Predicted cellulose synthase (CesA) proteins are expected to catalyze the polymerization of cellulose, but this has not been biochemically demonstrated in an oomycete. Here, we present the properties of the four newly identified CesA proteins from  P. capsici  and compare their domain organization with that of CesAs from other lineages. Using a newly constructed glucosyltransferase-deficient variant of  Saccharomyces cerevisiae  with low residual background activity, we have achieved successful heterologous expression and biochemical characterization of a CesA protein from  P. capsici  ( Pc CesA1) .  Our results demonstrate that the individual  Pc CesA1 enzyme produces cellobiose as the major reaction product. Co-immunoprecipitation studies and activity assays revealed that several  Pc CesA proteins interact together to form a complex whose multiproteic nature is most likely required for cellulose microfibril formation. In addition to providing important insights into cellulose synthesis in the oomycetes, our data may assist the longer term identification of cell wall biosynthesis inhibitors to control infection by pathogenic oomycetes.

Analysis of a cellulose synthase catalytic subunit from the oomycete pathogen of crops Phytophthora capsici