Class III peroxidases PRX01, PRX44, and PRX73 potentially target extensins during root hair growth in Arabidopsis thaliana

    April 2020 in “ Conicet ”
    Eliana Marzol, Cecilia Borassi, Philippe Ranocha, Ariel. A. Aptekman, Mauro Bringas, Janice Pennington, Julio Paéz-Valencia, Javier Martínez Pacheco, Diana Rosa Rodríguez Garcia, Yossmayer del Carmen Rondón Guerrero, Mariana Carignani Sardoy, Silvina Mangano, Margaret B. Fleming, John W. Mishler‐Elmore, Francisca Blanco‐Herrera, Patricia A. Bedinger, Christophe Dunand, Luciana Capece, Alejandro D. Nadra, Michael Held, Marisa S. Otegui, José M. Estevez
    TLDR PRX01, PRX44, and PRX73 affect root hair growth by interacting with extensins in Arabidopsis.
    The study investigated the role of three root hair-specific putative class-III peroxidases (PRX01, PRX44, and PRX73) in Arabidopsis thaliana, focusing on their potential interaction with extensins (EXTs) during root hair growth. Using genetic, biochemical, and modeling approaches, researchers found that the triple mutant prx01,44,73 and the PRX44 and PRX73 overexpressors exhibited opposite phenotypes in terms of root hair growth, peroxidase activity, and reactive oxygen species production, affecting cell wall thickness. Modeling suggested that these EXT-PRXs might interact with non-O-glycosylated EXT peptide sections, enhancing Tyr crosslinking and influencing cell wall properties during root hair cell expansion.
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