O-Glycosylated Cell Wall Proteins Are Essential in Root Hair Growth

    June 2011 in “ Science ”
    Silvia M. Velasquez, Martiniano M. Ricardi, Javier Gloazzo Dorosz, Paula Virginia Fernández, Alejandro D. Nadra, Laércio Pol-Fachin, Jack Egelund, Sascha Gille, Jesper Harholt, Marina Ciancia, Hugo Verli, Markus Pauly, Antony Bacic, Carl Erik Olsen, Peter Ulvskov, Bent Larsen Petersen, Chris Somerville, Norberto D. Iusem, José M. Estevez
    TLDR Proteins with added sugars are crucial for plant root hair growth.
    The document from 2011 discusses the importance of O-glycosylated cell wall proteins in the growth of root hairs, which are crucial for nutrient absorption in plants. The study focused on the role of hydroxyproline-rich glycoproteins (HRGPs), including extensins (EXTs) and arabinogalactan-proteins (AGPs), which undergo proline hydroxylation and subsequent O-glycosylation. The researchers found that inhibiting or genetically disrupting prolyl 4-hydroxylases (P4Hs), which catalyze the hydroxylation, or arabinosyltransferases, which are involved in arabinosylation, led to impaired root hair growth and reduced arabinosylation of EXTs in Arabidopsis thaliana. This indicates that proper O-glycosylation of EXTs is critical for cell wall assembly and root hair elongation.
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