Vacuolar chitinases of tobacco: a new class of hydroxyproline-containing proteins

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Science  31 Jul 1992:
Vol. 257, Issue 5070, pp. 655-657
DOI: 10.1126/science.1496378


The fungicidal type I chitinases contribute to the defense response of plants against pathogens. Two tobacco chitinases represent a different class of hydroxyproline-containing proteins. Hydroxyproline-rich proteins are predominantly extracellular, structural glycoproteins proteins that lack enzymatic activity and contain many hydroxyproline residues. In contrast, type I chitinases are vacuolar enzymes. They are not glycosylated and contain a small number of hydroxyproline residues restricted to a single, short peptide sequence.