Processing of Peptides
Plant peptide signaling molecules are subject to proteolytic processing and/or to various forms of posttranslational modifications. Most signaling peptides are secreted and made as prepropeptides from which signal peptides are removed as they are translocated across the endoplasmic reticulum membrane. Proteolytic processing of propeptides may be required to regulate their activity, for peptides to fold properly, to navigate the secretory pathway, and to diffuse freely in the apoplast. Posttranslational modifications of peptides in plants include tyrosine sulfation, proline hydroxylation, and hydroxyproline arabinosylation. The proteases responsible for processing some plant peptides have been determined and shown considerable specificity for their propeptide substrates. New high-throughput screening technologies can be used to match up peptides to their processing machinery or identify propeptide substrates of various proteases.
KeywordsSecretory Pathway Amino Acid Peptide Mature Peptide Intramolecular Disulfide Bond Fluorogenic Peptide
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