Characterization of the wound-induced metallocarboxypeptidase inhibitor from potato: cDNA sequence, induction of gene expression, subcellular immunolocalization and potential roles of the C-terminal propeptide

Josep Villanueva, Francesc Canals, Salomé Prat, Dolors Ludevid, Enrique Querol, Francesc X. Avilés

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41 Citations (Scopus)

Abstract

A partial cDNA clone for the potato wound-inducible metallocarboxypeptidase inhibitor (PCI) was isolated from a cDNA library constructed from mRNA of abscisic acid (ABA)-treated potato leaves. The full 5' region of the cDNA was obtained through a RACE-PCR protocol. PCI mRNA encodes a precursor polypeptide which comprises a 29 residue N-terminal signal peptide, a 27 residue N-terminal pro-region, the 39 residue mature PCI protein, and a 7 residue C-terminal extension. Northern blot analysis demonstrates that the PCI gene is transcriptionally activated by wounding, and wound signaling can be induced by ABA and jasmonic acid. Subcellular localization of the protein was investigated by immunocytochemistry and electron microscopy, showing that PCI accumulates within the vacuole. A partial PCI precursor form, comprising the mature protein and the C-terminal extension, has been expressed in Escherichia coli and characterized. Its inability to inhibit carboxypeptidases, and stability to carboxypeptidase digestion, suggest that the C-terminal pro-domain may have, besides a probable vacuolar sorting function, a role in modulation of the inhibitory activity of PCI. Copyright (C) 1998 Federation of European Biochemical Societies.
Original languageEnglish
Pages (from-to)175-182
JournalFEBS Letters
Volume440
Issue number1-2
DOIs
Publication statusPublished - 27 Nov 1998

Keywords

  • Metallocarboxypeptidase inhibitor
  • Precursor protein
  • Solanum tuberosum
  • Vacuolar sorting
  • Wound-inducible expression

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