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.
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.
Villanueva
J
J
Institut de Biologia Fonamental and Department de Bioquímica, Universitat Autònoma de Barcelona, Bellaterra, Spain.
Canals
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Prat
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Ludevid
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Querol
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Avilés
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D000040:Abscisic Acid / Q000494:pharmacology; D000595:Amino Acid Sequence; D001483:Base Sequence; D015152:Blotting, Northern; D002268:Carboxypeptidases / Q000037:antagonists & inhibitors / Q000378:metabolism; D043422:Carboxypeptidases A; D003517:Cyclopentanes / Q000494:pharmacology; D018506:Gene Expression Regulation, Plant; D018519:Meristem; D016253:Microscopy, Immunoelectron; D008969:Molecular Sequence Data; D054883:Oxylipins; D010196:Pancreatic Elastase / Q000378:metabolism; D018515:Plant Leaves; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D011480:Protease Inhibitors; D017510:Protein Folding; D011498:Protein Precursors / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D011994:Recombinant Proteins / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D017422:Sequence Analysis, DNA; D015398:Signal Transduction; D011198:Solanum tuberosum / Q000187:drug effects / Q000235:genetics* / Q000378:metabolism; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D014617:Vacuoles / Q000378:metabolism
D003517:Cyclopentanes; D054883:Oxylipins; D010940:Plant Proteins; D011480:Protease Inhibitors; D011498:Protein Precursors; D011994:Recombinant Proteins; C011006:jasmonic acid; D000040:Abscisic Acid; D002268:Carboxypeptidases; D043422:Carboxypeptidases A; D010196:Pancreatic Elastase