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.
journal_name
FEBS Lettjournal_title
FEBS lettersauthors
Villanueva J,Canals F,Prat S,Ludevid D,Querol E,Avilés FXdoi
10.1016/s0014-5793(98)01447-1subject
Has Abstractpub_date
1998-11-27 00:00:00pages
175-82issue
1-2eissn
0014-5793issn
1873-3468pii
S0014-5793(98)01447-1journal_volume
440pub_type
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