Fusicoccin effect on the in vitro interaction between plant 14-3-3 proteins and plasma membrane H+-ATPase

Maria Rosaria Fullone, Sabina Visconti, Mauro Marra, Vincenzo Fogliano, Patrizia Aducci*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

81 Citations (Scopus)

Abstract

A 17-amino acid peptide was selectively cleaved from the highly variant C terminus of the 33-kDa 14-3-3 isoform occurring in fusicoccin receptor preparations from maize and was sequenced. The determined C-terminal sequence was identical to that of the already known maize 14-3-3 homolog GF14-6, thus prompting the use of recombinant GF14-6 in an in vitro protein-protein interaction study. The cDNA of GF14-6 was expressed in Escherichia coli as a 32P-phosphorylatable glutathione S-transferase fusion protein and was used as a probe in overlay experiments with H+-ATPase partially purified from maize roots. The results demonstrated that the recombinant protein specifically bound to H+-ATPase. The binding was dependent on Mg2+ and was strongly increased by fusicoccin. Controlled trypsin digestion of H+-ATPase abolished the association with GF14-6, a finding that was suggestive of an interaction with the C terminus of the enzyme. To confirm this result, the C- terminal domain of H+-ATPase was expressed as a glutathione S-transferase fusion peptide and was used in overlay experiments. GF14-6 was also able to bind to the isolated C terminus, but only in the presence of fusicoccin.

Original languageEnglish
Pages (from-to)7698-7702
Number of pages5
JournalJournal of Biological Chemistry
Volume273
Issue number13
DOIs
Publication statusPublished - 27 Mar 1998
Externally publishedYes

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