Stabilization of heat-induced changes in plant peroxidase preparations by ClpX, a bacterial heat shock protein

Barbara Kroczynska*, Arkadiusz Ciesielski, Lucrezia Sergio

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Peroxidases (PODs) are known to be quite stable at elevated temperatures. Moreover, partially denatured peroxidases are able to regain their catalytic activity during incubation at room temperature. In this paper, we describe the effects of some heat shock proteins on the self-reactivation of plant peroxidase preparations. Horseradish and artichoke peroxidases (HRP and ARP, respectively) were first heated (at 60°C or 90°C), then incubated at a slightly elevated temperature (30°C). The heat-treatment resulted in a considerable loss of activity of both enzymes but the subsequent incubation allowed their reactivation. However, no reactivation could be detected when incubation was carried out in the presence of the molecular chaperone ClpX. Other chaperones that were tested (DnaK, DnaJ and GrpE) did not show the inhibitory effect. Electrophoretic analyses further indicated that the heat-treated horseradish peroxidase, but not the native enzyme, binds to ClpX eliminating the possibility of undesirable protein refolding that would result in aggregation.

Original languageEnglish (US)
Pages (from-to)1295-1299
Number of pages5
JournalJournal of Plant Physiology
Issue number12
StatePublished - Dec 1 2002


  • ClpX
  • Horseradish peroxidase
  • Molecular chaperone
  • Protein-protein interaction
  • Self-renaturation

ASJC Scopus subject areas

  • Physiology
  • Agronomy and Crop Science
  • Plant Science

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