Effect of denaturants on the structural properties of soybean lipoxygenase-1

Flaminia Malvezzi-Campeggi, Nicola Rosato, Alessandro Finazzi-Agrò, Mauro Maccarrone

Research output: Contribution to journalArticlepeer-review

Abstract

The effect of chemical (urea) and physical (temperature and high pressure) denaturation on the structural properties of soybean lipoxygenase-1 (LOX1) was analyzed through dynamic fluorescence spectroscopy and circular dichroism. We show that the fluorescence decay of the native protein could be fitted by two lorentzian distributions of lifetimes, centered at 1 and 4 ns. The analysis of the urea-denatured protein suggested that the shorter distribution is mostly due to the tryptophan residues located in the N-terminal domain of LOX1. We also show that a pressure of 2400 bar and a temperature of 55°C brought LOX-1 to a state similar to a recently described stable intermediate "I." Analysis of circular dichroism spectra indicated a substantial decrease of α-helix compared with β-structure under denaturing conditions, suggesting a higher stability of the N-terminal compared with the C-terminal domain in the denaturation process.

Original languageEnglish
Pages (from-to)1295-1300
Number of pages6
JournalBiochemical and Biophysical Research Communications
Volume289
Issue number5
DOIs
Publication statusPublished - Dec 21 2001

Keywords

  • Dynamic fluorescence
  • High pressure
  • Lipoxygenase
  • Protein stability

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

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