Antonie van Leeuwenhoek

, Volume 85, Issue 2, pp 129–139 | Cite as

Isolation and characterization of a lipoxygenase from Pseudomonas 42A2 responsible for the biotransformation of oleic acid into (S)-(E)-10-hydroxy-8-octadecenoic acid

  • M. Busquets
  • V. Deroncelé
  • J. Vidal-Mas
  • E. Rodríguez
  • A. Guerrero
  • A. Manresa


The isolation of a new lipoxygenase-like (LOX-like) enzyme from Pseudomonas 42A2 and its characterization is described. The enzyme, located in the periplasm of the cell, which contained 0.55 mol of Fe2+ per mol of protein, is monomeric and has a molecular mass of 45 kDa. In the presence of oxygen, the enzyme converts oleic acid into (E)-10-hydroperoxy-8-octadecenoic acid (HPOD), which decomposes to the corresponding (E)-10-hydroxy-8-octadecenoic acid (HOD). The absolute configuration of this acid was determined as S on the basis of exciton-coupled CD data, and specific rotation and NMR analysis of the corresponding p-bromobenzoate derivative. The reaction in vivo leads to the dihydroxy derivative (E)-7,10-dihydroxy-8-octadecenoic acid (DHOD), so that the three hydroxy-fatty acids can be isolated from the culture medium. The activity of the enzyme was optimal between 25 and 30 °C and 44% of its activity still remained at 55 °C. Its optimal pH is 8.5–9; and the presence of magnesium ions increased LOX activity by 1.5. The activity of the LOX is highest in unsaturated fatty acids containing double bonds in position 9 (oleic, linoleic and linolenic acids), linoleic acid being preferred (100% activity) over linolenic (60.4%) and oleic acids (46%). However, kinetic studies showed that the affinity of the enzyme is similar for the three substrates.

Absolute configuration Biotransformation Lipoxygenase-like Hydroxy-fatty acids Oleic acid Pseudomonas 


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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • M. Busquets
    • 1
  • V. Deroncelé
    • 2
  • J. Vidal-Mas
    • 2
  • E. Rodríguez
    • 2
  • A. Guerrero
    • 1
  • A. Manresa
    • 2
  1. 1.Departamento de Bioquímica i Biologia Molecular, Facultat de QuímicaUniversitat de BarcelonaBarcelonaSpain
  2. 2.Laboratori de Microbiologia, Facultat de FarmaciaUniversitat de BarcelonaBarcelonaSpain

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