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A stress-responsive glyoxalase I from the parasitic nematode Onchocerca volvulus

A Sommer1, P Fischer, K Krause

  • 1Department of Biochemistry, Bernhard Nocht Institute for Tropical Medicine, Bernhard-Nocht-Strasse 74, 20359 Hamburg, Germany.

The Biochemical Journal
|February 15, 2001
PubMed

Insights

Glyoxalase I (GloI) from the parasitic nematode Onchocerca volvulus (Ov-GloI) was cloned and characterized. This enzyme is upregulated under oxidative stress and shows potential as a vaccine candidate or diagnostic tool for filarial infections.

Area of Science:

  • Biochemistry
  • Parasitology
  • Molecular Biology

Background:

  • Alpha-oxoaldehydes like glyoxal and methylglyoxal are toxic byproducts of metabolism.
  • The glyoxalase system, particularly glyoxalase I (GloI), detoxifies these compounds.
  • Understanding parasitic GloI is crucial for developing treatments and diagnostics for diseases like onchocerciasis.

Purpose of the Study:

  • To clone and characterize glyoxalase I (Ov-GloI) from Onchocerca volvulus.
  • To investigate the structural and functional properties of Ov-GloI.
  • To evaluate Ov-GloI as a potential target for vaccines or diagnostics against filarial parasites.

Main Methods:

  • Cloning and sequencing of Ov-GloI cDNA.
  • Heterologous expression in E. coli and protein purification.
  • 3D modeling based on human GloI structure.
  • Enzyme kinetics and inhibition studies.
  • Serological analysis using patient sera.
  • Gene expression analysis under oxidative stress using RT-PCR.

Main Results:

  • The Ov-GloI cDNA encodes a 21.9 kDa protein.
  • A 3D model revealed conserved core structure but distinct substrate-binding pocket residues compared to human GloI.
  • Recombinant Ov-GloI exhibited enzymatic activity and a dimeric structure.
  • Specific IgG1 antibodies were detected in sera from microfilaria carriers, indicating serological reactivity.
  • Ov-GloI gene expression was significantly upregulated under oxidative stress conditions.

Conclusions:

  • Ov-GloI plays a role in detoxifying alpha-oxoaldehydes in Onchocerca volvulus.
  • The structural differences in the substrate-binding pocket may be exploited for targeted drug development.
  • Ov-GloI is a promising candidate for serodiagnostic tools and potentially vaccines against onchocerciasis.

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