Abstract
Albendazole is a benzimidazole drug which can be used to treat liver fluke (Fasciola hepatica) infections. Its mode of action is believed to be the inhibition of microtubule formation through binding to β-tubulin. However, F. hepatica expresses at least six different isotypes of β-tubulin, and this has confused, rather than clarified, understanding of the molecular mechanisms of benzimidazole drugs in this organism. Recombinant F. hepatica β-tubulin proteins were expressed in, and purified from, Escherichia coli. These proteins were then used in pull-down assays in which albendazole was covalently linked to Sepharose. β-Tubulin isotype 2 was pulled down in this assay, and this interaction could be reduced by adding competing albendazole. Molecular modelling of β-tubulin isotypes suggests that changes in the side change conformations of residue 200 in the putative albendazole binding site may be important in determining whether, or not, a particular isotype will bind to the drug. These results, together with previous work demonstrating that albendazole causes disruption of microtubules in the liver fluke, strongly suggest that β-tubulin isotype 2 is one of the targets of this drug.
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Abbreviations
- ABZ:
-
Albendazole
- ABZ.SO:
-
Albendazole sulphoxide
- IPTG:
-
Isopropyl-β-d-thiogalactopyranoside
- rmsd:
-
Root mean square deviation
- TCBZ:
-
Triclabendazole
- VdW:
-
Van der Waal’s
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Acknowledgements
EC and LAR were in receipt of PhD studentships from the Department of Agriculture and Rural Development (Northern Ireland).
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Chambers, E., Ryan, L.A., Hoey, E.M. et al. Liver fluke β-tubulin isotype 2 binds albendazole and is thus a probable target of this drug. Parasitol Res 107, 1257–1264 (2010). https://doi.org/10.1007/s00436-010-1997-5
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DOI: https://doi.org/10.1007/s00436-010-1997-5