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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Beta-tubulin and benzimidazole resistance in the sheep nematode Haemonchus contortus.

We have compared benzimidazole (BZ) susceptible (s) and resistant (R) strains of Haemonchus contortus from sheep by two-dimensional polyacrylamide gel electrophoresis (2-D PAGE), Western blotting and ELISA techniques. The S strain bound more drug per mg protein than the R strain. BZ binding could be resolved into high-affinity and low-affinity binding. Low-affinity binding in parasite preparations devoid of tubulin was observed, but high-affinity binding occurred only in preparations containing tubulin. Resistance was associated with a decrease in the high affinity component. The S and R strains were shown by ELISA to contain similar total amounts of tubulin. By 2-D PAGE, the beta-tubulin isoform pattern of the S strain was different from that of the R strain, but the alpha-tubulin isoform patterns of the 2 strains were similar. BZ resistance was associated with a decrease in high-affinity BZ binding to tubulin and an alteration in beta-tubulin isoform pattern.[1]


  1. Beta-tubulin and benzimidazole resistance in the sheep nematode Haemonchus contortus. Lubega, G.W., Prichard, R.K. Mol. Biochem. Parasitol. (1991) [Pubmed]
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