We investigated the interaction of Rhipicephalus microplus midgut cells with Babesia bigemina sexual stages using a proteomic approach. A polypeptide from the R. microplus midgut that binds to proteins from B. bigemina sexual stages was identified and sequenced. Combining 2D overlay and tandem mass spectrometry (MS/MS) techniques, we determined that this polypeptide corresponds to a mitochondrial voltage-dependent anion-selective channel (VDAC). The vdac gene encoding the sequenced polypeptide was identified and sequenced. This is the first report of a VDAC-like protein in R. microplus, and a possible role for this protein in the B. bigemina infection process is suggested.
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