Abstract
NaChBac from B. halodurans is a bacterial homologue of the eukaryotic voltage-gated sodium channels which has been expressed and purified from E. coli. We have previously shown (Nurani et al (2008) Biochemistry 31:8114-8121) that this membrane protein,, purified from E. coli, forms a mostly helical, tetrameric detergent-solubilisable protein that is capable of binding the drug mibefradil and inducing sodium flux when reconstituted into vesicles. The tetrameric quaternary structure of NaChBac differentiates it from the single-chain eukaryotic sodium channels.
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