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The voltage-dependent anion channel (VDAC) is the major protein found in the outer membrane of mitochondria. The channel is responsible for the exchange of ATP/ADP and the translocation of ions and other small metabolites over the membrane. In order to obtain large amounts of pure and suitably folded human VDAC for functional and structural studies, the genes of the human isoforms I and II (HVDAC1 and HVDAC2) were cloned in Escherichia coli. High-level expression led to inclusion body formation. Both proteins could be refolded in vitro by adding denatured protein to a solution of zwitterionic or nonionic detergents. A highly efficient and fast protocol for refolding was developed that yielded more than 50 mg of pure human VDACs per liter of cell culture. The native and functional state of the refolded porins was probed by Fourier transform infrared spectroscopy to determine the secondary structure composition and by electrophysiological measurements, demonstrating the pore-forming activity of HVDAC1. Furthermore, binding of HVDAC1 to immobilized ATP was demonstrated. Limited proteolysis of HVDAC1 protein embedded in detergent micelles in combination with matrix-assisted laser desorption ionization mass spectrometric analysis was applied to identify micelle-exposed regions of the protein and to develop an improved topology model. Our analysis strongly suggests a 16-stranded, antiparallel β-barrel with one large and seven short loops and turns. Initial crystallization trials of the protein yielded crystals diffracting to 8 Å resolution.
The Journal of Membrane Biology – Springer Journals
Published: Sep 9, 2007
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