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Acta Crystallogr D Biol Crystallogr. 2004 Jul;60(Pt 7):1301-3. Epub 2004 Jun 22.

Expression, purification and crystallization of a functional core of the voltage-dependent calcium channel beta subunit.

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Department of Biochemistry, Faculty of Life Sciences, Tel Aviv University, Ramat Aviv 69978, Israel.


Two versions of the functional core of the rabbit voltage-dependent calcium channel beta2a subunit were expressed in Escherichia coli. These proteins were purified to homogeneity and screened for crystallization. Crystallization conditions were refined using the hanging-drop vapour-diffusion method and two crystal forms were pursued. Crystal form I is represented by thick rods with tetragonal symmetry, unit-cell parameters a = b = 75, c = 165 A and a diffraction limit of 3.4 A which were obtained using ammonium sulfate as a precipitant. Crystal form II gives rise to plates with orthorhombic symmetry, unit-cell parameters a = 35, b = 75, c = 165 A and a diffraction limit of 2.3 A which were grown using polyethylene glycol 20K as a precipitant.

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