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The complex of RuvBL1 and its homologue RuvBL2, two evolutionarily highly conserved eukaryotic proteins belonging to the AAA+ (ATPase associated with diverse cellular activities) family of ATPases, was co-expressed in Escherichia coli. For crystallization purposes, the flexible domains II of RuvBL1 and RuvBL2 were truncated. The truncated RuvBL1–RuvBL2 complex was crystallized using the hanging-drop vapour-diffusion method at 293 K. The crystals were hexagonal-shaped plates and belonged to either the orthorhombic space group C2221, with unit-cell parameters a = 111.4, b = 188.0, c = 243.4 Å and six monomers in the asymmetric unit, or the monoclinic space group P21, with unit-cell parameters a = 109.2, b = 243.4, c = 109.3 Å, β = 118.7° and 12 monomers in the asymmetric unit. The crystal structure could be solved by molecular replacement in both possible space groups and the solutions obtained showed that the complex forms a dodecamer.
Keywords: RuvBL1; RuvBL2; ATPases.

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