Purification, crystallization and preliminary X-ray diffraction analysis of the RNA-dependent RNA polymerase from Thosea asigna virus

The RNA-dependent RNA polymerase of Thosea asigna virus has been purified and crystallized in two different crystal forms. Preliminary characterization of P2₁2₁2 and C222₁ crystals is reported. Co-crystallization experiments in the presence of lutetium produced a heavy-atom derivative suitable for structure determination.