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Type 2 isopentenyl diphosphate isomerase (IDI-2) is a flavoprotein. Recently, flavin has been proposed to play a role as a general acid-base catalyst with no redox role during the enzyme reaction. To clarify the detailed enzyme reaction mechanism of IDI-2 and the unusual role of flavin, structural analysis of IDI-2 from Methanocaldococcus jannaschii (MjIDI) was performed. Recombinant MjIDI was crystallized at 293 K using calcium acetate as a precipitant. The diffraction of the crystal extended to 2.08 Å resolution at 100 K. The crystal belonged to the tetragonal space group I422, with unit-cell parameters a = 126.46, c = 120.03 Å. The presence of one monomer per asymmetric unit gives a crystal volume per protein weight (VM) of 3.0 Å3 Da-1 and a solvent constant of 59.0% by volume.

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