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Octaprenyl pyrophosphate synthase (OPPs), which belongs to the E-type prenyltransferase family, catalyses the successive condensation of farnesyl pyrophosphate with five isopentenyl pyrophosphate molecules to form trans-C40-octaprenyl pyrophosphate (OPP). OPP is essential for the biosynthesis of bacterial ubiquinone or menaquinone side chains, which play an important role in the electron-transport system. Here, Escherichia coli OPPs was expressed, purified and crystallized. The crystals, which belonged to the orthorhombic space group P21212, with unit-cell parameters a = 117.0, b = 128.4, c = 46.4 Å, were obtained by the sitting-drop vapour-diffusion method and diffracted to 2.2 Å resolution. Initial phase determination by molecular replacement (MR) clearly indicated that the crystal contained one homodimer per asymmetric unit. Further model building and structural refinement are in progress.

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