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Expression, purification, crystallization and preliminary crystallographic analysis of a stand-alone RAM domain with hydrolytic activity from the hyperthermophile Pyrococcus furiosus. | LitMetric
The RAM domain is one of several ligand-binding modules present in prokaryotes that are presumed to regulate the transcription of specific genes. To date, no hydrolytic activity has been reported for such modules. Curiously, a stand-alone RAM domain in Pyrococcus furiosus was isolated during a screen for hydrolytic activity against chromogenic esters. The gene encoding this protein was cloned and expressed in Escherichia coli and crystallized after a single purification step. X-ray diffraction data from the crystals were obtained to a resolution of 2.8 A using a conventional X-ray source. The cocrystallization of the recombinant protein with 1,2-epoxy-3-(4-nitrophenoxy)propane (EPNP) and phenylmethylsulfonyl fluoride (PMSF) produced crystals that yielded data to 2.2 and 2.8 A, respectively, using synchrotron radiation. Both the untreated and EPNP-treated crystals crystallize isomorphously in space group C2 and contain three dimers in the asymmetric unit. The PMSF-treated crystals also belong to this space group and have almost identical packing density, but show dramatically different unit-cell parameters.
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