Free methionine-(R)-sulfoxide reductase (fRMsr) catalyzes the reduction of the free form of methionine-(R)-sulfoxide back to free methionine. The fRMsr protein from Staphylococcus aureus was overexpressed in Escherichia coli, purified and crystallized at 295 K using ammonium sulfate as a precipitant. Diffraction data were collected to 1.7 angstrom resolution from a native crystal using synchrotron radiation. The crystal belonged to the hexagonal space group P6(1)22, with unit-cell parameters a = b = 89.84, c = 88.75 angstrom, alpha = beta = 90, gamma = 120 degrees. Assuming the presence of one molecule in the asymmetric unit, the calculated Matthews coefficient value was 2.21 angstrom(3) Da(-1), with a solvent content of 57.1%.
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