The FNR-like domain of the Escherichia coli sulfite reductase flavoprotein subunit was crystallized using the hanging-drop technique, with PEG 4000 as precipitant. The crystals belong to space group P3112 or enantiomorph, with unit-cell parameters a = b = 171.0, c = 152.1 A. A solvent content of 75% was determined by a calibrated tetrachloromethane/toluene gradient which corresponds to three monomers per asymmetric unit. A 3 A resolution native data set was collected at beamline W32 of LURE, Orsay, France.
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