Crystals of GlpE, a 12 kDa sulfurtransferase from Escherichia coli, display 1.06 angstrom resolution diffraction: a preliminary report

The Escherichia coli sn-glycerol 3-phosphate regulon contains the glpE gene coding for a 12 kDa protein which displays a sequence and a thiosulfate:cy anide sulfurtransferase activity similar to those of rhodanese enzymes. The GlpE protein was overexpressed, purified to homogeneity and crystallized i n the trigonal space group P3(1) (or P3(2)). The unit-cell parameters are a = b = 53.87, c = 30.52 Angstrom, gamma = 120 degrees. Evaluation of the cr ystal packing parameter establishes the presence of one molecule per asymme tric unit, with a solvent content of 42%. The GlpE crystals display very hi gh resolution diffraction; a 1.06 Angstrom data set was collected using syn chrotron radiation (lambda = 0.9102 Angstrom) with an overall completeness of 99.6%.