1.13.11.15 | crystallizations of wild-type FeHPCD and mutant Y257F with bound substrates 3,4-dihydroxyphenylacetate and 4-nitrocatechol, hanging drop vapour diffusion method, in either 13% PEG 6000, 0.1 M calcium chloride, 0.1 M Tris-HCl, pH 6.5-7.4 or in 18% PEG 8000, 0.1 M calcium acetate, 0.1 M sodium cacodylate, pH 6.5, at 20°C, cryoprotectant solution containing either 20-25% PEG400 or 20% glycerol in the mother liquor solution, X-ray diffraction structure determination and analysis at 1.50-1.60 A resolution |