2.3.1.216 | purified detagged recombinant pentaketide chromone synthase, hanging drop vapour diffusion method, mixing of 500 nl of 10 mg/ml protein in 20 mM HEPES-NaOH, pH 7.0, containing 100 mM NaCl, and 2 mM DTT, with 500 nl reservoir solution containing 100 mM Tris-HCl, pH 8.5, 14% w/v PEG 8000, and 350 mM KF, 20°C, 2 days, X-ray diffraction structure determination and analysis at 1.6 A resolution |