3.4.23.29 crystallization by hanging drop method with ammonium sulfate as precipitant, X-ray diffraction structure determination and analysis at 1.9 A resolution 668788 3.4.23.29 enzyme from Fr. KY 2901 and mutant enzymes produced by irradiation with UV-light 30731 3.4.23.29 purified enzyme in complex with inhibitor pepstatin, hanging drop vapour diffusion method, 0.005 ml of 10 mg/ml protein is mixed with 0.005 ml of reservoir solution containing 50% ammonium sulfate in 10 mM sodium citrate-sulfate buffer, pH 5.4, 20°C, X-ray diffraction structure determination and analysis at 1.3 A resolution, structure modeling 669833