6.3.2.13 | crystals of native and selenomethionine MurE are grown in the presence of UDP-N-acetylmuramoyl-L-alanyl-D-glutamate, 0.002 ml of protein solution containing 10 mg/ml enzyme, 20 mM HEPES, pH 7.5 200 mM NaCl, 5 mM dithiothreitol and 1 mM UDP-N-acetylmuramoyl-L-alanyl-D-glutamate, are equilibrated together with 0.002 ml reservoir buffer consisting of 100 mM HEPES, pH 7.5, 13% polyethylene glycol monomethyl ether 5000, 500 mM LiCl, 10% isopropanol and 5 mM dithiothreitol, against 1 ml reservoir buffer, crystals diffract to 2.0 A |