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C-terminal His-tagged enzyme is prepared for crystallization. The N-terminal Met is replaced by Ser-Leu. Crystals of the selenomethionine enzyme are grown in 13% polyethylene glycol, 0.1 M [bis(2-hydroxyethyl)imino]-tris(hydroxymethyl)methane (pH 6.0) and 0.2 M lithium sulfate at 18°C using the hanging drop vapor diffusion method. They are incubated in the presence of 30% glycerol before being flash-frozen in liquid nitrogen. The crystals belong to trigonal space group P3(1)21 with a = b = 69.9 A and c = 117.2 A
1000fold decrease in the kcat/Km is observed with the 4-hydroxyphenylacetyl-CoA, and a 100fold decrease in the kcat/Km value is observed with the 3-hydroxyphenylacetyl-CoA or 3,4-dihydroxyphenylacetyl-CoA