2.1.1.11 0.0006 - magnesium deuteroporphyrin determined using 250 microM S-adenosyl-L-methionine 684982 2.1.1.11 0.0006 - magnesium protoporphyrin concentrations between 0.3 and 30 microM in the presence of 50 nM enzyme 687761 2.1.1.11 0.0008 - zinc protoporphyrin determined using 250 microM S-adenosyl-L-methionine 684982 2.1.1.11 0.001 - magnesium mesoporphyrin determined using 250 microM S-adenosyl-L-methionine 684982 2.1.1.11 0.0173 - S-adenosyl-L-methionine at 30°C in 100 mM Tris pH 7.5 and 100 mM glycerol, in the presence of 0.004 mM magnesium chelatase 661705 2.1.1.11 0.0243 - S-adenosyl-L-methionine at 30°C in 100 mM Tris pH 7.5 and 100 mM glycerol, in the absence of magnesium chelatase 661705 2.1.1.11 0.036 - magnesium protoporphyrin IX pH 7.7, 25°C 485105 2.1.1.11 0.038 - S-adenosyl-L-methionine - 485113 2.1.1.11 0.039 - S-adenosyl-L-methionine - 485106 2.1.1.11 0.045 - S-adenosyl-L-methionine previously determined constant 684982