Some properties of p-coumarate decarboxylase from Cladosporium phlei.
The optimal pH and temperature of p-coumarate decarboxylase were 6.0 and 23 degrees C respectively. The enzyme activity was reduced to three quarters by heat treatment at 35 degrees C for 5 min and by half at 25 degrees C in 24 h, but kept almost unchanged at -20 degrees C at least for 10 days. The activity was not inhibited by potassium cyanide, sodium diethyldithiocarbamate, ethylenediaminetetraacetic acid disodium salt, or sodium citrate at 10 mM concentration, but was inhibited by p-chloromercuribenzoate or iodoacetate at 0.1 mM, the inhibition by the former being prevented to a great extent by the presence of reduced glutathione or dithiothreitol. The activity was inhibited by maleic acid cinnamic acid, or p-methoxycinnamic acid, but not by fumaric acid, acrylic acid, p-hydroxystyrene, furcatin p-hydroxyphenylacetic acid, or phloretic acid. An unsubstituted p-hydroxy group on the benzene ring and an acrylic acid side chain were required for the enzyme activity. Km value for trans-p-coumaric acid was about 6.5 X 10(-4) M.
D002245:Carbon Dioxide / Q000096:biosynthesis; D002262:Carboxy-Lyases / Q000037:antagonists & inhibitors / Q000378:metabolism; D002729:Chloromercuribenzoates / Q000494:pharmacology; D002934:Cinnamates / Q000494:pharmacology; D002963:Cladosporium / Q000201:enzymology*; D003373:Coumaric Acids / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D007461:Iodoacetates / Q000494:pharmacology; D008298:Maleates / Q000494:pharmacology; D003904:Mitosporic Fungi / Q000201:enzymology*; D013237:Stereoisomerism; D013696:Temperature
D002729:Chloromercuribenzoates; D002934:Cinnamates; D003373:Coumaric Acids; D007461:Iodoacetates; D008298:Maleates; D002245:Carbon Dioxide; D002262:Carboxy-Lyases