A. Garrido-Peritierra, R. Cooper
Mar 3, 2005
Citations
0
Influential Citations
21
Citations
Journal
European journal of biochemistry
Abstract
The possible involvement of an isomerase in the 4-hydroxyphenylacetate meta-cleavage pathway has been studied. 5-Carboxymethyl-2-hydroxymuconate has been shown to undergo both spontaneous and enzyme-catalysed isomerisation to give 5-carboxymethyl-2-oxo-hex-3-ene-1,5-dioate, a compound with an absorbance maximum at 246 nm. The latter compound rather than the former is the substrate for a decarboxylase that produces 2-hydroxyhepta-2,4-diene,1,7-dioate. The isomerase and decarboxylase enzymes have been purified to over 90% homogeneity. Mg2+ is required for the decarboxylase reaction but not for the isomerase.