Abstract
Purified 2,4-dichlorophenoxyacetic acid (2,4-D)/(alpha)-ketoglutarate dioxygenase (TfdA) was shown to use 4-nitrophenoxyacetic acid (K(infm) = 0.89 (plusmn) 0.04 mM, k(infcat) [catalytic constant] = 540 (plusmn) 10 min(sup-1)), producing intensely yellow 4-nitrophenol. This reagent was used to develop a rapid, continuous, colorimetric assay for the detection of TfdA and analogous activities in 2,4-D-degrading bacterial cells and extracts.
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