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. 1993 Nov;175(21):6745–6754. doi: 10.1128/jb.175.21.6745-6754.1993

Purification and characterization of maleylacetate reductase from Alcaligenes eutrophus JMP134(pJP4).

V Seibert 1, K Stadler-Fritzsche 1, M Schlömann 1
PMCID: PMC206796  PMID: 8226615

Abstract

Maleylacetate reductase (EC 1.3.1.32) plays a major role in the degradation of chloroaromatic compounds by channeling maleylacetate and some of its substituted derivatives into the 3-oxoadipate pathway. The enzyme was purified to apparent homogeneity from an extract of 2,4-dichlorophenoxyacetate (2,4-D)-grown cells of Alcaligenes eutrophus JMP134. Maleylacetate reductase appears to be a dimer of two identical subunits of 35 kDa. The pI was determined to be at pH 5.4. There was no indication of a flavin prosthetic group. The enzyme was inactivated by p-chloromercuribenzoate but not by EDTA, 1,10-phenanthroline, or dithiothreitol. Maleylacetate and 2-chloromaleylacetate were converted with similar efficiencies (with NADH as cosubstrate, Km = 31 microM for each substrate and kcat = 8,785 and 7,280/min, respectively). NADH was preferred to NADPH as the cosubstrate. Upon reduction of 2-chloramaleylacetate by the purified enzyme, chloride was liberated and the resulting maleylacetate was further reduced by a second NADH. These results and the kinetic parameters suggest that the maleylacetate reductase is sufficient to channel the 2,4-D degradation intermediate 2-chloromaleylacetate into the 3-oxoadipate pathway. In a data base search the NH2-terminal sequence of maleylacetate reductase was found to be most similar to that of TfdF, a pJP4-encoded protein of as-yet-unknown function in 2,4-D degradation.

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Selected References

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