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Biochemical characterization of trinitrotoluene transforming oxygen-insensitive nitroreductases from Clostridium acetobutylicum ATCC 824

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Abstract

The genes that encode oxygen-insensitive nitroreductases from Clostridium acetobutylicum possessing 2,4,6-Trinitrotoluene (TNT) transformation activity were cloned, sequenced and characterized. The gene products NitA (MW 31 kDa) and NitB (MW 23 kDa) were purified to homogeneity. The NitA and NitB are oxygen-insensitive nitroreductases comprised of a single nitroreductase domain. NitA and NitB enzymes show spectral characteristics similar to flavoproteins. The biochemical characteristics of NitA and NitB are highly similar to those of NfsA, the major nitroreductase from E. coli. NitA exhibited broad specificity similar to that of E. coli NfsA and displayed no flavin reductase activity. NitB showed broad substrate specificity toward nitrocompounds in a pattern similar to NfsA and NfsB of Escherichia coli. NitB has high sequence similarity to NAD(P)H nitroreductase from Archaeoglobus fulgidus. NitA could utilize only NADH as an electron donor, whereas NitB utilized both NADH and NADPH as electron donors with a preference for NADH. The activity of both nitroreductases was high toward 2,4-Dinitrotoluene (2,4-DNT) as a substrate. Both the nitroreductases were inhibited by dicoumarol and salicyl hydroxamate. The nitroreductases showed higher relative expression on induction with TNT, nitrofurazone and nitrofurantoin compared to the uninduced control.

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Acknowledgement

This material is based upon work supported by the U.S. Army Research Office DOD ARMY W911NF-04-1-0179.

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  1. Department of Biochemistry and Cell Biology MS-140, Rice University, Houston, TX 77005-1892, USA

    Razia Kutty & George N. Bennett

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  1. Razia Kutty
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Correspondence to George N. Bennett.

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Kutty, R., Bennett, G.N. Biochemical characterization of trinitrotoluene transforming oxygen-insensitive nitroreductases from Clostridium acetobutylicum ATCC 824. Arch Microbiol 184, 158–167 (2005). https://doi.org/10.1007/s00203-005-0036-x

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