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Urease from Arthrobacter oxydans, a nickel-containing enzyme

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Abstract

In Arthrobacter oxydans, Klebsiella aerogenes and Sporosarcina ureae, growth with urea as a nitrogen source turned out to be more sensitive to inhibition by EDTA than that with ammonia. The inhibition was overcome by added nickel chloride, but not by other divalent metal ions tested. In A. oxydans the uptake of 63Ni was paralleled by an increase in urease (urea amidohydrolase, EC 3.5.1.5) activity under certain conditions. Following growth with radioactive nickel, urease from this strain was enriched by heat treatment and acetone fractionation. Copurification of 63Ni and urease was observed during subsequent Sephadex gel chromatography. Almost the entire labelling was detected together with the purified enzyme after focusing on polyacrylamide gel. The relative molecular mass of the purified urease was estimated to be 242,000. The pH optimum was 7.6, the K m-value 12.5 mmol/l and the temperature optimum 40°C; heat stability was observed up to 65°C. In presence of 10 mmol/l EDTA the protein-nickel binding remained intact at pH 7; at pH 5 and below, nickel was irreversibly removed with concommitant loss of enzyme activity. The results demonstrated that nickel ions are required for active urease formation in the bacterial strains studied, and that urease from A. oxydans is a nickel-containing enzyme.

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  1. Fachrichtung Mikrobiologie der Universität des Saarlandes, Im Stadtwald, D-6600, Saarbrücken, Federal Republic of Germany

    Jürgen Schneider & Heinrich Kaltwasser

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  1. Jürgen Schneider
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  2. Heinrich Kaltwasser
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Dedicated to Professor Dr. H.-G. Schlegel on the occasion of his 60th birthday

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Schneider, J., Kaltwasser, H. Urease from Arthrobacter oxydans, a nickel-containing enzyme. Arch. Microbiol. 139, 355–360 (1984). https://doi.org/10.1007/BF00408379

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  • DOI: https://doi.org/10.1007/BF00408379

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