Abstract
Nickel was found to be required for expression of urease activity in batch cultures of Thiocapsa roseopersicina strain 6311, Chromatium vinosum strain 1611 and Thiocystis violacea strain 2311, grown photolithotrophically with NH4Cl as nitrogen source. In a growth medium originally free of added nickel and EDTA, the addition of 0.1–10 μM nickel chloride caused an increase in urease activity, while addition of EDTA (0.01–2 mM) caused a strong reduction. Variation of the nitrogen source had no pronounced influence on the level of urease activity in T. roseopersicina grown with 0.1 μM nickel in the absence of EDTA. Only nickel, of several heavy metal ions tested, could reverse suppression of urease activity by EDTA. Nickel, however, did not stimulate and EDTA did not inhibit the enzyme in vitro. When nickel was added to cultures already growing in a nickel-deficient, EDTA-containing medium, urease activity showed a rapid increase which was not inhibited by chloramphenicol. It is concluded that the (inactive) urease apoprotein may be synthesized in the absence of nickel and can be activated in vivo without de novo protein synthesis by insertion of nickel into the pre-formed enzyme protein.
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Bast, E. Nickel requirement for the formation of active urease in purple sulfur bacteria (Chromatiaceae). Arch. Microbiol. 150, 6–10 (1988). https://doi.org/10.1007/BF00409709
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DOI: https://doi.org/10.1007/BF00409709