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. 2020 May 22;10:8503. doi: 10.1038/s41598-020-65107-9

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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The effects of potential Ni²⁺-chelators on nickel uptake and urease activity relative to an uninhibited control. The effects of the six compounds EDTA, DMG, NTA, L-cysteine, 1,2,4-butanetricarboxylic acid and oxalic acid on Ni uptake (a) and urease activity (b) relative to an uninhibited control in assays using strain E. coli XL1-Blue harbouring a plasmid carrying either the gene encoding the Ni transporter NiCoT (from K. pneumoniae) or Nik(MN)QO (from R. capsulatus) and a plasmid with the urease operon (from K. aerogenes). (a) The effect of the six compounds on Ni uptake (pmol NiCl₂/mg protein) shown as the mean percentage compared to the uninhibited control ±SD. (b) The effect of the six compounds on urease activity (mU/mg protein) shown as the mean percentage compared to the uninhibited control ±SD. E. coli expressing the NiCoT transporter (dark grey bars) or the Nik(MN)QO transporter (light grey bars) were used in both assays.