Applying the Midas touch: Differing toxicity of mobile gold and platinum complexes drives biomineralization in the bacterium Cupriavidus metallidurans

Etschmann, Barbara; Brugger, Joël; Fairbrother, Lintern; Große, Cornelia; Nies, Dietrich H.; Martı́nez-Criado, Gema; Reith, Frank

doi:10.1016/j.chemgeo.2016.05.024

Cited by 24 publications

(5 citation statements)

References 61 publications

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“…Intuitively, in a low metabolic state, i.e., brought about by being re-suspended in water, if the bacteria could not efflux the highly oxidized platinum, then the cell's attempt to neutralise it internally could have been brought about by a fatal oxidative stress [6,15]. The minimum inhibitory concentrations measured in this experiment were one to two orders of magnitude less than that measured by Etschmann et al [60], i.e., 0.5 to 5 µM (Table 1) versus 200 µM for Pt(II)-chloride and 0.5 µM (Table 2) versus 17.5 µM for Pt(IV)-chloride. This discrepancy is explained by the affinity of Pt(II) and Pt(IV) for carboxyl groups (Figure 7) and by the use of a ca.…”

Section: Discussioncontrasting

confidence: 38%

“…This discrepancy is explained by the affinity of Pt(II) and Pt(IV) for carboxyl groups (Figure 7) and by the use of a ca. 10 mM gluconate culture medium in the Etschmann et al [60] MIC experiment; the gluconate would have complexed the Pt, reducing toxicity. It is also important to note that the bacteria were also able to immobilize more platinum from Pt(II) solutions than from Pt(IV) solutions.…”

Section: Discussionmentioning

confidence: 99%

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Immobilisation of Platinum by Cupriavidus metallidurans

et al. 2018

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Abstract:The metal resistant bacterium Cupriavidus metallidurans CH34, challenged with aqueous platinous and platinic chloride, rapidly immobilized platinum. XANES/EXAFS analysis of these reaction systems demonstrated that platinum binding shifted from chloride to carboxyl functional groups within the bacteria. Pt(IV) was more toxic than Pt(II), presumably due to the oxidative stress imparted by the platinic form. Platinum immobilisation increased with time and with increasing concentrations of platinum. From a bacterial perspective, intracellular platinum concentrations were two to three orders of magnitude greater than the fluid phase, and became saturated at almost molar concentrations in both reaction systems. TEM revealed that C. metallidurans was also able to precipitate nm-scale colloidal platinum, primarily along the cell envelope where energy generation/electron transport occurs. Cells enriched in platinum shed outer membrane vesicles that were enriched in metallic, colloidal platinum, likely representing an important detoxification strategy. The formation of organo-platinum compounds and membrane encapsulated nanophase platinum, supports a role for bacteria in the formation and transport of platinum in natural systems, forming dispersion halos important to metal exploration.

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Section: Discussioncontrasting

confidence: 38%

Section: Discussionmentioning

confidence: 99%

Immobilisation of Platinum by Cupriavidus metallidurans

et al. 2018

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“…1) под воздействием бактерий, которые используют их в качестве источника энергии (восстановительная биоминерализация золота) [19][20][21];…”

Section: Discussionunclassified

Minerals Au and Ag in the tailing dump of the processed ores (Salair, Russia)

Khusainova

Kalinin

Bortnikova

et al. 2023

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This article provides data on the identification and distribution of Au-Ag minerals in the tailing dump of the processed ores in the pyrite-polymetallic deposit within the Salair ore field (Talmovskiye Sands, Salair). The mineral and chemical compositions of the samples were studied using atomic absorption, mass spectrometry with inductively coupled plasma, X-ray diffractometry, and scanning electron microscopy. We have established that a horizon of secondary enrichment was formed (with Au and Ag contents up to 5,3 and 53.7 g/t, respectively) over a long period of the tailing dump existence (more than 90 years) and at a depth of 0,6-0,8 meters. Gold and silver are unevenly distributed along the section and are present in three species:1) native (Aus, Ags), 2) mineral (acantite, petrovskaite), and 3) isomorphic (sulfides and secondary films). The identified residual and newly formed gold-silver minerals indicate active supergene processes of Au-Ag dissolution, migration, and precipitation. The transformation of native particles occurs through both chemogenic and mechanical processes.

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“…In this microenvironment, high concentrations of Te oxyanions are the result of the oxidation of native tellurium under the influence of oxidised ground-and surface waters (Missen et al, 2022). An analogous process is well described on the surface of native gold grains in the regolith, resulting in the (bio)transformation of coarse hydrothermal gold into nano-to micro-particulate forms, a process driven by the high toxicity of dissolved ionic forms of gold (Fairbrother et al, 2013;Etschmann et al, 2016;Sanyal et al, 2019). Inorganic formation of Te NPs is unlikely to be dominant in the regolith due to a lack of suitable reductants (for instance, most Fe is found as oxidised Fe III rather than as Fe II ).…”

Section: Discussionmentioning

confidence: 99%