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Article Dans Une Revue Advanced Science Année : 2022

Periplasmic Bacterial Biomineralization of Copper Sulfide Nanoparticles

Jean Armengaud
Mihály Pósfai

Résumé

Metal sulfides are a common group of extracellular bacterial biominerals. However, only a few cases of intracellular biomineralization are reported in this group, mostly limited to greigite (Fe 3 S 4) in magnetotactic bacteria. Here, a previously unknown periplasmic biomineralization of copper sulfide produced by the magnetotactic bacterium Desulfamplus magnetovallimortis strain BW-1, a species known to mineralize greigite (Fe 3 S 4) and magnetite (Fe 3 O 4) in the cytoplasm is reported. BW-1 produces hundreds of spherical nanoparticles, composed of 1-2 nm substructures of a poorly crystalline hexagonal copper sulfide structure that remains in a thermodynamically unstable state. The particles appear to be surrounded by an organic matrix as found from staining and electron microscopy inspection. Differential proteomics suggests that periplasmic proteins, such as a DegP-like protein and a heavy metal-binding protein, could be involved in this biomineralization process. The unexpected periplasmic formation of copper sulfide nanoparticles in BW-1 reveals previously unknown possibilities for intracellular biomineralization that involves intriguing biological control and holds promise for biological metal recovery in times of copper shortage.
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hal-03830264 , version 1 (26-10-2022)

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Yeseul Park, Zohar Eyal, Péter Pekker, Daniel M. Chevrier, Christopher T Lefèvre, et al.. Periplasmic Bacterial Biomineralization of Copper Sulfide Nanoparticles. Advanced Science, 2022, 9 (28), pp.2203444. ⟨10.1002/advs.202203444⟩. ⟨hal-03830264⟩
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