Geobacter bacteria use solid sulfur to breathe.

The reaction governs how sulfide moves through wetlands, sediments and flooded soils worldwide.

Elemental sulfur can’t dissolve, so the bacteria’s enzymes must act right at the cell’s outer membrane.

That sulfide then binds heavy metals in the sediment, controlling how they cycle through ecosystems.

How each outlet framed it
Phys.org
reconstructs enzyme MccSep using selenium-sulfur-heme center to reduce polysulfides, enabling biocatalysts and sulfur-cycle research

Sources: Phys.org