Project description:Iron availability affects oceanic primary productivity and the strength of the biological carbon pump. However, the mechanism of iron solubility in hypersaline environments is poorly understood. In this work, we investigated the extremely halophilic archaeon Haloferax volcanii to reduce ferrihydrite under 25% salinity, aiming to elucidate its energy metabolism associated with extracellular electron transfer (EET). Ferrihydrite reduction by H. volcanii reached a plateau around the eighth day, with an Fe(III) conversion of approximately 41%. The redox-active substances on the cell surface play a central role via EET. Proteomic analysis revealed that the relative abundance of membrane-bound quinoline b-type cytochrome oxidases (A0A841HB82, A0A841HBL7) increased by 73.8% and 120%, respectively, when H. volcanii used ferrihydrite rather than O2 as the terminal electron acceptor. Moreover, H. volcanii was found to secrete riboflavin which can function as an electron shuttle mediating indirect EET. Our findings provide insights into the survival and evolutionary strategies of early life in anaerobic environments on Earth , and the EET capability of H. volcanii highlights its potential applicability in the treatment of pollutants in hypersaline wastewater.

2026-02-08 | PXD074223 |

halophilic archaeon DL31

Project description:halophilic archaeon DL31 genome sequencing

| PRJNA52855 | ENA