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Widespread metal\u2010reducing bacteria\n                    <jats:italic>Shewanella<\/jats:italic>\n                    spp. have a unique ability of extracellular electron transfer (EET); however, their EET activity and underlying mechanisms under high\u2010salinity stress in the deep sea remain poorly explored. Here, we studied the EET process and the underlying metabolic mechanism based on a deep\u2010sea bacterium\n                    <jats:styled-content style=\"fixed-case\">\n                      <jats:italic>Shewanella piezotolerans<\/jats:italic>\n                    <\/jats:styled-content>\n                    WP3.\n                    <jats:styled-content style=\"fixed-case\">\n                      <jats:italic>S. piezotolerans<\/jats:italic>\n                    <\/jats:styled-content>\n                    WP3 has comparable electroactivity to the model strain\n                    <jats:styled-content style=\"fixed-case\">\n                      <jats:italic>S. oneidensis<\/jats:italic>\n                    <\/jats:styled-content>\n                    MR\u20101, achieving a maximum current density of 9.7\u2009\u00b1\u20090.7\u2009\u03bcA\/cm\n                    <jats:sup>2<\/jats:sup>\n                    at 0.6\u2009V vs. Ag\/AgCl. Multiheme\u2010cytochrome OmcA\u2010MtrCAB complex contributed to the direct EET, with\n                    <jats:italic>mtrB, mtrA<\/jats:italic>\n                    and\n                    <jats:italic>omcA\u20101<\/jats:italic>\n                    upregulated and the redundant\n                    <jats:italic>omcA<\/jats:italic>\n                    genes (i.e.,\n                    <jats:italic>omcA\u20104<\/jats:italic>\n                    ,\n                    <jats:italic>omcA\u20103<\/jats:italic>\n                    ) exhibiting low expression. Riboflavin, synthesised from guanosine triphosphate under high\u2010salinity conditions, was secreted to facilitate EET. Enhanced glycolysis and TCA cycle activities under high anode potential (0.6\u2009V) were confirmed by the downregulation of intermediate metabolites (e.g., phosphoenolpyruvate) and the upregulation of corresponding genes (e.g., pyk), supporting the high energy yield for the EET process. Our findings provide new insights into the EET mechanisms of marine\n                    <jats:italic>Shewanella<\/jats:italic>\n                    , paving the way for the development of bioelectronic sensors and biotechnology applications in high\u2010salinity wastewater.\n                  <\/jats:p>","DOI":"10.1111\/1462-2920.70376","type":"journal-article","created":{"date-parts":[[2026,7,17]],"date-time":"2026-07-17T01:40:22Z","timestamp":1784252422000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Multi\u2010Omics Reveal Extracellular Electron Transfer Mechanism Under Deep\u2010Sea High Salinity"],"prefix":"10.1111","volume":"28","author":[{"given":"Huangxin","family":"Chen","sequence":"first","affiliation":[{"name":"College of Oceanography and Ecological Science Shanghai Ocean University  Shanghai 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