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bioRxiv · 10.64898/2026.06.16.732578

Magnetic field enables spin matching in spin-selective pathways to enhance current in bacteria

Kathait, K.·Mishra, R.·Doyle, L. E.
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Abstract

Electroactive bacteria export metabolic electrons through cytochrome-based extracellular electron transfer (EET) conduits. Although purified Shewanella oneidensis EET cytochromes are chiral and spin-selective, the functional impact of chirality-induced spin selectivity in live cultures remains unknown. Here, we show that a magnetic field enhances current in live S. oneidensis. EET to non-magnetic electrodes increased by [~]70 %, whereas electron uptake was insensitive to magnetic field. In contrast, electron uptake increased by >100 % when spin-polarised electrons were supplied from a magnetised electrode. This directional response suggests that magnetic field improves spin matching in the EET conduit, but only when the incoming electron flux is spin-polarised, implying that metabolic electrons are already spin-polarised before entering the conduit. Cytochromes in the conduit were downregulated despite higher current, indicating enhanced EET efficiency.

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Kathait, K., Mishra, R., Doyle, L. E.. 2026-06-16. Magnetic field enables spin matching in spin-selective pathways to enhance current in bacteria. https://doi.org/10.64898/2026.06.16.732578

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