Publication date: 8th October 2020
Inorganic-biological hybrids which combine synthetic light-harvesting nanoparticles and biocatalysts show great potential to harvest solar energy for chemicals and fuels production in a sustainable way. [1,2] Inspired by natural photosynthesis, we aim to provide proof-of-principle for whole-cell biohybrid photocatalysis producing value-added chemicals from coupled redox transformations within Gram-negative bacterium Shewanella oneidensis MR-1 (MR-1). A decaheme protein complex MtrC provides a direct conduit for bidirectional electron exchange across the MR-1 outer membrane. Single point mutations were performed to prepare Cys variants of MtrC which can be selectively labelled with light-harvesting electrocatalysts at different distances to heme. The activities of redox enzymes inside Gram-negative Shewanella bacteria will be directly coupled to the activities of extracellular photocatalysts by rational labelling of MtrC to deliver simultaneous production of intra- and extra-cellular chemicals in closed redox cycles. This work will provide a platform to perform complex, coupled light-driven transformations in oxidation and reduction for the first time.
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