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Plug and Play Photosynthesis: the photosynthetic extracellular electrogenic pathway

Plug and Play Photosynthesis: the photosynthetic extracellular electrogenic pathway. Andy Hitchcock and Tom Bibby. Can we harness excess potential to drive biofuel synthesis, electricity generation, the production of high value products?

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Plug and Play Photosynthesis: the photosynthetic extracellular electrogenic pathway

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  1. Plug and Play Photosynthesis: the photosynthetic extracellular electrogenicpathway Andy Hitchcock and Tom Bibby

  2. Can we harness excess potential to drive biofuel synthesis, electricity generation, the production of high value products? • Photosynthetic organisms show a light dependent electrogenic response, i.e. produce a current under illumination. • (Zouet al. 2009; Pisciottaet al. 2010; 2011; Bombelliet al. • 2011; McCormick et al. 2011). • Aim of project is to characterise the electron transfer pathway(s) from water splitting to extracellular electron acceptors. • Using model photosynthetic cyanobacteria • Synechocystis sp. PCC 6803. • GMOs, photosynthetic/respiratory • physiology, electrochemistry, synthetic • biology, omics approaches.

  3. EXTRACELLULAR ELECTRON ACCEPTOR Soluble shuttles PILI MTR Outer membrane Periplasm Cytoplasmic membrane RESPIRATION e.g. Geobacter, Shewenella ??? Cytoplasm PHOTOSYNTHESIS AND RESPIRATION Thylakoid membrane Thylakoid lumen

  4. PROGRESS: • 20+ knockout mutants • Indicative reduction assay • Controls • Mapping respiratory and PS contributions • Optimizing dye-based and electrochemical screens Extracellular electron acceptor (e.g. an anode) Electron flow Ox Red Outer membrane Periplasm cC Cytoplasmic membrane PQ pool RTO Cyt b6f RESPIRATION Resp DHs ? ??? Calvin cycle NADPH Flv2 Flv4 FNR H2 O2 Resp DHs Fd Cytoplasm PSII PSI PQ pool Cyt b6f RTO PHOTOSYNTHESIS AND RESPIRATION Thylakoid membrane PC cC6 H2O splitting Thylakoid lumen

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