Enhanced photo-bioelectrochemical energy conversion by genetically engineered cyanobacteria

Biotechnology and Bioengineering
Narendran SekarRamaraja P Ramasamy

Abstract

Photosynthetic energy conversion using natural systems is increasingly being investigated in the recent years. Photosynthetic microorganisms, such as cyanobacteria, exhibit light-dependent electrogenic characteristics in photo-bioelectrochemical cells (PBEC) that generate substantial photocurrents, yet the current densities are lower than their photovoltaic counterparts. Recently, we demonstrated that a cyanobacterium named Nostoc sp. employed in PBEC could generate up to 35 mW m(-2) even in a non-engineered PBEC. With the insights obtained from our previous research, a novel and successful attempt has been made in the current study to genetically engineer the cyanobacteria to further enhance its extracellular electron transfer. The cyanobacterium Synechococcus elongatus PCC 7942 was genetically engineered to express a non-native redox protein called outer membrane cytochrome S (OmcS). OmcS is predominantly responsible for metal reducing abilities of exoelectrogens such as Geobacter sp. The engineered S. elongatus exhibited higher extracellular electron transfer ability resulting in approximately ninefold higher photocurrent generation on the anode of a PBEC than the corresponding wild-type cyanobacterium. This work highlights ...Continue Reading

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Citations

Feb 15, 2017·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Kenya TanakaShuji Nakanishi
Jan 10, 2018·Biotechnology and Bioengineering·Narendran SekarRamaraja P Ramasamy
Feb 22, 2017·Biotechnology and Bioengineering·Narendran SekarRamaraja P Ramasamy
Oct 16, 2019·Biotechnology and Bioengineering·Mor CohenLital Alfonta
Dec 24, 2019·ChemElectroChem·Laura T WeyChristopher J Howe
Feb 14, 2020·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Matteo Grattieri
May 23, 2019·Frontiers in Microbiology·Jenny TschörtnerJens O Krömer
Jul 12, 2017·Energy & Environmental Science·N SchuergersA A Boghossian
Jun 25, 2020·Chemical Communications : Chem Comm·Matteo GrattieriShelley D Minteer
Sep 16, 2017·Journal of the American Chemical Society·Jenny Z ZhangErwin Reisner
Nov 8, 2018·Nano Letters·Sudeep JoshiManu S Mannoor
Sep 23, 2021·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·N Samali WeliwatteShelley D Minteer
Dec 6, 2021·Biosensors & Bioelectronics·Yaniv ShlosbergNoam Adir

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