Print Email Facebook Twitter Nicotinamide adenine dinucleotide as a photocatalyst Title Nicotinamide adenine dinucleotide as a photocatalyst Author Kim, Jinhyun (Korea Advanced Institute of Science and Technology) Lee, Sahng Ha (Korea Advanced Institute of Science and Technology) Tieves, F. (TU Delft BT/Biocatalysis) Paul, C.E. (TU Delft BT/Biocatalysis) Hollmann, F. (TU Delft BT/Biocatalysis) Park, Chan Beum (Korea Advanced Institute of Science and Technology) Date 2019 Abstract Nicotinamide adenine dinucleotide (NAD+) is a key redox compound in all living cells responsible for energy transduction, genomic integrity, life-span extension, and neuromodulation. Here, we report a new function of NAD+ as a molecular photocatalyst in addition to the biological roles. Our spectroscopic and electrochemical analyses reveal light absorption and electronic properties of two p-conjugated systems of NAD+. Furthermore, NAD+ exhibits a robust photostability under UV-Vis-NIR irradiation. We demonstrate photocatalytic redox reactions driven by NAD+, such as O2 reduction, H2O oxidation, and the formation of metallic nanoparticles. Beyond the traditional role of NAD+ as a cofactor in redox biocatalysis, NAD+ executes direct photoactivation of oxidoreductases through the reduction of enzyme prosthetic groups. Consequently, the synergetic integration of biocatalysis and photocatalysis using NAD+ enables solar-to-chemical conversion with the highest-ever-recorded turnover frequency and total turnover number of 1263.4 hour−1 and 1692.3, respectively, for light-driven biocatalytic trans-hydrogenation. To reference this document use: http://resolver.tudelft.nl/uuid:4392ea3a-d938-4841-8e48-35671142d2b6 DOI https://doi.org/10.1126/sciadv.aax0501 ISSN 2375-2548 Source Science Advances, 5 (7) Part of collection Institutional Repository Document type journal article Rights © 2019 Jinhyun Kim, Sahng Ha Lee, F. Tieves, C.E. Paul, F. Hollmann, Chan Beum Park Files PDF eaax0501.full.pdf 972.15 KB Close viewer /islandora/object/uuid:4392ea3a-d938-4841-8e48-35671142d2b6/datastream/OBJ/view