Impairing photorespiration increases photosynthetic conversion of CO2 to isoprene in engineered cyanobacteria

Jie Zhou, Fan Yang, Fuliang Zhang, Hengkai Meng, Yanping Zhang, Yin Li
2021 Bioresources and Bioprocessing  
Photorespiration consumes fixed carbon and energy generated from photosynthesis to recycle glycolate and dissipate excess energy. The aim of this study was to investigate whether we can use the energy that is otherwise consumed by photorespiration to improve the production of chemicals which requires energy input. To this end, we designed and introduced an isoprene synthetic pathway, which requires ATP and NADPH input, into the cyanobacterium Synechocystis sp. 6803. We then deleted the glcD1
more » ... eleted the glcD1 and glcD2 genes which encode glycolate dehydrogenase to impair photorespiration in isoprene-producing strain of Synechocystis. Production of isoprene in glcD1/glcD2 disrupted strain doubled, and stoichiometric analysis indicated that the energy saved from the impaired photorespiration was redirected to increase production of isoprene. Thus, we demonstrate we can use the energy consumed by photorespiration of cyanobacteria to increase the energy-dependent production of chemicals from CO2.
doi:10.1186/s40643-021-00398-y doaj:8c58836911c64c2986fee3541c4549b4 fatcat:3w64c6aw2fflzij2ncqnqhzi4u