Supporting Information Title Exploiting day- and night-time metabolism of Synechocystis sp. PCC 6803 for fitness-coupled fumarate production around the clock. Authors Wei Du †# , Joeri A. Jongbloets †# , Max Guillaume † , Bram van de Putte † , Beatrice Battaglino ‡§ , Klaas J. Hellingwerf † and Filipe Branco dos Santos † * Institution addresses † Molecular Microbial Physiology Group, Faculty of Life Sciences, Swammerdam Institute of Life Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands. ‡ Applied Science and Technology Department, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy § Centre for Sustainable Future Technologies, Istituto Italiano di Tecnologia, Environment Park, Via Livorno 60, 10144 Torino, Italy Corresponding author Filipe Branco dos Santos f.brancodossantos@uva.nl Author contributions # These authors contributed equally to this work.