Rubisco enzymatic activity in S. cerevisiae strains expressing different synthetic constructs. Specific ribulose-1,5-bisphosphate carboxylase (Rubisco) activity in cell extracts of S. cerevisiae expressing Rubisco form II CbbM from T. denitrificans, either alone (IMC033) or in combination with the E. coli chaperones GroEL/GroES  (IMC035), the T. denitrificans chaperones CbbO2/CbbQ2  (IMC034) or all four chaperones (IMC014). Heterologously expressed genes were codon optimised for expression in yeast and expressed from a single centromeric vector. Biomass samples were taken from anaerobic batch cultures on synthetic media (pH 5.0, 30°C), sparged with nitrogen and containing 20 g l-1 glucose as carbon source. Rubisco activities, measured as 14CO2-fixation in cell extracts, in a wild-type reference strain and in S. cerevisiae strains expressing cbbM and cbbM-cbbQ2-cbbO2 were below the detection limit of the enzyme assay (0.2 nmol CO2 min-1 mg protein-1).