Extended Data Fig. 1: R. rubrum rubisco structure.

Left, Overall structure of the 2-large subunit (L2) homodimer with active sites and C2-symmetry axis labelled with a black two-fold axis symbol- . (PDB: 9RUB). Centre, Ribbon diagram of one monomer with the 3 subdomains labelled. View is of the interfacial side. Right, Close-up view of the active site. Closed form of loop 6 is from the 8RUC structure. Active site residues and RuBP substrate are labelled.