FIGURE 2.

A, superimposed large subunit monomers from R. palustris (chain A; red) and R. rubrum form II Rubiscos (Protein Data Bank code 9RUB; chain A; green). The CABP (red) and Mg²⁺ ion (cyan) shown in the figure are from the R. palustris structure, and the RuBP (green) is from the R. rubrum structure. Amino (Nt) and carboxyl termini (Ct) are indicated. B, stereoview of the secondary structure elements (α helices, red; β strands, yellow; loops and termini, gray) in the structure of R. palustris Rubisco (chain A) with CABP and the Mg²⁺ ion (cyan).