Rubiso action                  
Ribulose 1,5-bisphosphate carboxylase-oxygenase

is the enzyme of Calvin cycle plants and accounts for 50% of soluble leaf protein in C3 plants. Made with 2 subunits   (L = 55K MW & S = 10K MW). Rubisco has 32 subunits in all of 8L dimers and 8S dimers with a MW of 540,000.