Ribulose-1,5-bisphosphate carboxylase oxygenase, commonly known by the abbreviation RuBisCO, is an enzyme involved in the first major step of carbon fixation, a process by which atmospheric carbon dioxide is converted by plants to energy-rich molecules such as glucose. In chemical terms, it catalyzes the carboxylation of ribulose-1,5-bisphosphate (also known as RuBP). It is probably the most abundant protein on Earth.
Read more about RuBisCO: RuBisCO Vs Alternative Carbon Fixation Pathways, Structure, Enzymatic Activity, Regulation of Its Enzymatic Activity, Genetic Engineering, History of The Term RuBisCO