The acronym for ribulose bisphosphate carboxylase or oxygenase enzyme is rubisco enzyme. Rubisco enzyme is the most important enzyme in the world. These enzymes create chemical bonds between the natural world and living organisms. Hence it is called a bridge or bonding enzyme. 50% or more of the total protein in leaves is rubisco enzyme. The amount of rubisco enzyme in the world is about 40 million tons. With the help of this enzyme, 100 billion tons of CO2 are converted into carbohydrates every year on earth.