What Is the Most Abundant Enzyme in the Biosphere?

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Ribulose 15 bisphosphate carboxylase oxygenase is the most abundant enzyme in the biosphere. Find out about the most abundant enzyme in the biosphere with help from an experienced chemistry professional in this free video clip.

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Video Transcript

Hi, I'm Dan Weisenberger, and this is what is the most abundant enzyme in the biosphere? Well there is one enzyme that is above an beyond the rest when it comes to its presence in the earth's biosphere, and that is an enzyme called ribulose 15 bisphosphate carboxylase oxygenase, which is a lot to say in one, in one breath, so we'll refer to it as robisco, and robisco is abundant beyond any other protein on earth. It represents 50 percent of the plant protein biomass in C3 plants and 30 percent of the total protein plant biomass in C5 plants, and it catalyzes one very specific reaction shown here, which is the conversion of ribulose 15 bisphosphate with carbon dioxide into two copies of three phosphoglycerate, which is then converted to glyceraldehyde 3-phosphate. This product is very important in generating down the line and further biochemical pathways and generating glucose, sucrose and starch, which is a complex sugar that is used in storage. And this would not be possible without the efforts of one enzyme called robisco. I'm Dan Weisenberger, and this is what is the most abundant enzyme in the biosphere.


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