||Robert H. Wilson, Spencer M. Whitney, Improving CO2 Fixation by Enhancing Rubisco Performance, 15 February 2017, Directed Enzyme Evolution: Advances and Applications, pp 101-126 p.102 top paragraph
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||P.102 top paragraph: "In plants and algae the carboxylation reaction of Rubisco occurs at a slow pace (~1–5 cycles per second) resulting in its catalytic properties often limiting the
rate of photosynthesis and growth in these organisms [primary source 9, ref 45]. To compensate for this shortcoming, many photosynthetic organisms require high amounts of Rubisco to meet their metabolic needs. For example, Rubisco can comprise up to 50% of the soluble protein in rice and wheat leaves [primary sources]. This high investment in Rubisco is therefore critical to supporting primary productivity in the global food chain which results in it being the most abundant enzyme on Earth [ref 16]."