ENZYME LIMITS. “Take the protein Rubisco, of central importance in photosynthesis where as a carboxylase it acts as the enzyme central to the fixation of carbon. Yet, as is well-known, its rate of activity is cripplingly slow, explaining why it is the most abundant protein on the planet. It is difficult to think of an example where even a modest improvement in efficiency would not be adaptively highly significant, yet the only solution appears to be by rampantly convergent methods of carbon dioxide concentration, be they by carboxysomes.”
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