Despite slow catalysis and confused substrate specificity, all ribulose bisphosphate carboxylases may be nearly perfectly optimized.

Proceedings of the National Academy of Sciences of the United States of America
Guillaume G B TcherkezT John Andrews

Abstract

The cornerstone of autotrophy, the CO(2)-fixing enzyme, d-ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco), is hamstrung by slow catalysis and confusion between CO(2) and O(2) as substrates, an "abominably perplexing" puzzle, in Darwin's parlance. Here we argue that these characteristics stem from difficulty in binding the featureless CO(2) molecule, which forces specificity for the gaseous substrate to be determined largely or completely in the transition state. We hypothesize that natural selection for greater CO(2)/O(2) specificity, in response to reducing atmospheric CO(2):O(2) ratios, has resulted in a transition state for CO(2) addition in which the CO(2) moiety closely resembles a carboxylate group. This maximizes the structural difference between the transition states for carboxylation and the competing oxygenation, allowing better differentiation between them. However, increasing structural similarity between the carboxylation transition state and its carboxyketone product exposes the carboxyketone to the strong binding required to stabilize the transition state and causes the carboxyketone intermediate to bind so tightly that its cleavage to products is slowed. We assert that all Rubiscos may be nearly perfec...Continue Reading

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