Evolution of catalytic proteins or on the origin of enzyme species by means of natural selection.

Abstract

It is believed that all present-day organisms descended from a common cellular ancestor. Such a cell must have evolved from more primitive and simpler precursors, but neither their organization nor the route such evolution took are accessible to the molecular techniques available today. We propose a mechanism, based on functional properties of enzymes and the kinetics of growth, which allows us to reconstruct the general course of early enzyme evolution. A precursor cell containing very few multifunctional enzymes with low catalytic activities is shown to lead inevitably to descendants with a large number of differentiated monofunctional enzymes with high turnover numbers. Mutation and natural selection for faster growth are shown to be the only conditions necessary for such a change to have occurred.

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@article{Kacser1984EvolutionOC, title={Evolution of catalytic proteins or on the origin of enzyme species by means of natural selection.}, author={Henrik Kacser and Richard Beeby}, journal={Journal of molecular evolution}, year={1984}, volume={20 1}, pages={38-51} }