Evolution of the structure of ferredoxin based on living relics of primitive amino Acid sequences
- PMID: 17775169
- DOI: 10.1126/science.152.3720.363
Evolution of the structure of ferredoxin based on living relics of primitive amino Acid sequences
Abstract
The structure of present-day ferredoxin, with its simple, inorganic active site and its functions basic to photon-energy utilization, suggests the incorporation of its prototype into metabolism very early during biochemical evolution, even before complex proteins and the complete modern genetic code existed. The information in the amino acid sequence of ferredoxin enables us to propose a detailed reconstruction of its evolutionary history. Ferredoxin has evolved by doubling a shorter protein, which may have contained only eight of the simplest amino acids. This shorter ancestor in turn developed from a repeating sequence of the amino acids alanine, aspartic acid or proline, serine, and glycine. We explain the persistence of living relics of this primordial structure by invoking a conservative principle in evolutionary biochemistry: The processes of natural selection severely inhibit any change a well-adapted system on which several other essential components depend.
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