PMID:12618373

Citation	Peregrin-Alvarez, JM, Tsoka, S and Ouzounis, CA (2003) The phylogenetic extent of metabolic enzymes and pathways. Genome Res. 13:422-7
Abstract	The evolution of metabolic enzymes and pathways has been a subject of intense study for more than half a century. Yet, so far, previous studies have focused on a small number of enzyme families or biochemical pathways. Here, we examine the phylogenetic distribution of the full-known metabolic complement of Escherichia coli, using sequence comparison against taxa-specific databases. Half of the metabolic enzymes have homologs in all domains of life, representing families involved in some of the most fundamental cellular processes. We thus show for the first time and in a comprehensive way that metabolism is conserved at the enzyme level. In addition, our analysis suggests that despite the sequence conservation and the extensive phylogenetic distribution of metabolic enzymes, their groupings into biochemical pathways are much more variable than previously thought.
Links	PubMed PMC430287 Online version:10.1101/gr.246903
Keywords	Animals; Archaea/enzymology; Archaea/genetics; Enzymes/genetics; Enzymes/metabolism; Escherichia coli/enzymology; Eukaryota/enzymology; Eukaryota/genetics; Evolution, Molecular; Fungi/enzymology; Fungi/genetics; Phylogeny; Viruses/enzymology; Viruses/genetics
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