Evolution by leaps: gene duplication in bacteria.

Biology Direct
Margrethe H SerresMonica Riley

Abstract

Sequence related families of genes and proteins are common in bacterial genomes. In Escherichia coli they constitute over half of the genome. The presence of families and superfamilies of proteins suggest a history of gene duplication and divergence during evolution. Genome encoded protein families, their size and functional composition, reflect metabolic potentials of the organisms they are found in. Comparing protein families of different organisms give insight into functional differences and similarities. Equivalent enzyme families with metabolic functions were selected from the genomes of four experimentally characterized bacteria belonging to separate genera. Both similarities and differences were detected in the protein family memberships, with more similarities being detected among the more closely related organisms. Protein family memberships reflected known metabolic characteristics of the organisms. Differences in divergence of functionally characterized enzyme family members accounted for characteristics of taxa known to differ in those biochemical properties and capabilities. While some members of the gene families will have been acquired by lateral exchange and other former family members will have been lost over t...Continue Reading

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Software Mentioned

AllAllDb
blastp
MagicFit
PSI
rbs
ClustalW
Swiss
PSIBLAST
Darwin ( Data Analysis and Retrieval With Indexed Nucleotide /...
BLAST

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