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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

A combinatorial approach to hybrid enzymes independent of DNA homology.

We present a methodology, termed incremental truncation for the creation of hybrid enzymes (ITCHY), that creates combinatorial fusion libraries between genes in a manner that is independent of DNA homology. We compared the ability of ITCHY and DNA shuffling to create interspecies fusion libraries between fragments of the Escherichia coli and human glycinamide ribonucleotide transformylase genes, which have only 50% identity on the DNA level. Sequencing of several randomly selected positives from each library illustrated that ITCHY identified a more diverse set of active fusion points including those in regions of nonhomology and those with crossover points that diverged from the sequence alignment. Furthermore, some of the hybrids found by ITCHY that were fused at nonhomologous locations had activities that were greater than or equal to the activity of the hybrids found by DNA shuffling.[1]


  1. A combinatorial approach to hybrid enzymes independent of DNA homology. Ostermeier, M., Shim, J.H., Benkovic, S.J. Nat. Biotechnol. (1999) [Pubmed]
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