Background: Hypothetical natural split inteins from environmental metagenomic sources were evaluated experimentally for the first time. Results: Four inteins showed the highest known reaction rates and efficiencies for protein trans-splicing and could be used efficiently for C-cleavage. Conclusion: These inteins pushed the catalytic limit of protein trans-splicing, although this was unpredictable from their primary sequence. Significance: These inteins hold great potential as versatile protein engineering tools.
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Carvajal-Vallejos et al. (2012) studied this question.
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