Journal
PROTEIN ENGINEERING DESIGN & SELECTION
Volume 17, Issue 7, Pages 595-602Publisher
OXFORD UNIV PRESS
DOI: 10.1093/protein/gzh068
Keywords
directed evolution; intein; methodology; protein engineering; selection
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Reading frame selection of nucleic acids has important implications for protein engineering and genomics. Current methods are limited because selection of the gene of interest inevitably depends on the solubility of its translated product. Here we report the construction of the pInSALect vector, which provides strict reading frame selection without concomitant selection for protein solubility or folding. This plasmid incorporates the cis-splicing VMA intein sequence from Saccharomyces cerevisiae to facilitate the post-translational self-excision of the protein of interest, thereby eliminating potential aggregation problems. Results from two libraries of chimeric glycinamide ribonucleotide formyltransferases confirm the superior performance of pInSALect over existing reading frame selection systems.
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