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Affinity selection of DNA-binding proteins from yeast genomic DNA libraries by improved lambda phage display vector.

Phage display is a useful means of identifying and selecting proteins of interest that bind specific targets. In order to examine the potential of phage display for the genome-wide screening of DNA-binding proteins, we constructed yeast genomic libraries using lambda foo-based vectors devised in this work. After affinity selection using GAL4 UAS(G) as a probe, phages expressing GAL4 were enriched approximately 5 x 10(5)-fold from the library. Approximately 90% of polypeptides encoded in correct translation reading frames by the selected phages were known or putative polynucleotide-binding proteins. This result clearly indicates that the modified lambda phage display vector in combination with our enrichment technique has great potential for the enrichment of DNA-binding proteins in a sequence-specific manner.