A novel transposon for functional expression of DNA libraries

Environmental DNA libraries are important sources for novel biocatalyst genes but activity screening for relevant enzymes is often inefficient. Therefore, we have constructed the transposon MuExpress which randomly integrates in vitro into existing bacterial artificial chromosome (BAC) or cosmid libraries and permits the inducible expression of its flanking regions in both directions. Furthermore, this transposon allows the bidirectional sequencing of the respective clones starting from unique primer binding sites.